OC - NSArray各种常用的API
- componentsJoinedByString 用某些自定符将字符串连接起来
NSString *str = [array componentsJoinedByString:@"."];
- containsObject 判断是否有这个值
[array containsObject:@22]
- indexOfObject 取数组元素的下标
NSInteger index2 = [array indexOfObject:@44]
- eumerateObjectsUsingBlock
[array enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)
- NSNotFound 判断是否找到
if(index3 == NSNotFound){
NSLog(@"-->not found");
}
- isEqual 比较数组中对象的值是否相等
array[i] isEqual:array2[i]
- isEqualToArray 比较两个数组是否相等
[array2 isEqualToArray:array]
- sortedArrayUsingConparator 排序
NSArray *array3 = @[@22,@1234,@456,@32,@67,@889,@990,@1234,@666];
NSArray *resultArray = [array3 sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return obj1 > obj2;
}];
- write to file
[array3 writeToFile:本地文件路径 atomically:YES];
- reverseObjectEnumerator.allObjects 反转数组中的元素
NSArray *arr = @[@11,@22,@33];
NSLog(@"%@",arr.reverseObjectEnumerator.allObjects);
自动布局(Masonry)
注意点：
1.设置自动布局大小时，是mas_equalTo
make.size.mas_equalTo(CGSizeMake(300, 300));
2.在一个父视图内添加一个子视图，设置边距
make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
等同于
make.top.equalTo(sv).with.offset(10);
make.left.equalTo(sv).with.offset(10);
make.bottom.equalTo(sv).with.offset(-10);
make.right.equalTo(sv).with.offset(-10);
简单代码如下：
#import "ViewController.h"
#import <Masonry.h>
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIView *view1 = [UIView new];
view1.backgroundColor = [UIColor redColor];
[self.view addSubview:view1];
//
// UIView *view2 = [UIView new];
// view2.backgroundColor = [UIColor blueColor];
// [self.view addSubview:view2];
//
// UIView *view3 = [UIView new];
// view3.backgroundColor = [UIColor purpleColor];
// [self.view addSubview:view3];
[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.top.width.equalTo(self.view);
make.height.equalTo(self.view).multipliedBy(0.3);
}];
// [view2 mas_makeConstraints:^(MASConstraintMaker *make) {
// make.top.equalTo(view1.mas_bottom);
// make.left.width.equalTo(view1);
// make.height.equalTo(self.view).multipliedBy(0.3);
// }];
//
// [view3 mas_makeConstraints:^(MASConstraintMaker *make) {
// make.edges.equalTo(view1).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
//
// }];
//循环排列：自动布局
int count = 3;
UIView *lastview = nil;
for (int i = 1; i <= count; i++) {
UIView *views = [UIView new];
views.backgroundColor = [UIColor colorWithHue:(arc4random()%256/256) saturation:(arc4random()%128/256)+0.5 brightness:(arc4random()%128/256)+0.5 alpha:1];
[self.view addSubview:views];
[views mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(self.view).offset(10);
make.right.equalTo(self.view).offset(-10);
make.height.equalTo(@(i*30));
if (lastview){
make.top.equalTo(lastview.mas_bottom).offset(10);
}else{
make.top.equalTo(view1.mas_bottom).offset(10);
}
}];
lastview = views;
}
}
@end
