AppDelegate *delegate = [[UIapplication sharedApplication]delegate];NSArray *views = delegate.tabController.viewControllers; for(id vv in views){UINavigationController *cc = (UINavigationController *)vv;NSString *S = cc.title;if([S isEqualToString:@"下載管理"]){}}這個方法是通過tabbar的標題來進行識別，可以得到對應的navigationcontroller，另外views里面的東西是當前tabbar