View操做 swift

 1         //建立View
 2         let view1 =UIView()
 3         let view2 =UIView(frame: CGRectMake(20,120, 100,100))
 4         let view3 =UIView(frame: CGRectMake(40,140, 100,100))
 5         
 6         //設置view的尺寸
 7         view1.frame =CGRectMake(0,100, 100,100)
 8         
 9         //設置view的背景色
10         view1.backgroundColor =UIColor.redColor()
11         view2.backgroundColor =UIColor.greenColor()
12         view3.backgroundColor = UIColor.blueColor()
13         
14         //設置view的中心位置,不改變view的大小
15         view1.center =CGPointMake(80,200)
16     
17         //改變view的寬和高，視圖原來的中心位置不變
18         view1.bounds =CGRectMake(0,0, 40,40);
19         
20         //設置view的tag值
21         view1.tag =1;
22         view2.tag =2;
23         view3.tag =3;
24 
25         //依次添加三個視圖(從上到下是：藍，綠，紅)
26         self.view.addSubview(view1)
27         self.view.addSubview(view2)
28         self.view.addSubview(view3)
29         
30         //把view1（紅）移到最上面
31         self.view.bringSubviewToFront(view1)
32         
33         //把view3（藍）移到最下面
34         self.view.sendSubviewToBack(view3)
35         
36         //交換兩個視圖的位置
37         self.view.exchangeSubviewAtIndex(0, withSubviewAtIndex: 2)
38          
39         //把一個視圖插在某個位置
40         self.view.insertSubview(view1, atIndex:2)
41         
42         //把一個視圖插在另外一個視圖的下面
43         self.view.insertSubview(view1, belowSubview: view3)
44         
45         //把一個視圖插在另外一個視圖的上面
46         self.view.insertSubview(view1, aboveSubview: view2)
47          
48         //已經添加了某個視圖
49         self.view.didAddSubview(view1)
50             
51         //將要移除某個視圖
52         self.view.willRemoveSubview(view1)
53         
54         //把一個視圖從一個父視圖上移到另外一個父視圖上
55         self.view.willMoveToSuperview(view3)
56             
57         //已經移動到了父視圖上
58         self.view.didMoveToSuperview()
59         
60         //把一個視圖移動到一個窗口上
61         self.view.willMoveToWindow(UIApplication.sharedApplication().keyWindow)
62         
63         //已經移動到了一個窗口上
64         self.view.didMoveToWindow()
65             
66         //subViews中存放的(紅，綠，藍三個視圖)
67         let subViews :NSArray = NSArray.init(array:self.view.subviews)
68         
69         //如何找到一個視圖,其實此時view4就是view1,view5也是view1
70         let view4 = subViews.objectAtIndex(0)as! UIView
71         view4.backgroundColor =UIColor.blackColor()
72         let view5 =self.view.viewWithTag(1)
73         view5?.backgroundColor =UIColor.purpleColor()
74         
75         //隱藏view1
76         view1.hidden =true;
77         
78         //刪除View2
79         view2.removeFromSuperview()
80         
81         //再添加一個視圖
82         let lastView =UIView()
83         lastView.frame =CGRectMake(0,200, 200,200);
84         lastView.backgroundColor =UIColor.init(white:0.80, alpha: 1)
85         self.view.addSubview(lastView)
86         
87         //設置view的透明度
88         lastView.alpha =0.5
89 
90         //設置lastView的圓角角度
91         lastView.layer.cornerRadius =10
92         //設置邊框的的寬度
93         lastView.layer.borderWidth =2
94         //設置邊框的顏色
95         lastView.layer.borderColor =UIColor.redColor().CGColor
96         //容許剪切
97         lastView.clipsToBounds =true