【UIKit-124-2】#import <UIKit/UIView.h>

最新推荐文章于 2022-09-08 15:36:49 发布

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最新推荐文章于 2022-09-08 15:36:49 发布

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文章标签： subviews isDescendantOfView viewWithTag setNeedsLayout layoutIfNeeded

本文链接：https://blog.youkuaiyun.com/u013059266/article/details/48639489

本文深入探讨了Swift编程语言在iOS应用开发中的应用，重点讲解了如何利用自动布局实现界面的灵活调整，并通过视图层级管理优化用户体验。文章还介绍了如何通过代码实现子视图的添加、移除、交换操作，以及如何通过视图的tag属性快速定位特定控件。此外，还详细阐述了视图的重写与将要触发的事件回调机制，以及如何判断一个视图是否为当前视图的子视图。最后，文章提供了实例代码，帮助开发者更好地理解和实践这些高级视图管理技巧。

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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