关闭完成块不起作用。 Swift

Question

我有 PhotoBrowser（它继承自 UIViewController）作为 presentedViewController。我从 UITableViewController 开始展示它。当我点击按钮时，PhotoBrowser 显示 actionMainController（它继承自 UIAlertController）。我想调用另一个 UIAlertController，当我 select actionMainController 中的一个操作并在其关闭后立即显示第二个 UIAlertController 但完成块不起作用。我想补充一点，关闭 actionMainController 成功，有效

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)
    }
}

Answer 1

您的完成处理程序未被调用，因为您的警报已被解除，而您再次尝试解除警报。

actionMainController.dismiss(animated: true) {

     self.showDeleteActionSheet()
}

相反，您应该在 Action 的完成处理程序上做一些工作

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

    self.showDeleteActionSheet() 
 }

关闭完成块不起作用。 Swift

Dissmiss completion block doesn't work. Swift

ios

swift

uialertcontroller

completion-block

swift3