【UIKit-124-2】#import <UIKit/UIView.h>

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【层级关系】

@interface UIView(UIViewHierarchy)

@property(nonatomic,readonly) UIView *superview;

@property(nonatomic,readonly,copy) NSArray *subviews;//遍历控件用

@property(nonatomic,readonly) UIWindow *window;

    NSArray *views = self.view.subviews;        for (NSInteger ii = 0; ii < views.count; ii++) {        if ([[views objectAtIndex:ii] isKindOfClass:[UIButton class]]) {                UIButton *btn = (UIButton *)[views objectAtIndex:ii];            [btn addTarget:self action:@selector(btnAction) forControlEvents:UIControlEventTouchUpInside];                    }            }

【添加，移除，交换层级】

- (void)removeFromSuperview;//移除

- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;//在。。位置插入

- (void)exchangeSubviewAtIndex:(NSInteger)index1 withSubviewAtIndex:(NSInteger)index2;//交换

- (void)addSubview:(UIView *)view;//添加

- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview;//在。。下面插入

- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview;//在。。上面插入

- (void)bringSubviewToFront:(UIView *)view;//移到最顶层

- (void)sendSubviewToBack:(UIView *)view;//置于最底层

-(void)soeasy{<span style="white-space:pre"></span>NSLog("不写了");}

【重写已经，将要】

- (void)didAddSubview:(UIView *)subview;//已经添加子视图

- (void)willRemoveSubview:(UIView *)subview;//将要移除子视图

- (void)willMoveToSuperview:(UIView *)newSuperview;//将要添加到父视图

- (void)didMoveToSuperview;//已经添加到父视图

- (void)willMoveToWindow:(UIWindow *)newWindow;//将要展示到屏幕

- (void)didMoveToWindow;//已经展示到屏幕

-(void)didAddSubview:(UIView *)subview{    NSLog(@"3didAddSubview");    }-(void)willRemoveSubview:(UIView *)subview{    NSLog(@"willRemoveSubview");    }- (void)willMoveToSuperview:(UIView *)newSuperview{    NSLog(@"1willMoveToSuperview");}- (void)didMoveToSuperview{    NSLog(@"2didMoveToSuperview");}- (void)willMoveToWindow:(UIWindow *)newWindow{    NSLog(@"4willMoveToWindow");}- (void)didMoveToWindow{    NSLog(@"5didMoveToWindow");}

【判断是否是子视图，tag后去视图】

- (BOOL)isDescendantOfView:(UIView *)view; //判断view是否是自己否控件

        greenView = [[UIView alloc]initWithFrame:CGRectMake(100, 200, 100, 100)];    greenView.backgroundColor = [UIColor greenColor];    [self.view addSubview:greenView];        if ([greenView isDescendantOfView:self.view]) {        NSLog(@"yes");    }

- (UIView *)viewWithTag:(NSInteger)tag; //通过tag，获取控件

    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    [button setFrame:CGRectMake(111, 111, 111, 111)];    button.backgroundColor = [UIColor purpleColor];    button.tag = 1000;    [self.view addSubview:button];            //通过tag 获取UIView，转换成UIButton，    UIButton *btn = (UIButton *)[self.view viewWithTag:1000];    [btn addTarget:self action:@selector(btnAction) forControlEvents:UIControlEventTouchUpInside];

【自动布局，重新布局】

- (void)setNeedsLayout;//标记需要重新布局

- (void)layoutIfNeeded;//重新布局

- (void)layoutSubviews;// 重新布局

    //假设blueView 是通过自动布局，先标记，在布局。        [blueView setNeedsLayout];    [blueView layoutIfNeeded];

@end

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