iOS 6:调用supportedInterfaceOrientations，但不调用shouldAutorotate

Question

我知道以前有人问过这个问题，iOS 6 shouldAutorotate: is NOT being called。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，类似于

self.window.rootViewController = self.viewController;

当加载此视图时，我使用的是自定义tabBar视图(从UIView继承)，该视图每个选项卡都有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

而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;
}

我还实施了UINavigationController的轮调类别如下：

@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，只有supportedInterfaceOrientations方法被调用，而shouldAutorotate从未被调用。主窗口的rootViewController是ViewController类，而不是任何UINavigationController或UITabBarController。我做错什么了？请帮帮我。

Answer 1

如果将这些添加到根视图控制器中：

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

您将看到系统不断地发送这两条消息。您的代码可以查询active，以查看如果您愿意返回哪些值。

而且，我不喜欢在UINavigation控制器上使用一个类别来覆盖这些类--它的工作方式有点侥幸，并且导入其他类似的库可能会在稍后造成意想不到的后果。只需创建一个非常简单的子类，然后遍历这两个子类。从UITabBarController和UINavigationController开始，我就一直这样做，而且从来没有遇到过任何问题。