Initializing 'AppDelegate *__strong' with an expression of incompatible type 'id<UIApplicationDelega
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在写出了除了Home键外退出程序的点击事件时，代码 如下：
AppDelegate *delegate =[UIApplicationsharedApplication].delegate;
报Initializing 'AppDelegate *__strong' with an expression of incompatible type 'id<UIApplicationDelegate> _Nullable'的黄色警告，此时只需要在前面强制转换一下就好 如下代码：
(AppDelegate *)[UIApplicationsharedApplication].delegate
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- Initializing 'AppDelegate *__strong' with an expression of incompatible type 'id<UIApplicationDelega
- Initializing 'AppDelegate *__strong' with an expression of incompatible type
- Initializing 'Object' *__strong' with an expression of incompatible type 'id <Object> _Nullable
- Initalizing 'AppDelegate * __strong' with an expression of incompatible type ''id<UIApplicatioinDele
- 警告：Initalizing 'AppDelegate * __strong' with an expression of incompatible type ''id<UIApplication..
- Initalizing 'AppDelegate * __strong' with an expression of incompatible type ''id<UIApplicatioinDele
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