UIApplication.sharedApplication不可用 [英] UIApplication.sharedApplication not available

问题描述

我正在尝试从UIViewController获取对我的app委托的引用，但我不断收到此错误消息：

I'm trying to get a reference to my app delegate from a UIViewController but I keep getting an this error message:

' sharedApplication（）'不可用：改为使用基于视图控制器的解决方案。

'sharedApplication()' is unavailable: Use view controller based solutions where appropriate instead.

我一直在阅读所有与此有关的文章一种消息，但我的问题似乎无关，因为我没有使用任何第三方框架。虽然今日扩展是我的应用程序的一部分，但发生错误的类完全不相关。我甚至创建了一个全新的类并继续得到同样的错误：

I've been reading all the articles dealing with this kind of message but my problem seems unrelated as I'm not using any third party framework. While a Today Extension is part of my app, the class in which the error occurs is totally unrelated. I even created a completely new class and keep getting the same error:

当我在操场上做同样的事情时它工作正常。我错过了什么？

When I do the same thing in a playground it works fine. What am I missing?

推荐答案

问题解决了。我再次去了我的应用程序的构建设置，偶然发现了

Problem solved. I've been to the Build Settings of my app again and stumbled over

Require Only AppExtension-Safe API

全部设为YES。默认值为NO。当我将此设置为NO时，错误消失。

all set to YES. The default though is NO. When I set this to NO the error disappeared.

我肯定不记得曾经接触甚至不知道这件事，但幸运的是现在它有效。

I sure don't remember ever touching or even knowing about this but luckily now it works.

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