Initalizing 'AppDelegate * __strong' with an expression of incompatible type ''id<UIApplicatioinDele
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使用ARC时，获取全局的AppDelegate会有上面的警告。
修改前：
AppDelegate *app = [UIApplication sharedApplication].delegate;
修改后：即（强制转换）
AppDelegate *app = (AppDelegate*)[UIApplication sharedApplication].delegate;
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