2020-07-14

AppDelegate 添加属性，全局调用

使用runtime来实现

static NSString * const alertKey = @"alertKey"; //key

BOOLisShow =YES;

 objc_setAssociatedObject(self, &alertKey, @(isShow), OBJC_ASSOCIATION_ASSIGN);

id isShow = objc_getAssociatedObject(self, &alertKey);