AppDelegate *app = [UIApplication sharedApplication].delegate;
// 强制转换即可 消除警告
AppDelegate app =(AppDelegate) [UIApplication sharedApplication].delegate;
AppDelegate *app = [UIApplication sharedApplication].delegate;
// 强制转换即可 消除警告
AppDelegate app =(AppDelegate) [UIApplication sharedApplication].delegate;
本文标题：Initalizing 'AppDelegate * _
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