如何从SKScene呈现UIAlertController

问题描述

我正在Spritekit中工作，并且试图从我的SKScene中呈现一个UIAlertController，但是这样做很麻烦.我看了几本教程，但没有UIAlertController教程专门针对Spritekit.我一直在下面看到此代码，但是由于SKScene不是UIViewController，所以它没有效果.

I'm working in Spritekit and I'm trying to present a UIAlertController from my SKScene, but I am having trouble doing it. I've watched several tutorials but none of the UIAlertController tutorials have been specific to Spritekit. I keep seeing this code below, but it has not been effective since SKScene is not a UIViewController.

[self presentViewController:self animated:YES completion:nil];

我在下面有其余的相对代码.谁能帮我在我的SKScene上展示我的UIAlerController.

I have the rest of the relative code below. Can anybody please help me present my UIAlerController on my SKScene.

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"You Lose!" message:@"Do You Want To Beat This Level?" preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *CancelButton = [UIAlertAction actionWithTitle:@"GiveUp" style:UIAlertControllerStyleAlert handler:<#^(UIAlertAction *action)handler#>]

推荐答案

SKScene实例不能调用presentViewController(_:animated:completion)，因为它不是UIViewController的子类.但是，如果您这样重写，则警报将启动:

The SKScene instance can't invoke presentViewController(_:animated:completion) because it is not a subclass of UIViewController. However, if you rewrite as such, your alert will launch:

self.view?.window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)

ps:尽管Attempt to present <UIAlertController: 0x7fc31eb32e50> on <Sample_Game.GameViewController: 0x7fc31bd9b4f0> which is already presenting会出现警告.如果有人知道如何消除此警告，那就太好了.

ps: there will be a warning though that Attempt to present <UIAlertController: 0x7fc31eb32e50> on <Sample_Game.GameViewController: 0x7fc31bd9b4f0> which is already presenting. If anyone knows how to eradicate this warning, that will be great.

[2016年8月11日更新]

[Updated 11 August 2016]

要消除上述警告，请检查rootViewController是否提供了视图控制器:

To eradicate the aforementioned warning, check if the rootViewController has presented a view controller:

 let vc = self.view?.window?.rootViewController
 if vc.presentedViewController == nil {
    vc.presentViewController(alert, animated: true, completion: nil)
 }

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