多年iOS开发经验总结（转）

1、禁止手机睡眠

[UIApplication sharedApplication].idleTimerDisabled = YES;

2、隐藏某行cell

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

// 如果是你需要隐藏的那一行，返回高度为0

if(indexPath.row == YouWantToHideRow)

return0;

return44;

}

// 然后再你需要隐藏cell的时候调用

[self.tableView beginUpdates];

[self.tableView endUpdates];

3、禁用button高亮

button.adjustsImageWhenHighlighted = NO;

或者在创建的时候

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

4、tableview遇到这种报错failed to obtain a cell from its dataSource

是因为你的cell被调用的早了。先循环使用了cell，后又创建cell。顺序错了

可能原因：1、xib的cell没有注册 2、内存中已经有这个cell的缓存了(也就是说通过你的cellId找到的cell并不是你想要的类型)，这时候需要改下cell的标识

5、cocoa pods报这个错误：unable to access ‘https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received

解决办法：原因可能是网络问题，网络请求超时了，只需要重试就行了

6、cocoa pods 出现ERROR: While executing gem ... (Errno::EPERM)

解决办法：

https://segmentfault.com/q/1010000002926243

7、动画切换window的根控制器

// options是动画选项

[UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{

BOOL oldState = [UIView areAnimationsEnabled];

[UIView setAnimationsEnabled:NO];

[UIApplication sharedApplication].keyWindow.rootViewController = [RootViewControllernew];

[UIView setAnimationsEnabled:oldState];

} completion:^(BOOL finished) {

}];

8、去除数组中重复的对象

NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];

9、编译的时候遇到 no such file or directory: ／users／apple／XXX

是因为编译的时候，在此路径下找不到这个文件，解决这个问题，首先是是要检查缺少的文件是不是在工程中，如果不在工程中，需要从本地拖进去，如果发现已经存在工程中了，或者拖进去还是报错，这时候需要去build phases中搜索这个文件，这时候很可能会搜出现两个相同的文件，这时候，有一个路径是正确的，删除另外一个即可。如果删除了还是不行，需要把两个都删掉，然后重新往工程里拖进这个文件即可

10、iOS8系统中，tableView最好实现下-tableView: heightForRowAtIndexPath:这个代理方法，要不然在iOS8中可能就会出现显示不全或者无法响应事件的问题

11、iOS8中实现侧滑功能的时候这个方法必须实现，要不然在iOS8中无法侧滑

// 必须写的方法，和editActionsForRowAtIndexPath配对使用，里面什么不写也行

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

}

12、三个通知

NSSystemTimeZoneDidChangeNotification监听修改时间界面的两个按钮状态变化

UIApplicationSignificantTimeChangeNotification 监听用户改变时间（只要点击自动设置按钮就会调用） NSSystemClockDidChangeNotification 监听用户修改时间（时间不同才会调用）

13、SDWebImage本地缓存有时候会害人。如果之前缓存过一张图片，即使下次服务器换了这张图片，但是图片url没换，用sdwebimage下载下来的还是以前那张,所以遇到这种问题，不要先去怼服务器，清空下缓存再试就好了。

14、上线前注意：

1）、删掉代码中所有的测试代码

2）、如果后台有审核模式，提醒后台开启此模式

3）、主流程再跑一跑

4）、全局搜索waring，检查所有标记waring的地方

15、跳进app权限设置

／/ 跳进app设置

if(UIApplicationOpenSettingsURLString != NULL) {

NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];

[[UIApplication sharedApplication] openURL:url];

}

16、给一个view截图

UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);

[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

17、开发中如果要动态修改tableView的tableHeaderView或者tableFooterView的高度，需要给tableView重新设置，而不是直接更改高度。正确的做法是重新设置一下tableView.tableFooterView = 更改过高度的view。为什么？其实在iOS8以上直接改高度是没有问题的，在iOS8中出现了contentSize不准确的问题，这是解决办法。

18、注意对象为nil的时候，调用此对象分类的方法不会执行

19、collectionView的内容小于其宽高的时候是不能滚动的，设置可以滚动：

collectionView.alwaysBounceHorizontal = YES;

collectionView.alwaysBounceVertical = YES;

20、设置navigationBar上的title颜色和大小

[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]

21、颜色转图片

+(UIImage *)cl_imageWithColor:(UIColor *)color {

CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context, [color CGColor]);

CGContextFillRect(context, rect);

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnimage;

}

22、view设置圆角

#define ViewBorderRadius(View, Radius, Width, Color)\

[View.layer setCornerRadius:(Radius)];\

[View.layer setMasksToBounds:YES];\

[View.layer setBorderWidth:(Width)];\

[View.layer setBorderColor:[Color CGColor]]// view圆角

23、强／弱引用

2#define WeakSelf(type) __weak typeof(type) weak##type = type; // weak

#define StrongSelf(type) __strong typeof(type) type = weak##type; // strong

24、由角度转换弧度

#define DegreesToRadian(x) (M_PI * (x) / 180.0)

25、由弧度转换角度

#define RadianToDegrees(radian) (radian*180.0)/(M_PI)

26、获取图片资源

#define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]

27、获取temp

#define PathTemp NSTemporaryDirectory()

28、获取沙盒 Document

#define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]

29、获取沙盒 Cache

#define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

30、GCD代码只执行一次

#define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);

31、自定义NSLog

5#ifdef DEBUG

#define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)

#else

#define NSLog(...)

#endif

32、Font

5#define FontL(s) [UIFont systemFontOfSize:s weight:UIFontWeightLight]

#define FontR(s) [UIFont systemFontOfSize:s weight:UIFontWeightRegular]

#define FontB(s) [UIFont systemFontOfSize:s weight:UIFontWeightBold]

#define FontT(s) [UIFont systemFontOfSize:s weight:UIFontWeightThin]

#define Font(s) FontL(s)

33、FORMAT

#define FORMAT(f, ...) [NSString stringWithFormat:f, ## __VA_ARGS__]

34、在主线程上运行

#define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);

35、开启异步线程

#define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);

36、通知

3#define NOTIF_ADD(n, f) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil]

#define NOTIF_POST(n, o) [[NSNotificationCenter defaultCenter] postNotificationName:n object:o]

#define NOTIF_REMV() [[NSNotificationCenter defaultCenter] removeObserver:self]

37、随机颜色

7+ (UIColor *)RandomColor {

NSInteger aRedValue = arc4random() % 255;

NSInteger aGreenValue = arc4random() % 255;

NSInteger aBlueValue = arc4random() % 255;

UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];

returnrandColor;

}

38、获取window

12+(UIWindow*)getWindow {

UIWindow* win = nil;//[UIApplication sharedApplication].keyWindow;

for(id itemin[UIApplication sharedApplication].windows) {

if([item class] == [UIWindow class]) {

if(!((UIWindow*)item).hidden) {

win = item;

break;

}

returnwin;

}

39、修改textField的placeholder的字体颜色、大小

2[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];

[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];

40、统一收起键盘

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

41、控制屏幕旋转，在控制器中写

14/** 是否支持自动转屏 */

- (BOOL)shouldAutorotate {

returnYES;

}

/** 支持哪些屏幕方向 */

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {

returnUIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;

}

/** 默认的屏幕方向（当前ViewController必须是通过模态出来的UIViewController（模态带导航的无效）方式展现出来的，才会调用这个方法） */

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

returnUIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;

}

42、获取app缓存大小

19- (CGFloat)getCachSize {

NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];

//获取自定义缓存大小

//用枚举器遍历一个文件夹的内容

//1.获取文件夹枚举器

NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];

NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];

__block NSUInteger count = 0;

//2.遍历

for(NSString *fileNameinenumerator) {

NSString *path = [myCachePath stringByAppendingPathComponent:fileName];

NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];

count += fileDict.fileSize;//自定义所有缓存大小

}

// 得到是字节转化为M

CGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;

returntotalSize;

}

43、清理app缓存

11- (void)handleClearView {

//删除两部分

//1.删除 sd 图片缓存

//先清除内存中的图片缓存

[[SDImageCache sharedImageCache] clearMemory];

//清除磁盘的缓存

[[SDImageCache sharedImageCache] clearDisk];

//2.删除自己缓存

NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];

[[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];

}

44、模型转字典

57static NSSet *classes;

- (NSMutableDictionary *)getParameterDictionary {

NSMutableDictionary *dict = [NSMutableDictionary dictionary];

Class c = self.class;

while(c) {

unsigned count;

objc_property_t *properties = class_copyPropertyList([c class], &count);

for(int i = 0; i < count; i++) {

NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];

dict[key] = [self valueForKey:key];

}

free(properties);

// 获得父类

c = class_getSuperclass(c);

if([self isClassFromFoundation:c])break;

}

returndict;

}

- (BOOL)isClassFromFoundation:(Class)c

{

if(c == [NSObject class] || c == [NSManagedObject class])returnYES;

__block BOOL result = NO;

[[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {

if([c isSubclassOfClass:foundationClass]) {

result = YES;

*stop = YES;

}

}];

returnresult;

}

- (NSSet *)foundationClasses

{

if(classes == nil) {

// 集合中没有NSObject，因为几乎所有的类都是继承自NSObject，具体是不是NSObject需要特殊判断

classes = [NSSet setWithObjects:

[NSURL class],

[NSDate class],

[NSValue class],

[NSData class],

[NSError class],

[NSArray class],

[NSDictionary class],

[NSString class],

[NSAttributedString class], nil];

}

returnclasses;

}

45、交换两个方法实现

22Class aClass = [self class];

SEL originalSelector = @selector(viewWillAppear:);

SEL swizzledSelector = @selector(xxx_viewWillAppear:);

Method originalMethod = class_getInstanceMethod(aClass, originalSelector);

Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector);

BOOL didAddMethod =

class_addMethod(aClass,

originalSelector,

method_getImplementation(swizzledMethod),

method_getTypeEncoding(swizzledMethod));

if(didAddMethod) {

class_replaceMethod(aClass,

swizzledSelector,

method_getImplementation(originalMethod),

method_getTypeEncoding(originalMethod));

}else{

method_exchangeImplementations(originalMethod, swizzledMethod);

}

46、打印百分号和引号

2NSLog(@"%%");

NSLog(@"\"");

47、几个常用权限判断

17if([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {

NSLog(@"没有定位权限");

}

AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

if(statusVideo == AVAuthorizationStatusDenied) {

NSLog(@"没有摄像头权限");

}

//是否有麦克风权限

AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];

if(statusAudio == AVAuthorizationStatusDenied) {

NSLog(@"没有录音权限");

}

[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {

if(status == PHAuthorizationStatusDenied) {

NSLog(@"没有相册权限");

}

}];

48、获取手机型号

56+ (NSString *)getDeviceInfo {

struct utsname systemInfo;

uname(&systemInfo);

NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];

if([platform isEqualToString:@"iPhone1,1"])return@"iPhone 2G";

if([platform isEqualToString:@"iPhone1,2"])return@"iPhone 3G";

if([platform isEqualToString:@"iPhone2,1"])return@"iPhone 3GS";

if([platform isEqualToString:@"iPhone3,1"])return@"iPhone 4";

if([platform isEqualToString:@"iPhone3,2"])return@"iPhone 4";

if([platform isEqualToString:@"iPhone3,3"])return@"iPhone 4";

if([platform isEqualToString:@"iPhone4,1"])return@"iPhone 4S";

if([platform isEqualToString:@"iPhone5,1"])return@"iPhone 5";

if([platform isEqualToString:@"iPhone5,2"])return@"iPhone 5";

if([platform isEqualToString:@"iPhone5,3"])return@"iPhone 5c";

if([platform isEqualToString:@"iPhone5,4"])return@"iPhone 5c";

if([platform isEqualToString:@"iPhone6,1"])return@"iPhone 5s";

if([platform isEqualToString:@"iPhone6,2"])return@"iPhone 5s";

if([platform isEqualToString:@"iPhone7,1"])return@"iPhone 6 Plus";

if([platform isEqualToString:@"iPhone7,2"])return@"iPhone 6";

if([platform isEqualToString:@"iPhone8,1"])return@"iPhone 6s";

if([platform isEqualToString:@"iPhone8,2"])return@"iPhone 6s Plus";

// 日行两款手机型号均为日本独占，可能使用索尼FeliCa支付方案而不是苹果支付

if([platform isEqualToString:@"iPhone9,1"])return@"国行、日版、港行iPhone 7";

if([platform isEqualToString:@"iPhone9,2"])return@"港行、国行iPhone 7 Plus";

if([platform isEqualToString:@"iPhone9,3"])return@"美版、台版iPhone 7";

if([platform isEqualToString:@"iPhone9,4"])return@"美版、台版iPhone 7 Plus";

if([platform isEqualToString:@"iPhone8,4"])return@"iPhone SE";

if([platform isEqualToString:@"iPod1,1"])return@"iPod Touch 1G";

if([platform isEqualToString:@"iPod2,1"])return@"iPod Touch 2G";

if([platform isEqualToString:@"iPod3,1"])return@"iPod Touch 3G";

if([platform isEqualToString:@"iPod4,1"])return@"iPod Touch 4G";

if([platform isEqualToString:@"iPod5,1"])return@"iPod Touch 5G";

if([platform isEqualToString:@"iPad1,1"])return@"iPad 1G";

if([platform isEqualToString:@"iPad2,1"])return@"iPad 2";

if([platform isEqualToString:@"iPad2,2"])return@"iPad 2";

if([platform isEqualToString:@"iPad2,3"])return@"iPad 2";

if([platform isEqualToString:@"iPad2,4"])return@"iPad 2";

if([platform isEqualToString:@"iPad2,5"])return@"iPad Mini 1G";

if([platform isEqualToString:@"iPad2,6"])return@"iPad Mini 1G";

if([platform isEqualToString:@"iPad2,7"])return@"iPad Mini 1G";

if([platform isEqualToString:@"iPad3,1"])return@"iPad 3";

if([platform isEqualToString:@"iPad3,2"])return@"iPad 3";

if([platform isEqualToString:@"iPad3,3"])return@"iPad 3";

if([platform isEqualToString:@"iPad3,4"])return@"iPad 4";

if([platform isEqualToString:@"iPad3,5"])return@"iPad 4";

if([platform isEqualToString:@"iPad3,6"])return@"iPad 4";

if([platform isEqualToString:@"iPad4,1"])return@"iPad Air";

if([platform isEqualToString:@"iPad4,2"])return@"iPad Air";

if([platform isEqualToString:@"iPad4,3"])return@"iPad Air";

if([platform isEqualToString:@"iPad4,4"])return@"iPad Mini 2G";

if([platform isEqualToString:@"iPad4,5"])return@"iPad Mini 2G";

if([platform isEqualToString:@"iPad4,6"])return@"iPad Mini 2G";

if([platform isEqualToString:@"i386"])return@"iPhone Simulator";

if([platform isEqualToString:@"x86_64"])return@"iPhone Simulator";

returnplatform;

}

49、长按复制功能

10- (void)viewDidLoad

{

[self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];

}

- (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {

if(longPress.state == UIGestureRecognizerStateBegan) {

UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];

pasteboard.string = @"需要复制的文本";

}

50、cocoapods升级

在终端执行 sudo gem install -n / usr / local / bin cocoapods --pre

51、设置启动页后，依然显示之前的

删除app，手机重启，重新安装

52、判断图片类型

37//通过图片Data数据第一个字节来获取图片扩展名

- (NSString *)contentTypeForImageData:(NSData *)data

{

uint8_t c;

[data getBytes:&c length:1];

switch(c)

{

case0xFF:

return@"jpeg";

case0x89:

return@"png";

case0x47:

return@"gif";

case0x49:

case0x4D:

return@"tiff";

case0x52:

if([data length] < 12) {

returnnil;

}

NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];

if([testString hasPrefix:@"RIFF"]

&& [testString hasSuffix:@"WEBP"])

{

return@"webp";

}

returnnil;

}

returnnil;

}

53、获取手机和app信息

40NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

CFShow(infoDictionary);

// app名称

NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];

// app版本

NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

// app build版本

NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];

//手机序列号

NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];

NSLog(@"手机序列号: %@",identifierNumber);

//手机别名：用户定义的名称

NSString* userPhoneName = [[UIDevice currentDevice] name];

NSLog(@"手机别名: %@", userPhoneName);

//设备名称

NSString* deviceName = [[UIDevice currentDevice] systemName];

NSLog(@"设备名称: %@",deviceName );

//手机系统版本

NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];

NSLog(@"手机系统版本: %@", phoneVersion);

//手机型号

NSString* phoneModel = [[UIDevice currentDevice] model];

NSLog(@"手机型号: %@",phoneModel );

//地方型号（国际化区域名称）

NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];

NSLog(@"国际化区域名称: %@",localPhoneModel );

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

// 当前应用名称

NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"];

NSLog(@"当前应用名称：%@",appCurName);

// 当前应用软件版本比如：1.0.1

NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

NSLog(@"当前应用软件版本:%@",appCurVersion);

// 当前应用版本号码 int类型

NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"];

NSLog(@"当前应用版本号码：%@",appCurVersionNum);

54、获取一个类的所有属性

7id LenderClass = objc_getClass("Lender");

unsigned int outCount, i;

objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);

for(i = 0; i < outCount; i++) {

objc_property_t property = properties[i];

fprintf(stdout,"%s %s\n", property_getName(property), property_getAttributes(property));

}

55、image圆角

18- (UIImage *)circleImage

{

// NO代表透明

UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);

// 获得上下文

CGContextRef ctx = UIGraphicsGetCurrentContext();

// 添加一个圆

CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);

// 方形变圆形

CGContextAddEllipseInRect(ctx, rect);

// 裁剪

CGContextClip(ctx);

// 将图片画上去

[self drawInRect:rect];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnimage;

}

56、image拉伸

7+ (UIImage *)resizableImage:(NSString *)imageName

{

UIImage *image = [UIImage imageNamed:imageName];

CGFloat imageW = image.size.width;

CGFloat imageH = image.size.height;

return[image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch];

}

57、JSON字符串转字典

5+ (NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {

NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];

NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];

returnresponseJSON;

}

58、身份证号验证

10- (BOOL)validateIdentityCard {

BOOL flag;

if(self.length <= 0) {

flag = NO;

returnflag;

}

NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";

NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];

return[identityCardPredicate evaluateWithObject:self];

}

59、获取设备mac地址

43+ (NSString *)macAddress {

int mib[6];

size_t len;

char *buf;

unsigned char *ptr;

struct if_msghdr *ifm;

struct sockaddr_dl *sdl;

mib[0] = CTL_NET;

mib[1] = AF_ROUTE;

mib[2] = 0;

mib[3] = AF_LINK;

mib[4] = NET_RT_IFLIST;

if((mib[5] = if_nametoindex("en0")) == 0) {

printf("Error: if_nametoindex error\n");

returnNULL;

}

if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {

printf("Error: sysctl, take 1\n");

returnNULL;

}

if((buf = malloc(len)) == NULL) {

printf("Could not allocate memory. Rrror!\n");

returnNULL;

}

if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {

printf("Error: sysctl, take 2");

returnNULL;

}

ifm = (struct if_msghdr *)buf;

sdl = (struct sockaddr_dl *)(ifm + 1);

ptr = (unsigned char *)LLADDR(sdl);

NSString *outstring = [NSString stringWithFormat:@"X:X:X:X:X:X",

*ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];

free(buf);

returnoutstring;

}

60、导入自定义字体库

1、找到你想用的字体的 ttf 格式，拖入工程

2、在工程的plist中增加一行数组，“Fonts provided by application”

3、为这个key添加一个item，value为你刚才导入的ttf文件名

4、直接使用即可：label.font = [UIFont fontWithName:@"你刚才导入的ttf文件名" size:20.0]；

61、拿到当前正在显示的控制器，不管是push进去的，还是present进去的都能拿到

13- (UIViewController *)getVisibleViewControllerFrom:(UIViewController*)vc {

if([vc isKindOfClass:[UINavigationController class]]) {

return[self getVisibleViewControllerFrom:[((UINavigationController*) vc) visibleViewController]];

}elseif([vc isKindOfClass:[UITabBarController class]]){

return[self getVisibleViewControllerFrom:[((UITabBarController*) vc) selectedViewController]];

}else{

if(vc.presentedViewController) {

return[self getVisibleViewControllerFrom:vc.presentedViewController];

}else{

returnvc;

}

62、runtime为一个类动态添加属性

2// 动态添加属性的本质是: 让对象的某个属性与值产生关联

objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

63、获取runtime为一个类动态添加的属性

objc_getAssociatedObject(self, WZBPlaceholderViewKey);

64、KVO监听某个对象的属性

10// 添加监听者

[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];

// 当监听的属性值变化的时候会来到这个方法

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

if([keyPath isEqualToString:@"property"]) {

[self textViewTextChange];

}else{

}

65、Reachability判断网络状态

10NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];

if(status == NotReachable) {

NSLog(@"当前设备无网络");

}

if(status == ReachableViaWiFi) {

NSLog(@"当前wifi网络");

}

if(status == NotReachable) {

NSLog(@"当前蜂窝移动网络");

}

66、AFNetworking监听网络状态

21// 监听网络状况

AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];

[mgr setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

switch(status) {

caseAFNetworkReachabilityStatusUnknown:

break;

caseAFNetworkReachabilityStatusNotReachable: {

[SVProgressHUD showInfoWithStatus:@"当前设备无网络"];

}

break;

caseAFNetworkReachabilityStatusReachableViaWiFi:

[SVProgressHUD showInfoWithStatus:@"当前Wi-Fi网络"];

break;

caseAFNetworkReachabilityStatusReachableViaWWAN:

[SVProgressHUD showInfoWithStatus:@"当前蜂窝移动网络"];

break;

default:

break;

}

}];

[mgr startMonitoring];

67、透明颜色不影响子视图透明度

[UIColor colorWithRed: green: blue: alpha:];

68、取图片某一点的颜色

40if(point.x < 0 || point.y < 0)returnnil;

CGImageRef imageRef = self.CGImage;

NSUInteger width = CGImageGetWidth(imageRef);

NSUInteger height = CGImageGetHeight(imageRef);

if(point.x >= width || point.y >= height)returnnil;

unsigned char *rawData = malloc(height * width * 4);

if(!rawData)returnnil;

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

NSUInteger bytesPerPixel = 4;

NSUInteger bytesPerRow = bytesPerPixel * width;

NSUInteger bitsPerComponent = 8;

CGContextRef context = CGBitmapContextCreate(rawData,

width,

height,

bitsPerComponent,

bytesPerRow,

colorSpace,

kCGImageAlphaPremultipliedLast

| kCGBitmapByteOrder32Big);

if(!context) {

free(rawData);

returnnil;

}

CGColorSpaceRelease(colorSpace);

CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);

CGContextRelease(context);

int byteIndex = (bytesPerRow * point.y) + point.x * bytesPerPixel;

CGFloat red = (rawData[byteIndex] * 1.0) / 255.0;

CGFloat green = (rawData[byteIndex + 1] * 1.0) / 255.0;

CGFloat blue = (rawData[byteIndex + 2] * 1.0) / 255.0;

CGFloat alpha = (rawData[byteIndex + 3] * 1.0) / 255.0;

UIColor *result = nil;

result = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];

free(rawData);

returnresult;

69、判断该图片是否有透明度通道

8- (BOOL)hasAlphaChannel

{

CGImageAlphaInfo alpha = CGImageGetAlphaInfo(self.CGImage);

return(alpha == kCGImageAlphaFirst ||

alpha == kCGImageAlphaLast ||

alpha == kCGImageAlphaPremultipliedFirst ||

alpha == kCGImageAlphaPremultipliedLast);

}

70、获得灰度图

21+ (UIImage*)covertToGrayImageFromImage:(UIImage*)sourceImage

{

int width = sourceImage.size.width;

int height = sourceImage.size.height;

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();

CGContextRef context = CGBitmapContextCreate (nil,width,height,8,0,colorSpace,kCGImageAlphaNone);

CGColorSpaceRelease(colorSpace);

if(context == NULL) {

returnnil;

}

CGContextDrawImage(context,CGRectMake(0, 0, width, height), sourceImage.CGImage);

CGImageRef contextRef = CGBitmapContextCreateImage(context);

UIImage *grayImage = [UIImage imageWithCGImage:contextRef];

CGContextRelease(context);

CGImageRelease(contextRef);

returngrayImage;

}

71、根据bundle中的文件名读取图片

37+ (UIImage *)imageWithFileName:(NSString *)name {

NSString *extension = @"png";

NSArray *components = [name componentsSeparatedByString:@"."];

if([components count] >= 2) {

NSUInteger lastIndex = components.count - 1;

extension = [components objectAtIndex:lastIndex];

name = [name substringToIndex:(name.length-(extension.length+1))];

}

// 如果为Retina屏幕且存在对应图片，则返回Retina图片，否则查找普通图片

if([UIScreen mainScreen].scale == 2.0) {

name = [name stringByAppendingString:@"@2x"];

NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];

if(path != nil) {

return[UIImage imageWithContentsOfFile:path];

}

if([UIScreen mainScreen].scale == 3.0) {

name = [name stringByAppendingString:@"@3x"];

NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];

if(path != nil) {

return[UIImage imageWithContentsOfFile:path];

}

NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];

if(path) {

return[UIImage imageWithContentsOfFile:path];

}

returnnil;

}

72、合并两个图片

15+ (UIImage*)mergeImage:(UIImage*)firstImage withImage:(UIImage*)secondImage {

CGImageRef firstImageRef = firstImage.CGImage;

CGFloat firstWidth = CGImageGetWidth(firstImageRef);

CGFloat firstHeight = CGImageGetHeight(firstImageRef);

CGImageRef secondImageRef = secondImage.CGImage;

CGFloat secondWidth = CGImageGetWidth(secondImageRef);

CGFloat secondHeight = CGImageGetHeight(secondImageRef);

CGSize mergedSize = CGSizeMake(MAX(firstWidth, secondWidth), MAX(firstHeight, secondHeight));

UIGraphicsBeginImageContext(mergedSize);

[firstImage drawInRect:CGRectMake(0, 0, firstWidth, firstHeight)];

[secondImage drawInRect:CGRectMake(0, 0, secondWidth, secondHeight)];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnimage;

}

73、根据bundle中的图片名创建imageview

4+ (id)imageViewWithImageNamed:(NSString*)imageName

{

return[[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]];

}

74、为imageView添加倒影

23CGRect frame = self.frame;

frame.origin.y += (frame.size.height + 1);

UIImageView *reflectionImageView = [[UIImageView alloc] initWithFrame:frame];

self.clipsToBounds = TRUE;

reflectionImageView.contentMode = self.contentMode;

[reflectionImageView setImage:self.image];

reflectionImageView.transform = CGAffineTransformMakeScale(1.0, -1.0);

CALayer *reflectionLayer = [reflectionImageView layer];

CAGradientLayer *gradientLayer = [CAGradientLayer layer];

gradientLayer.bounds = reflectionLayer.bounds;

gradientLayer.position = CGPointMake(reflectionLayer.bounds.size.width / 2, reflectionLayer.bounds.size.height * 0.5);

gradientLayer.colors = [NSArray arrayWithObjects:

(id)[[UIColor clearColor] CGColor],

(id)[[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.3] CGColor], nil];

gradientLayer.startPoint = CGPointMake(0.5,0.5);

gradientLayer.endPoint = CGPointMake(0.5,1.0);

reflectionLayer.mask = gradientLayer;

[self.superview addSubview:reflectionImageView];

75、画水印

15// 画水印

- (void) setImage:(UIImage *)image withWaterMark:(UIImage *)mark inRect:(CGRect)rect

{

if([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)

{

UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, 0.0);

}

//原图

[image drawInRect:self.bounds];

//水印图

[mark drawInRect:rect];

UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

self.image = newPic;

}

76、让label的文字内容显示在左上／右上／左下／右下／中心顶／中心底部

50自定义UILabel

// 重写label的textRectForBounds方法

- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {

CGRect rect = [supertextRectForBounds:bounds limitedToNumberOfLines:numberOfLines];

switch(self.textAlignmentType) {

caseWZBTextAlignmentTypeLeftTop: {

rect.origin = bounds.origin;

}

break;

caseWZBTextAlignmentTypeRightTop: {

rect.origin = CGPointMake(CGRectGetMaxX(bounds) - rect.size.width, bounds.origin.y);

}

break;

caseWZBTextAlignmentTypeLeftBottom: {

rect.origin = CGPointMake(bounds.origin.x, CGRectGetMaxY(bounds) - rect.size.height);

}

break;

caseWZBTextAlignmentTypeRightBottom: {

rect.origin = CGPointMake(CGRectGetMaxX(bounds) - rect.size.width, CGRectGetMaxY(bounds) - rect.size.height);

}

break;

caseWZBTextAlignmentTypeTopCenter: {

rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, CGRectGetMaxY(bounds) - rect.origin.y);

}

break;

caseWZBTextAlignmentTypeBottomCenter: {

rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, CGRectGetMaxY(bounds) - CGRectGetMaxY(bounds) - rect.size.height);

}

break;

caseWZBTextAlignmentTypeLeft: {

rect.origin = CGPointMake(0, rect.origin.y);

}

break;

caseWZBTextAlignmentTypeRight: {

rect.origin = CGPointMake(rect.origin.x, 0);

}

break;

caseWZBTextAlignmentTypeCenter: {

rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, (CGRectGetHeight(bounds) - CGRectGetHeight(rect)) / 2);

}

break;

default:

break;

}

returnrect;

}

- (void)drawTextInRect:(CGRect)rect {

CGRect textRect = [self textRectForBounds:rect limitedToNumberOfLines:self.numberOfLines];

[superdrawTextInRect:textRect];

}

77、scrollView上的输入框，键盘挡住的问题

17推荐用IQKeyboardManager这个框架！

手动解决如下

1、监听键盘弹出／消失的通知

2、在通知中加入代码：

NSDictionary* info = [aNotification userInfo];

CGRect keyPadFrame=[[UIApplication sharedApplication].keyWindow convertRect:[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue] fromView:self.view];

CGSize kbSize =keyPadFrame.size;

CGRect activeRect=[self.view convertRect:activeField.frame fromView:activeField.superview];

CGRect aRect = self.view.bounds;

aRect.size.height -= (kbSize.height);

CGPoint origin = activeRect.origin;

origin.y -= backScrollView.contentOffset.y;

if(!CGRectContainsPoint(aRect, origin)) {

CGPoint scrollPoint = CGPointMake(0.0,CGRectGetMaxY(activeRect)-(aRect.size.height));

[backScrollView setContentOffset:scrollPoint animated:YES];

}

78、frame布局的cell动态高度

这种通常在你的模型中添加一个辅助属性cellHeight，在模型中重写这个属性的get方法，根据你的布局和模型中的其他属性值计算出总高度。最后在tableView：heightForRow方法中，根据indexPath找出对应的模型，返回这个高度即可。

79、AutoLayout布局的cell动态高度

4// 1、设置tableView的属性

self.tableView.rowHeight = UITableViewAutomaticDimension;

self.tableView.estimatedRowHeight = 44.0;// 这个属性非0，估计cell高度

// 2、至上而下设置cell的约束，注意，上下左右最好都要顶到cell的四周

cell

80、使用performSelector:调用函数，内存泄漏问题

当我们在开发中使用[obj performSelector:NSSelectorFromString(@"aMethod")];这类方法时可能会收到一个警告"performSelector may cause a leak because its selector is unknown".

是因为编译器不清楚这个对象能不能相应这个方法，如果不能，则是不安全的，而且编译器也不清楚该怎么处理这个方法的返回值！

10使用以下代码调用即可：

if(! obj) {return; }

SEL selector = NSSelectorFromString(@"aMethod");

IMP imp = [obj methodForSelector:selector];

void (*func)(id, SEL) = (void *)imp;

func(obj, selector);

或者：

SEL selector = NSSelectorFromString(@"aMethod");

((void (*)(id, SEL))[obj methodForSelector:selector])(obj, selector);

81、一个字符串是否包含另一个字符串

13// 方法1

if([str1 containsString:str2]) {

NSLog(@"str1包含str2");

}else{

NSLog(@"str1不包含str2");

}

// 方法2

if([str1 rangeOfString: str2].location == NSNotFound) {

NSLog(@"str1包含str2");

}else{

NSLog(@"str1不包含str2");

}

82、cell去除选中效果

cell.selectionStyle = UITableViewCellSelectionStyleNone;

83、cell点按效果

3- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

[tableView deselectRowAtIndexPath:indexPath animated:YES];

}

84、当删除一个从xib拖出来的属性时，一定记得把xib中对应的线也删掉，不然会报类似[setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key的crash

点击这个叉号删除

85、真机测试的时候报错：Could not launch "你的 App"，process launch failed: Security

因为你的app没有上线，iOS9开始，需要手动信任Xcode生成的描述文件，打开手机设置->通用->描述文件->点击你的app的描述文件->点击信任

86、真机测试的时候报错：Could not find Developer Disk Image

这是因为你的设备系统版本大于Xcode能兼容的系统版本，比如你的设备是iOS10.3，而Xcode版本是8.2（Xcode8.2最大兼容iOS10.2），就会报这个错误。解决办法就是升级Xcode！

87、UITextView没有placeholder的问题？

网上有很多此类自定义控件，也可以参考下我写的一个UITextView分类 UITextView-WZB

88、移除字符串中的空格和换行

6+ (NSString *)removeSpaceAndNewline:(NSString *)str {

NSString *temp = [str stringByReplacingOccurrencesOfString:@" "withString:@""];

temp = [temp stringByReplacingOccurrencesOfString:@"\r"withString:@""];

temp = [temp stringByReplacingOccurrencesOfString:@"\n"withString:@""];

returntemp;

}

89、判断字符串中是否有空格

10+ (BOOL)isBlank:(NSString *)str {

NSRange _range = [str rangeOfString:@" "];

if(_range.location != NSNotFound) {

//有空格

returnYES;

}else{

//没有空格

returnNO;

}

90、获取一个视频的第一帧图片

10NSURL *url = [NSURL URLWithString:filepath];

AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:url options:nil];

AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];

generate1.appliesPreferredTrackTransform = YES;

NSError *err = NULL;

CMTime time = CMTimeMake(1, 2);

CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];

UIImage *one = [[UIImage alloc] initWithCGImage:oneRef];

returnone;

91、获取视频的时长

7+ (NSInteger)getVideoTimeByUrlString:(NSString *)urlString {

NSURL *videoUrl = [NSURL URLWithString:urlString];

AVURLAsset *avUrl = [AVURLAsset assetWithURL:videoUrl];

CMTime time = [avUrl duration];

int seconds = ceil(time.value/time.timescale);

returnseconds;

}

92、字符串是否为空

3+ (BOOL)isEqualToNil:(NSString *)str {

returnstr.length <= 0 || [str isEqualToString:@""] || !str;

}

93、将app上传到App Store的时候通常会遇到这个问题

try again

很多人说这事苹果爸爸服务器问题，重复尝试几次，总会成功的！

但是经过尝试发现如果使用Application Loader上传成功率就非常高，所以还是推荐把ipa文件导出直接用Application Loader上传。

如果Application Loader也不行，需要检查下自己的网络，有时候vpn也会提高速度。

94、当tableView占不满一屏时，去除下边多余的单元格

2self.tableView.tableHeaderView = [UIViewnew];

self.tableView.tableFooterView = [UIViewnew];

95、isKindOfClass和isMemberOfClass的区别

2isKindOfClass可以判断某个对象是否属于某个类，或者这个类的子类。

isMemberOfClass更加精准，它只能判断这个对象类型是否为这个类(不能判断子类)

96、__block

当一个局部变量需要在block里改变时，需要在定义时加上__block修饰，具体请看官方文档http://developer.apple.com/library/ios/documentation/cocoa/Conceptual/Blocks/Articles/bxVariables.html#//apple_ref/doc/uid/TP40007502-CH6-SW6

97、-[ViewController aMethod:]: unrecognized selector sent to instance 0x7fe91e607fb0

这是一个经典错误，ViewController不能响应aMethod这个方法，错误原因可能viewController文件中没有实现aMethod这个方法

98、UITableView () failed to obtain a cell from its dataSource ()

这个错误原因是tableView的代理方法-tableView:cellForRowAtIndexPath:需要返回一个UITableViewCell,而你返回了一个nil。另外这个地方返回值不是UITableViewCell类型也会导致崩溃

99、约束如何做UIView动画？

1、把需要改的约束Constraint拖条线出来，成为属性

2、在需要动画的地方加入代码，改变此属性的constant属性

3、开始做UIView动画，动画里边调用layoutIfNeeded方法

5@property (weak, nonatomic) IBOutlet NSLayoutConstraint *buttonTopConstraint;

self.buttonTopConstraint.constant = 100;

[UIView animateWithDuration:.5 animations:^{

[self.view layoutIfNeeded];

}];

100、从NSURL中拿到链接字符串

NSString *urlString = myURL.absoluteString;

101、将tableView滚动到顶部

3[tableView setContentOffset:CGPointZero animated:YES];

或者

[tableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

102、如果用addTarget:action:forControlEvents:方法为一个button添加了很多点击事件，在某个时刻想一次删除怎么办？只需要调用下边这句代码

[youButton removeTarget:nil action:nil forControlEvents:UIControlEventAllEvents];

103、某个字体的高度

font.lineHeight;

104、删除某个view所有的子视图

2[[someView subviews]

makeObjectsPerformSelector:@selector(removeFromSuperview)];

105、删除NSUserDefaults所有记录

14//方法一

NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];

[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];

//方法二

- (void)resetDefaults {

NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];

NSDictionary * dict = [defs dictionaryRepresentation];

for(id keyindict) {

[defs removeObjectForKey:key];

}

[defs synchronize];

}

// 方法三

[[NSUserDefaults standardUserDefaults] setPersistentDomain:[NSDictionary dictionary] forName:[[NSBundle mainBundle] bundleIdentifier]];

106、禁用系统滑动返回功能

16- (void)viewDidAppear:(BOOL)animated

{

[superviewDidAppear:animated];

if([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = self;

}

- (void)viewWillDisappear:(BOOL)animated {

[superviewWillDisappear:animated];

if([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = nil;

}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

{

returnNO;

}

107、模拟器报错

模拟器报错

解决办法：

打开模拟器->Simulator->Reset Content and Settings...

如果不行，就重启试试！

108、自定义cell选中背景颜色

3UIView *bgColorView = [[UIView alloc] init];

bgColorView.backgroundColor = [UIColor redColor];

[cell setSelectedBackgroundView:bgColorView];

109、UILabel设置内边距

6子类化UILabel，重写drawTextInRect方法

- (void)drawTextInRect:(CGRect)rect {

// 边距，上左下右

UIEdgeInsets insets = {0, 5, 0, 5};

[superdrawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];

}

110、UILabel设置文字描边

16子类化UILabel，重写drawTextInRect方法

- (void)drawTextInRect:(CGRect)rect

{

CGContextRef c = UIGraphicsGetCurrentContext();

// 设置描边宽度

CGContextSetLineWidth(c, 1);

CGContextSetLineJoin(c, kCGLineJoinRound);

CGContextSetTextDrawingMode(c, kCGTextStroke);

// 描边颜色

self.textColor = [UIColor redColor];

[superdrawTextInRect:rect];

// 文本颜色

self.textColor = [UIColor yellowColor];

CGContextSetTextDrawingMode(c, kCGTextFill);

[superdrawTextInRect:rect];

}

111、使用模拟器截图

2快捷键command + s

或者File->Save Screen Shot

112、scrollView滚动到最下边

2CGPoint bottomOffset = CGPointMake(0, scrollView.contentSize.height - scrollView.bounds.size.height);

[scrollView setContentOffset:bottomOffset animated:YES];

113、UIView背景颜色渐变

6UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];

[self.view addSubview:view];

CAGradientLayer *gradient = [CAGradientLayer layer];

gradient.frame = view.bounds;

gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor blackColor] CGColor], (id)[[UIColor whiteColor] CGColor], nil];

[view.layer insertSublayer:gradient atIndex:0];

114、停止UIView动画

[yourView.layer removeAllAnimations]

115、为UIView某个角添加圆角

6// 左上角和右下角添加圆角

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(20, 20)];

CAShapeLayer *maskLayer = [CAShapeLayer layer];

maskLayer.frame = view.bounds;

maskLayer.path = maskPath.CGPath;

view.layer.mask = maskLayer;

116、删除Xcode Derived data缓存数据

依次点击Xcode -> Preferences -> location，然后点击 Derived data路径后到小箭头，删除这个文件夹下的数据就可以了，如图

Xcode Derived data

117、将一个view放置在其兄弟视图的最上面

[parentView bringSubviewToFront:yourView]

118、将一个view放置在其兄弟视图的最下面

[parentView sendSubviewToBack:yourView]

119、让手机震动一下

5倒入框架

#import

AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);

或者

AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

120、layoutSubviews方法什么时候调用？

1、init方法不会调用

2、addSubview方法等时候会调用

3、bounds改变的时候调用

4、scrollView滚动的时候会调用scrollView的layoutSubviews方法(所以不建议在scrollView的layoutSubviews方法中做复杂逻辑)

5、旋转设备的时候调用

6、子视图被移除的时候调用

参考请看：http://blog.logichigh.com/2011/03/16/when-does-layoutsubviews-get-called/

121、让UILabel在指定的地方换行

3// 换行符为\n,在需要换行的地方加上这个符号即可，如

label.numberOfLines = 0;

label.text = @"此处\n换行";

122、摇一摇功能

121、打开摇一摇功能

[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;

2、让需要摇动的控制器成为第一响应者

[self becomeFirstResponder];

3、实现以下方法

// 开始摇动

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event

// 取消摇动

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event

// 摇动结束

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event

123、获取图片大小

2CGFloat imageWidth = image.size.width;

CGFloat imageHeight = imageWidth * image.scale;

124、获取view的坐标在整个window上的位置

4// v上的(0, 0)点在toView上的位置

CGPoint point = [v convertPoint:CGPointMake(0, 0) toView:[UIApplication sharedApplication].windows.lastObject];

或者

CGPoint point = [v.superview convertPoint:v.frame.origin toView:[UIApplication sharedApplication].windows.lastObject];

125、提交App Store审核程序限制

您的应用程序的未压缩大小必须小于4GB。每个Mach-O可执行文件（例如app_name.app/app_name）不能超过这些限制：

对于MinimumOSVersion小于7.0的应用程序：TEXT二进制文件中所有部分的总数最多为80 MB 。

对于MinimumOSVersion7.x到8.x的应用程序：TEXT对于二进制文件中每个体系结构片段的每个片段，最大为60 MB 。

对于MinimumOSVersion9.0或更高版本的应用程序：__TEXT二进制文件中所有部分的总数最多为500 MB 。参阅：iTunes Connect开发者指南

126、修改UISegmentedControl的字体大小

[segment setTitleTextAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:15.0f]} forState:UIControlStateNormal];

127、在非ViewController的地方弹出UIAlertController对话框

13// 最好抽成一个分类

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Title"message:@"message"preferredStyle:UIAlertControllerStyleAlert];

//...

id rootViewController = [UIApplication sharedApplication].delegate.window.rootViewController;

if([rootViewController isKindOfClass:[UINavigationController class]])

{

rootViewController = ((UINavigationController *)rootViewController).viewControllers.firstObject;

}

if([rootViewController isKindOfClass:[UITabBarController class]])

{

rootViewController = ((UITabBarController *)rootViewController).selectedViewController;

}

[rootViewController presentViewController:alertController animated:YES completion:nil];

128、获取一个view所属的控制器

10// view分类方法

- (UIViewController *)belongViewController {

for(UIView *next = [self superview]; next; next = next.superview) {

UIResponder* nextResponder = [next nextResponder];

if([nextResponder isKindOfClass:[UIViewController class]]) {

return(UIViewController *)nextResponder;

}

returnnil;

}

129、UIImage和base64互转

9// view分类方法

- (NSString *)encodeToBase64String:(UIImage *)image {

return[UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

}

- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {

NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];

return[UIImage imageWithData:data];

}

130、UIWebView设置背景透明

2[webView setBackgroundColor:[UIColor clearColor]];

[webView setOpaque:NO];

131、判断NSDate是不是今天

8NSDateComponents *otherDay = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:aDate];

NSDateComponents *today = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:[NSDate date]];

if([today day] == [otherDay day] &&

[today month] == [otherDay month] &&

[today year] == [otherDay year] &&

[today era] == [otherDay era]) {

// 是今天

}

132、设置tableView分割线颜色

[self.tableView setSeparatorColor:[UIColor myColor]];

133、设置屏幕方向

[[UIDevice currentDevice] setValue:@(UIInterfaceOrientationLandscapeLeft) forKey:@"orientation"];

134、比较两个颜色是否相等

21- (BOOL)isEqualToColor:(UIColor *)otherColor {

CGColorSpaceRef colorSpaceRGB = CGColorSpaceCreateDeviceRGB();

UIColor *(^convertColorToRGBSpace)(UIColor*) = ^(UIColor *color) {

if(CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) == kCGColorSpaceModelMonochrome) {

const CGFloat *oldComponents = CGColorGetComponents(color.CGColor);

CGFloat components[4] = {oldComponents[0], oldComponents[0], oldComponents[0], oldComponents[1]};

CGColorRef colorRef = CGColorCreate( colorSpaceRGB, components );

UIColor *color = [UIColor colorWithCGColor:colorRef];

CGColorRelease(colorRef);

returncolor;

}else

returncolor;

};

UIColor *selfColor = convertColorToRGBSpace(self);

otherColor = convertColorToRGBSpace(otherColor);

CGColorSpaceRelease(colorSpaceRGB);

return[selfColor isEqual:otherColor];

}

135、tableViewCell分割线顶到头

10- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {

[cell setSeparatorInset:UIEdgeInsetsZero];

[cell setLayoutMargins:UIEdgeInsetsZero];

cell.preservesSuperviewLayoutMargins = NO;

}

- (void)viewDidLayoutSubviews {

[self.tableView setSeparatorInset:UIEdgeInsetsZero];

[self.tableView setLayoutMargins:UIEdgeInsetsZero];

}

136、不让控制器的view随着控制器的xib拉伸或压缩

self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

137、cocoaPods报错 : [!] Unable to add a source with url https://github.com/CocoaPods/Specs.git named master-1.

You can try adding it manually in ~/.cocoapods/repos or via pod repo add.

解决方法：这是因为电脑里安装了另外一个Xcode导致cocoapods找不到路径了

在终端执行 sudo xcode-select -switch /Applications/Xcode.app 即可

138、安装cocoapods的时候出现 ERROR: While executing gem ... (Errno::EPERM)

Operation not permitted - /usr/bin/pod

解决办法：直接在终端执行 sudo gem install -n /usr/local/bin cocoapods

139、在状态栏增加网络请求的菊花，类似safari加载网页的时候状态栏菊花

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

140、检查一个rect是否包含一个point

2// point是否在rect内

BOOL isContains = CGRectContainsPoint(rect, point);

141、在指定的宽度下，让UILabel自动设置最佳font

label.adjustsFontSizeToFitWidth = YES;

142、将一个image保存在相册中

14UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

或者

#import

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];

changeRequest.creationDate = [NSDate date];

} completionHandler:^(BOOL success, NSError *error) {

if(success) {

NSLog(@"successfully saved");

}

else{

NSLog(@"error saving to photos: %@", error);

}

}];

143、修改cell.imageView的大小

7UIImage *icon = [UIImage imageNamed:@""];

CGSize itemSize = CGSizeMake(30, 30);

UIGraphicsBeginImageContextWithOptions(itemSize, NO ,0.0);

CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);

[icon drawInRect:imageRect];

cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

144、为一个view添加虚线边框

／ / 继承UITextView重写这个方法

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender

{

// 返回NO为禁用，YES为开启

// 粘贴

if(action == @selector(paste:))returnNO;

// 剪切

if(action == @selector(cut:))returnNO;

// 复制

if(action == @selector(copy:))returnNO;

// 选择

if(action == @selector(select:))returnNO;

// 选中全部

if(action == @selector(selectAll:))returnNO;

// 删除

if(action == @selector(delete:))returnNO;

// 分享

if(action == @selector(share))returnNO;

return[supercanPerformAction:action withSender:sender];

}

最后编辑于：2017.12.08 08:11:45

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