如何在 UIAlertController 被解除之前执行 UIAlertAction 处理程序？答案

【问题标题】：How can I get a UIAlertAction handler to execute before the UIAlertController is dismissed?如何在 UIAlertController 被解除之前执行 UIAlertAction 处理程序？
【发布时间】：2014-11-30 07:15:21
【问题描述】：

我想从 UIAlertAction 调用 segue，但处理程序在 UIAlertController 完成解除之前不会执行。

let editMenu = UIAlertController(title: "Edit", message: nil, preferredStyle: .ActionSheet)

        let myAction = UIAlertAction(title: "My Action", style: UIAlertActionStyle.Default, handler: {(action: UIAlertAction!) -> Void in
                tableView.setEditing(false, animated: true)

            self.performSegueWithIdentifier("some_segue", sender: self)

        })
editMenu.addAction(myAction)
self.presentViewController(editMenu, animated: false, completion: nil)

我希望处理程序立即执行。

【问题讨论】：

标签： ios swift xcode6

【解决方案1】：

AFAIK 只需在您显示/呈现警报后编写它，因为线程不会等待它回来：

// Create the controller
let editMenu = UIAlertController(title: "Edit", message: nil, preferredStyle: .ActionSheet)
// Create an action for the controller with no handler
let myAction = UIAlertAction(title: "My Action", style: UIAlertActionStyle.Default, handler: nil)
// Add the action to the controller
editMenu.addAction(myAction)

// show the controller/Alert to the user
self.presentViewController(editMenu, animated: false, completion: nil)

// As the above calls won't wait for the user these lines will be executed immediately
tableView.setEditing(false, animated: true)
self.performSegueWithIdentifier("some_segue", sender: self)

希望有帮助

【讨论】：