这一直困扰我一段时间.我在UITabBarController中有一个UISplitViewController.主视图是TableView.当我单击一个单元格时,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>.
TestViewController非常基础,为什么会这样呢？
