iOS 6：supportedInterfaceOrientations 被调用，但 shouldAutorotate 未被调用

Question

我知道在iOS 6 shouldAutorotate: is NOT being called 之前有人问过这个问题。但我的情况有点不同。
最初，在应用程序启动时，我加载了一个 viewController，例如
self.window.rootViewController = self.viewController;
并且当加载此视图时，我正在使用自定义 tabBar 视图（从 UIView 继承），每个选项卡都有 5 个 UINavigationController。这个viewController类的代码是：

\\\ .h File

@protocol tabbarDelegate <NSObject>
-(void)touchBtnAtIndex:(NSInteger)index;
@end
@class tabbarView;
@interface ViewController : UIViewController <tabbarDelegate>
@property(nonatomic,strong) tabbarView *tabbar;
@property(nonatomic,strong) NSArray *arrayViewcontrollers;
@property(nonatomic,strong) UINavigationController * navigation1;
@property(nonatomic,strong) UINavigationController * navigation2;
@property(nonatomic,strong) UINavigationController * navigation3;
@property(nonatomic,strong) UINavigationController * navigation4;
@property(nonatomic,strong) UINavigationController * navigation5;
@end

和 m 文件是

- (void)viewDidLoad
{
[super viewDidLoad];

CGFloat orginHeight = self.view.frame.size.height- 60;
_tabbar = [[tabbarView alloc]initWithFrame:CGRectMake(0,  orginHeight, 320, 60)];
_tabbar.delegate = self;
[self.view addSubview:_tabbar];
_arrayViewcontrollers = [self getViewcontrollers];
[self touchBtnAtIndex:0];
}
-(void)touchBtnAtIndex:(NSInteger)index    \\This delegate method is called on every custom tabBar button clicked.
{
UIView* currentView = [self.view viewWithTag:SELECTED_VIEW_CONTROLLER_TAG];
[currentView removeFromSuperview];

UINavigationController *viewController = [_arrayViewcontrollers objectAtIndex:index];
viewController.view.tag = SELECTED_VIEW_CONTROLLER_TAG;
viewController.view.frame = CGRectMake(0,0,self.view.frame.size.width, self.view.frame.size.height- 50);

[self.view insertSubview:viewController.view belowSubview:_tabbar];
}
-(NSArray *)getViewcontrollers
{
FirstViewController *firstController = [[FirstViewController alloc]initWithNibName:@"FirstViewController" bundle:nil];
SecondViewController *secondController = [[SecondViewController alloc]initWithNibName:@"SecondViewController" bundle:nil];
ThirdViewController *thirdController = [[ThirdViewController alloc]initWithNibName:@"ThirdViewController" bundle:nil];
ForthViewController *forthController = [[ForthViewController alloc]initWithNibName:@"ForthViewController" bundle:nil];
FifthViewController *fifthController = [[FifthViewController alloc]initWithNibName:@"FifthViewController" bundle:nil];

navigation1 = [[UINavigationController alloc] initWithRootViewController:firstController];
navigation2 = [[UINavigationController alloc] initWithRootViewController:secondController];
navigation3 = [[UINavigationController alloc] initWithRootViewController:thirdController];
navigation4 = [[UINavigationController alloc] initWithRootViewController:forthController];
navigation5 = [[UINavigationController alloc] initWithRootViewController:fifthController];

NSArray* tabBarItems = [[NSArray alloc] initWithObjects:navigation1,navigation2,navigation3,navigation4,navigation5, nil];
return tabBarItems;
}

我还实现了 UINavigationController 的旋转类别：

@implementation UINavigationController (autoRotation)
-(BOOL)shouldAutorotate {
return [[self.viewControllers lastObject] shouldAutorotate];
}

-(NSUInteger)supportedInterfaceOrientations {
return [[self.viewControllers lastObject] supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}

我的问题是只调用了supportedInterfaceOrientations 方法，而从未调用过shouldAutorotate。主窗口的 rootViewController 是 ViewController 类，而不是任何 UINavigationController 或 UITabBarController。我做错了什么？请帮帮我。

Answer 1

如果您将这些添加到您的根视图控制器：

- (BOOL)shouldAutorotate
{
    NSLog(@"ViewController shouldAutorotate super=%d", [super shouldAutorotate]);
    return YES;
}
- (NSUInteger)supportedInterfaceOrientations
{
    NSLog(@"ViewController supportedInterfaceOrientations");
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}

您会看到系统不断地发送这两条消息。如果您愿意，您的代码可以查询活动的导航控制器以查看要返回的值。

另外，我不喜欢在 UINavigation 控制器上使用类别来覆盖这些 - 它的工作原理有点侥幸，并且导入其他一些执行相同操作的库可能会在以后导致意外后果。只需创建一个非常简单的子类并覆盖这两者。自 iOS4 以来，我一直在使用 UITabBarController 和 UINavigationController 这样做，并且从未遇到过问题。