如何顯示viewcontroller：UIImagePickController並將其關閉（快速）

Question

我得到了這個uiactionsheet，它在UISplitViewController的viewcontroller中加載了uipickerviewcontroller

這是一個UIsplitviewcontroller，此代碼位於detailview上，從masterview調用detailview

但是，當我嘗試加載“單擊它”時，它會警告我並且不再繼續

   func actionSheet(actionSheet: UIActionSheet!, clickedButtonAtIndex buttonIndex: Int){
    var imagePicker = UIImagePickerController()
    imagePicker.delegate = self

    switch buttonIndex{

    case 0:
        imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum
        imagePicker.allowsEditing = true
        imagePicker.delegate = self
        NSLog("Vælg fra Biblioteket");
        break;
    case 1:
        imagePicker.sourceType = UIImagePickerControllerSourceType.Camera
        imagePicker.allowsEditing = true
        imagePicker.delegate = self
        NSLog("Vælg Kamera");
        break;
    default:
        NSLog("Default");
        break;
    }
    self.presentViewController(imagePicker, animated: true, completion: nil) // this is the problem 
}

警告是這樣的：警告：嘗試在已經顯示的內容上顯示（空）

我如何使用它：self.showDeatilViewController（imagePicker，true）它顯示出來，但是我根本無法將其關閉

這就是我認為它將被駁回的方式

    func imagePickerControllerDidCancel(picker: UIImagePickerController) {

    picker.dismissViewControllerAnimated(true, completion: nil)
}

如果我在viewDidLoad中運行此代碼，則可以工作

        var imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    imagePickerController.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum
    imagePickerController.allowsEditing = true
    self.presentViewController(imagePickerController, animated: true, completion: { imageP in

    })

我發現如果我寫這個：

        self.presentedViewController?.presentViewController(imagePicker, animated: true, completion: nil)

它顯示並關閉？！？！

Answer 1

我已經開始工作了……有人提醒我，8.0 IOS在打開應用程序的照片庫等時出現了一個錯誤。所以我將其放在這樣的主隊列中

dispatch_async(dispatch_get_main_queue()){
        imagePicker.delegate = self
        self.presentViewController(imagePicker, animated: true, completion: nil)
    }

現在就可以了！

稍有延遲，但有效