单击LogOut Button

Question

我有一个来自一个ViewController的segue。

当点击LogOut按钮（转到LogIn ViewController）时，一个应该运行（现在崩溃），另一个运行（工作正常）点击缩略图一段视频。

由于我需要从服务器检索视频并将其显示在我正前往（WatchVideoViewController）的ViewController中，我会执行以下代码：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

        // Get a reference to a destination View Controller
        let detailViewController = segue.destinationViewController as! WatchVideoViewController

        // Set the selected video property of the destination view controller
        detailViewController.selectedVideo = self.selectedVideo
    }

正如您可能猜到这个代码在执行每个segue时运行，这就是我的LogOut segue崩溃的原因。

Could not cast value of type 'AppName.LoginViewController' to 'Appname.WatchVideoViewController'.

以下是我称之为segues的代码片段：

@IBAction func pressLogOutButton(sender: AnyObject) {
        self.performSegueWithIdentifier("logOutSegue", sender: self)
    }


// Handle event when user selects a cell(thumbnail)

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        // Take note of which video is selected
        self.selectedVideo = self.videos[indexPath.row]

        // Call the segue
        self.performSegueWithIdentifier("goToVideo", sender: self)
    }

调用pressLogOutButton时有没有办法避免运行prepareForSegue？非常感谢！

Answer 1

检入prepareForSegue

if segue.identifier == "logOutSegue" //执行注销逻辑