Swift Unbalanced调用开始/结束外观转换

Question

这已经困扰了我一段时间了.我有一个UISplitViewController内部UITabBarController.主视图是TableView.当我点击一个单元格时,我会调出一个非常基本的视图控制器,只有一个UIButton居中.以下是视图控制器的代码:

class TestViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @IBOutlet weak var button: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func buttonPressed(sender: AnyObject) {
        let pickerC = UIImagePickerController()
        pickerC.delegate = self

        pickerC.modalPresentationStyle = .Popover
        pickerC.popoverPresentationController?.sourceView = button as UIView
        pickerC.popoverPresentationController?.sourceRect = (button as UIView).bounds
        pickerC.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.Any
        self.presentViewController(pickerC, animated: true, completion: nil)//4
    }

    func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
        self.dismissViewControllerAnimated(true, completion: nil)
    }

    func imagePickerControllerDidCancel(picker: UIImagePickerController) {
       self.dismissViewControllerAnimated(true, completion: nil)
    }
}

如果我单击取消或选择和图像,选择器控制器将正确解除.当我点击后退按钮返回TableView时出现问题,我收到:

Unbalanced calls to begin/end appearance transitions for <TestViewController: 0x7fb882a72380>.

这TestViewController是非常基本的,为什么会发生这种情况？

Answer 1

如果您尝试在上一个事务(动画)正在进行时推送新的视图控制器,则会出现此问题.因此,请检查您的代码流并进行适当的更改.检查您的解雇并呈现视图动画.您可以使用属性setAnimation'YES/NO'解决此问题

设置动画:不,可能会解决您的问题