swift - 窗口无法快速添加 subview

Question

在函数 Appdelegate - didFinishLaunchingWithOptions 中实现:

var testView : UIView = UIView(frame: CGRectMake(100, 100, 100, 100))
testView.backgroundColor = UIColor.blueColor()
self.window?.addSubview(testView)
self.window?.bringSubviewToFront(testView)
self.window?.makeKeyAndVisible()

但不显示testView。

Answer 1

您需要做的就是为您的窗口添加框架。

您的代码将是:

window = UIWindow(frame: UIScreen.mainScreen().bounds)

var testView : UIView = UIView(frame: CGRectMake(0 , 0, 100, 100))
testView.backgroundColor = UIColor.blueColor()
self.window?.addSubview(testView)
self.window?.bringSubviewToFront(testView)
self.window?.makeKeyAndVisible()