objective-c - IOS5中的UITabbarcontroller抛出UIViewControllerHierarchyInconsistency异常

Question

我有以下 UITabbar Controller 的代码:

NSMutableArray *arr = [[NSMutableArray alloc] init];
tabBarController = [[UITabBarController alloc] init];

FirstViewController *firstview = [[FirstViewController alloc] init];
[tabBarControllerViews addObject:firstview];
[firstview release];

 SecondViewController *secondview = [[SecondViewController alloc] init];
[tabBarControllerViews addObject:secondview];
[secondview release];

[tabBarController setViewControllers:arr animated:YES];
[arr release];

self.view = tabBarController.view;

此代码在 IOS4 上运行良好。我在 IOS5 beta 上试过，点击 UITabbarItem 时出现以下错误:

*** Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency',
reason: 'child view controller:<FirstViewController: 0x6e03be0> should have parent view
controller:<MainViewController: 0x6816d20> but actual parent is:<UITabBarController: 0x6b0c110>'

Answer 1

替换:

self.view = tabBarController.view;

与:

[self.view addSubview:tabBarController.view];

这也将向后兼容 IOS3 和 4。