耗盡完成塊不起作用。 Swift

我有PhotoBrowser（它從UIViewController繼承）作爲presentedViewController。我從UITableViewController提出。當我點擊按鈕時，PhotoBrowser呈現actionMainController（它繼承自UIAlertController）。我想調用另一個UIAlertController，當我在actionMainController中選擇其中一個動作並在其被解除後立即顯示第二個UIAlertController但完成塊不起作用。我想補充一點，駁回actionMainController成功，它的工作原理耗盡完成塊不起作用。 Swift

class PhotoBrowser: SKPhotoBrowser { 

    // MARK: - Controllers 

    private var actionMainController = UIAlertController() 

    // MARK: - Lifecycle 

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


    // MARK: - override var 

    override var prefersStatusBarHidden: Bool { 
     return true 
    } 

    // MARK: - functions 

    func editAvatar() { 
     debugPrint("removePhoto") 

     actionMainController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet) 

     actionMainController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil)) 

     let deleteAction = UIAlertAction(title: "Delete Photo", style: .destructive) { (action) in 
      self.deletePhoto() 
     } 
     let takePhoto = UIAlertAction(title: "Take Photo", style: .default) { (action) in 

     } 
     let choosePhoto = UIAlertAction(title: "Choose Photo", style: .default) { (action) in 

     } 
     actionMainController.addAction(deleteAction) 
     actionMainController.addAction(takePhoto) 
     actionMainController.addAction(choosePhoto) 

     present(actionMainController, animated: true, completion: nil) 
    } 

    private func deletePhoto() { 
     actionMainController.dismiss(animated: true) { 
      // TODO: it 
//   self.showDeleteActionSheet() 
     } 
     showDeleteActionSheet() 
    } 

    private func showDeleteActionSheet() { 
     let deleteActionController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet) 
     deleteActionController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil)) 
     let deleteAction = UIAlertAction(title: "Delete Photo", style: .destructive) { (action) in 

     } 
     deleteActionController.addAction(deleteAction) 

     present(deleteActionController, animated: true, completion: nil) 
    } 
}

來源

2016-11-11 Alexander

行動的完成處理一些工作，把一個斷點在那裏，它被調用？ – Tj3n

從哪個類調用deletePhoto方法？ –

@Tj3n斷點沒有調用 – Alexander

你完成處理程序不被調用，因爲您的警報已經被解僱，你又試圖解除警報。

actionMainController.dismiss(animated: true) { 

    self.showDeleteActionSheet() 
}

相反，你應該做的是

let deleteAction = UIAlertAction(title: "Delete Photo", style: .destructive) { (action) in 

    self.showDeleteActionSheet() 
}

來源

2016-11-11 12:41:29

耗盡完成塊不起作用。 Swift

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