Question

我有一个带有ViewController的TabBar。我在AppDelegate中这样做。所以我有一个UINavigationController

test1ViewController = [[Test1ViewController alloc] init];
test2ViewController = [[Test2ViewController alloc] init];
test3ViewController = [[Test3ViewController alloc] init];

UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController: test2ViewController];

NSArray* controllers = [NSArray arrayWithObjects: test1ViewController, navigationController, test3ViewController, nil];
[self.tabBarController setViewControllers:controllers animated:YES];

[navigationController release];

现在我遇到了这行源代码的问题：

[(Test2ViewController *)[appDelegate.myTabBarController selectedViewController] methodName:arg1 withTag:arg2];

这里会有一个SIGBRT，因为selectedViewController在这种情况下是一个“UINavigationController”。但我想调用“Test2ViewController”的方法。我怎么能这样做？通常我也会这样做：

if([[appDelegate.myTabBarController selectedViewController] isKindOfClass:[Test2ViewController class]]) { ... }

但这也失败了，因为它是一个UINavigationController。如何解决？有谁知道吗？

提前多多感谢＆amp;最诚挚的问候。

Answer 1

尝试以下方法：

UINavigationController   *navController = (UINavigationController *) [appDelegate.myTabBarController selectedViewController];
Test2ViewController      *viewController = (Test2ViewController *) [[navController viewControllers] objectAtIndex: 0];

[viewController methodName:arg1 withTag:arg2];

TabBarController isKindOfClass - UINavigationController的问题

1 个答案: