tabbarcontroller获取tabbaritem当前下标对应的navigationcontroller

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:@"下载管理"]){}}这个方法是通过tabbar的标题来进行识别，可以得到对应的navigationcontroller，另外views里面的东西是当前tabbar