如何从 SKScene 呈现 UIAlertController [英] How to present UIAlertController from SKScene

问题描述

我在 Spritekit 中工作，我正在尝试从我的 SKScene 中展示一个 UIAlertController，但我在做这件事时遇到了麻烦.我看过几个教程，但没有一个 UIAlertController 教程是专门针对 Spritekit 的.我一直在下面看到这段代码，但由于 SKScene 不是 UIViewController，因此它没有生效.

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];      

我有下面的其余相关代码.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，您的警报将启动:

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:虽然 Attempt to present <UIAlertController: 0x7fc31eb32e50> 会有一个警告.在 <Sample_Game.GameViewController: 0x7fc31bd9b4f0>已经呈现.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 是否已呈现视图控制器:

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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