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2015-03-10 09:55:34.197 Test[1140:29622] Warning: Attempt to present <UIAlertController: 0x7c95ca20> on <Test.ViewController: 0x7a6afc60> whose view is not in the window hierarchy! |
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import UIKitclass ViewController: UIViewController ,UIActionSheetDelegate { override func viewDidLoad() { super.viewDidLoad() } override func viewDidAppear(animated: Bool){ super.viewDidAppear(animated) var alertController = UIAlertController(title: "系统提示", message: "您确定要离开hangge.com吗？", preferredStyle: UIAlertControllerStyle.Alert) var cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil) var okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default, handler: nil) alertController.addAction(cancelAction) alertController.addAction(okAction) self.presentViewController(alertController, animated: true, completion: nil) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. }} |
Swift - whose view is not in the window hierarchy 问题解决方法
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原文地址：http://www.cnblogs.com/Free-Thinker/p/4838386.html
