一、修改电池导航栏颜色
021124078208620.png
二、调用代码使APP进入后台，达到点击Home键的效果。（私有API）
[[UIApplication sharedApplication] performSelector:@selector(suspend)];
三、修改textFieldplaceholder字体颜色和大小
textField.placeholder = @"请输入用户名";
[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
四、禁止textField和textView的复制粘贴菜单
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
if ([UIMenuController sharedMenuController]) {
[UIMenuController sharedMenuController].menuVisible = NO;
}
return NO;
}
五、测划事件
测划返回触发的系统方法
- (void)willMoveToParentViewController:(UIViewController*)parent{
[super willMoveToParentViewController:parent];
NSLog(@"%s,%@",__FUNCTION__,parent);
[self dismissKeyboard];
}
- (void)didMoveToParentViewController:(UIViewController*)parent{
[super didMoveToParentViewController:parent];
NSLog(@"%s,%@",__FUNCTION__,parent);
if(!parent){
NSLog(@"页面pop成功了");
}
}
取消系统的返回手势
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
六、UIWebView在IOS9下底部出现黑边解决方式：
UIWebView底部的黑条很难看(在IOS8下不会，在IOS9会出现)，特别是在底部还有透明控件的时候，隐藏的做法其实很简单，只需要将opaque设为NO，背景色设为clearColor即可
七、获取UIWebView的高度
(void)webViewDidFinishLoad (UIWebView *)webView {
CGFloat height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight"] floatValue];
CGRect frame = webView.frame;
webView.frame = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, height);
}
八、设置UILable 的行间距 和 计算带行间距的高度
/*
UILabel* 展示的控件
(NSString*)str 内容
withFont:(float)font 字体大小
WithSpace:(float)space 行间距
*/
//给UILabel设置行间距和字间距
-(void)setLabelSpace:(UILabel*)label withValue:(NSString*)str withFont:(float)font WithSpace:(float)space{
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.lineBreakMode = NSLineBreakByCharWrapping;
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.lineSpacing = space; //设置行间距
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent = 0.0;
paraStyle.paragraphSpacingBefore = 0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
//设置字间距 NSKernAttributeName:@1.5f
UIFont *tfont = [UIFont systemFontOfSize:font];
NSDictionary *dic = @{NSFontAttributeName:tfont, NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f
};
NSAttributedString *attributeStr = [[NSAttributedString alloc] initWithString:str attributes:dic];
label.attributedText = attributeStr;
}
/*
计算UILabel的高度(带有行间距的情况)
(NSString*)str 内容
withFont:(float)font 字体大小
WithSpace:(float)space 行间距
(CGFloat)width UILable的宽度
*/
//计算UILabel的高度(带有行间距的情况)
-(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(float)font withWidth:(CGFloat)width WithSpace:(float)space{
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.lineBreakMode = NSLineBreakByCharWrapping;
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.lineSpacing = space;
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent = 0.0;
paraStyle.paragraphSpacingBefore = 0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
UIFont *tfont = [UIFont systemFontOfSize:font];
NSDictionary *dic = @{NSFontAttributeName:tfont, NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f
};
CGSize size = [str boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
return size.height;
}
九、键盘回收
[self.view endEditing:YES];
10、图片阴影
UIImageView *userImageView = [[UIImageView alloc] init];
userImageView.backgroundColor = [UIColor whiteColor];
userImageView.layer.cornerRadius = 7;
// userImageView.layer.masksToBounds = YES;
userImageView.layer.shadowColor = _Main_BlueColor.CGColor;
userImageView.layer.shadowOpacity = 0.1f;
userImageView.layer.shadowRadius = 5;
userImageView.layer.shadowOffset = CGSizeMake(4,4);
11、webview莫名出现一条黑线
设置webview的属性opaque 可以解决
webview.opaque = NO;
持续更新～🙈
