Swift添加视图的层级,添加到最上层,添加到最下层

Swfit

//Swift UIView 层次调整
// 将红色挪到最上边
view.bringSubviewToFront(redView)
// 将蓝色挪到最下边
view.sendSubviewToBack(blueView)
// 互换
view.exchangeSubview(at: 1, withSubviewAt: 2)


swfit示例代码

 1 override func viewDidLoad() {
 2         super.viewDidLoad()
 3 
 4         view.backgroundColor = .white
 5         createUI()
 6     }
 7     
 8     func createUI() {
 9         
10         let redView = UIView()
11         redView.backgroundColor = .red
12         view.addSubview(redView)
13         redView.snp.makeConstraints { (make) -> Void in
14             make.top.equalTo(view).offset(200)
15             make.left.equalTo(view).offset(50)
16             make.size.equalTo(CGSize( 200, height: 200))
17         }
18         
19         let greenView = UIView()
20         greenView.backgroundColor = .green
21         view.addSubview(greenView)
22         greenView.snp.makeConstraints { (make) -> Void in
23             make.top.equalTo(view).offset(250)
24             make.left.equalTo(view).offset(100)
25             make.size.equalTo(CGSize( 200, height: 200))
26         }
27         
28         
29         let blueView = UIView()
30         blueView.backgroundColor = .blue
31         view.addSubview(blueView)
32         blueView.snp.makeConstraints { (make) -> Void in
33             make.top.equalTo(view).offset(300)
34             make.left.equalTo(view).offset(150)
35             make.size.equalTo(CGSize( 200, height: 200))
36         }
37         
38         //Swift UIView 层次调整
39         
40         // 将红色View挪到最上边
41         view.bringSubviewToFront(redView)
42         // 将蓝色View挪到最下边
43         view.sendSubviewToBack(blueView)
44         // 互换
45         view.exchangeSubview(at: 1, withSubviewAt: 2)
46     }

Objective-C

//将一个视图放在另一个视图上面
    - (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview;
    //将一个视图放在另一个视图下面
    - (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview;
    //view在最上层
    - (void)bringSubviewToFront:(UIView *)view;
    //view在最下层
    - (void)sendSubviewToBack:(UIView *)view;
     
    // 使用
    [self.view bringSubviewToFront:myView];
    [self.view sendSubviewToBack:myView];

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原文地址：https://www.cnblogs.com/weiios/p/16249035.html