ios - 为什么 applicationState 被返回为零？

Question

我正在尝试检查我的 iOS 应用程序的应用程序状态，但是当我检查

[UIApplication sharedApplication].applicationState

我越来越零了。我检查了 [UIApplication sharedApplication] 不为零。我基本上只是检查屏幕是否打开，所以我只是检查以下结果：

[UIApplication sharedApplication].applicationState == UIApplicationStateActive

知道为什么我会得到零回报吗？

score 2 · Accepted Answer

OK your code is incorrect (I'm surprised it compiled):

UIApplicationState *applicationState = [UIApplication sharedApplication].applicationState;

Should be:

UIApplicationState applicationState = [UIApplication sharedApplication].applicationState;

(it's an enum not an object).

1 回答 1