iOS 警告 : Attempt to dismiss from view controller while a presentation or dismiss is in progress

Question

我创建了一个 UIImageView。当点击它时，一个 UIActionSheet 会弹出。

@IBOutlet weak var avatarImageView: UIImageView!

@IBAction func tapUIImageViewHandler(sender: UITapGestureRecognizer) {
    var popMenu: UIActionSheet = UIActionSheet(title: "Upload user avatar", delegate: self, cancelButtonTitle: "Cancel", destructiveButtonTitle: nil, otherButtonTitles: "Choose from library", "Take photo")
    popMenu.showInView(self.view)
}

func actionSheet(popMenu: UIActionSheet!, clickedButtonAtIndex buttonIndex: Int){
    println("click at index \(buttonIndex)")
    switch buttonIndex {
    case 2:
        takePhoto()
    case 1:
        chooseFromLib()
    default:
        break
    }
}

但是当我在模拟器上运行它时，在我点击 UIActionSheet 上的按钮后，我得到了

Warning: Attempt to dismiss from view controller while a presentation or dismiss is in progress!

有人可以帮我吗？谢谢!

Answer 1

请在呈现操作表时实现小延迟。

[self performSelector:@selector(presentActionsheet) withObject:nil afterDelay:0.2f];