我正在尝试创建这样的头文件:#importtypedefvoid(^RevealBlock)();@interfaceBFTasksViewController:UITableViewController{@privateRevealBlock_revealBlock;}-(id)initWithTitle:(NSString*)titlewithRevealBlock:(RevealBlock)revealBlock;@end但是我收到这个警告:Redefinitionoftypedef'RevealBlock'isaC11feature这有什么值得担心的吗？我在看GHSidebar