【UIKit-124-2】#import <UIKit/UIView.h>

【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