的UIApplication在swift3 Xcode8

Question

没有成员keywindow我在写这xcode8代码，但我有错误：

if let window = UIApplication.sharedApplication.keywindow{ 
      let blackView = UIView() 
      blackView.backgroundColor = UIColor.black 

      window.addSubview(blackView) 
      blackView.frame = view.frame 
     } 

，但我有错误的UIApplication没有成员keywindow

我应该怎么办！？

Answer 1

末我找了很多搜索后，如何解决：

if let window = UIApplication.shared.delegate?.window { 
      let blackView = UIView() 
      blackView.backgroundColor = UIColor.black 
      window?.addSubview(blackView) 
      blackView.frame = (window?.frame)! 

     } 

解决方法：

shared.delegate.window

，而不是

sharedApplication.keyw indow

和

blackView.frame = window.frame 

它更改为

blackView.frame = (window?.frame)! 

Answer 2

解决：（SWIFT 3）

if let window = UIApplication.shared.keyWindow { 
      let blackView = UIView() 
      blackView.backgroundColor = UIColor.black 

      window.addSubview(blackView) 
      blackView.frame = window.frame 
}