ios - 如何显示 View Controller : UIImagePickController and dismiss it (Swift)

Question

我得到了这个加载 uipickerviewcontroller 的 uiactionsheet它在 UISplitViewController 中的 View Controller 中

它是一个UIsplitviewcontroller，这段代码在detailview上，detailview是从masterview调用的

但是，当我尝试加载它时“单击它”，它会给我一个警告并且不会再继续了

   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 
}

警告是这样的:警告:尝试呈现已经呈现(空)

如果我用这个怎么办: self.showDeatilViewController(imagePicker, true) 它出现了，但我根本无法关闭它

这是我认为它会被驳回的方式

    func imagePickerControllerDidCancel(picker: UIImagePickerController) {

    picker.dismissViewControllerAnimated(true, completion: nil)
}

如果我在 viewDidLoad 中运行这段代码，它会起作用

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

    })

我发现如果我这样写:

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

它显示并关闭 ?!?!

Answer 1

我已经开始工作了...有人提醒我 8.0 IOS 在打开 photolibery 等应用程序时存在错误..所以我像这样把它放在主队列中

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

现在可以了!

稍有延迟但有效