尝试给我们 UIAlertController 打分

Question

每当我运行我的应用程序调用以下错误时

警告：试图在视图不在 window 层次结构中的 "MenuViewController" 上呈现 "The alert"！

这到底是什么意思，我该如何解决？

我只有一个 UIViewController，这里是

class MenuViewController: UIViewController {


    var iMinSessions = 3
    var iTryAgainSessions = 6



    func rateMe() {
        var neverRate = NSUserDefaults.standardUserDefaults().boolForKey("neverRate")
        var numLaunches = NSUserDefaults.standardUserDefaults().integerForKey("numLaunches") + 1

        if (!neverRate && (numLaunches == iMinSessions || numLaunches >= (iMinSessions + iTryAgainSessions + 1)))
        {
            showRateMe()
            numLaunches = iMinSessions + 1
        }
        NSUserDefaults.standardUserDefaults().setInteger(numLaunches, forKey: "numLaunches")
    }





    func showRateMe() {
        var alert = UIAlertController(title: "Rate Me", message: "Thanks for playing Pong Ball", preferredStyle: UIAlertControllerStyle.Alert)

        alert.addAction(UIAlertAction(title: "Rate Pong Ball!", style: UIAlertActionStyle.Default, handler: { alertAction in
            UIApplication.sharedApplication().openURL(NSURL(string : "itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=<iTUNES CONNECT APP ID>")!)

            alert.dismissViewControllerAnimated(true, completion: nil)
        }))

        alert.addAction(UIAlertAction(title: "No Thanks", style: UIAlertActionStyle.Default, handler: { alertAction in
            NSUserDefaults.standardUserDefaults().setBool(true, forKey: "neverRate")

            alert.dismissViewControllerAnimated(true, completion: nil)

        }))
        alert.addAction(UIAlertAction(title: "Maybe Later", style: UIAlertActionStyle.Default, handler: { alertAction in
            alert.dismissViewControllerAnimated(true, completion: nil)
        }))


        self.presentViewController(alert, animated: true, completion: nil)
    }






    override func viewDidLoad() {
        super.viewDidLoad()

//        Calling it

        rateMe()

        let skView = view as! SKView
        var scene = MenuScene(size: skView.bounds.size)
        skView.ignoresSiblingOrder = true
        scene.scaleMode = .AspectFill
        skView.presentScene(scene)
            }

    override func supportedInterfaceOrientations() -> Int {
        if UIDevice.currentDevice().userInterfaceIdiom == .Phone {
            return Int(UIInterfaceOrientationMask.AllButUpsideDown.rawValue)
        } else {
            return Int(UIInterfaceOrientationMask.All.rawValue)
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    override func prefersStatusBarHidden() -> Bool {
        return true
    }
}

Answer 1

在 viewDidLoad 中，您的视图尚未显示。将给我评分的呼叫从 viewDidLoad 移动到 viewDidAppear。

编辑

因为它是我的评分。我认为最好将它放在 applicationDidFinishLaunchWithOptions 的 appDelegate 中。

尝试给我们 UIAlertController 打分

trying to do a rate us UIAlertController

iphone

ios

swift

uialertcontroller

编辑