用於陳述的C風格已棄用，將在未來版本的Swift中刪除

Question

您好，我在我的項目中有一些代碼，並且在下面的代碼中給出了警告;下面

爲VAR下一下

private var viewController: UIViewController? { 
     for var next:UIView? = self.superview; next != nil; next = next?.superview { 
      let responder = next?.nextResponder() 
      if let vc = responder as? UIViewController { 
       return vc 
      } 
     } 
     return nil 
    } 

警戒線：UIView的？ = self.superview; next！= nil; next = next？.superview {

我該如何解決它？

Answer 1

在這裏，您是如何與while週期重寫代碼：

var viewController: UIViewController? { 
    var next: UIView? = self.superview 
    while next != nil { 
     let responder = next?.nextResponder() 
     if let vc = responder as? UIViewController { 
      return vc 
     } 
     next = next?.superview 
    } 
    return nil 
}