Question

我的主视图控制器为UITabBarController，标签栏项为4 UINavigationControllers。每个导航栏都有几个不同的视图，可以将其推到堆栈上。

我有一个我想要自动旋转的视图，但我无法在该视图控制器中调用willAnimateFirstHalfOfRotationToInterfaceOrientation。

我已尝试对UITabBarController和UINaviationControllers进行子类化，并为shouldAutorotateToInterfaceOrientation添加覆盖，如下所示：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

即便如此，我无法让视图旋转。我想也许最顶级的UIViewController（包括标签和导航）必须能够旋转。甚至每个视图都在链上。我已经尝试为每个控制器覆盖shouldAutorotateToInterfaceOrientation但仍无法使视图旋转。

有人完成了这项工作或有任何建议吗？

提前致谢！

Answer 1

除了像覆盖houldAutorotateToInterfaceOrientation一样对tabBarController进行子类化之外，还必须执行以下操作：

在控制器的viewDidLoad方法中，要添加要旋转的视图：

self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

在要添加要旋转的视图的控制器中添加此委托方法：

 - (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    //NSLog(@"didRotateFromInterfaceOrientation");


    if((fromInterfaceOrientation == UIInterfaceOrientationPortrait) ||
       (fromInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown))
    {    

        YourAppDelegate *mainDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];
    [mainDelegate.tabBarController.view addSubview: viewToBeRotated];

    [viewToBeRotated setHidden:NO];

    return;

}

if(fromInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || fromInterfaceOrientation == UIInterfaceOrientationLandscapeRight)
{
    [viewToBeRotated removeFromSuperview];
    [self.view setHidden:NO];
}

}

您可能还想添加以下方法：

- (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation 
                                                duration:(NSTimeInterval)duration {

if (toInterfaceOrientation == UIInterfaceOrientationPortrait)
{
    //self.view = self.portrait;
    YourAppDelegate *mainDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];
    [viewToBeRotated removeFromSuperview];
    mainDelegate.tabBarController.view.transform = CGAffineTransformIdentity;
    mainDelegate.tabBarController.view.transform = CGAffineTransformMakeRotation(degreesToRadian(0));
    mainDelegate.tabBarController.view.bounds = CGRectMake(0.0, 0.0, 300.0, 480.0);

}
else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft)
{
    YourAppDelegate *mainDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];
    [mainDelegate.tabBarController.view addSubview: viewToBeRotated];
    mainDelegate.tabBarController.view.transform = CGAffineTransformIdentity;
    mainDelegate.tabBarController.view.transform = CGAffineTransformMakeRotation(degreesToRadian(-90));
    mainDelegate.tabBarController.view.bounds = CGRectMake(0.0, 0.0, 460.0, 320.0);
}
else if (toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)
{


//self.view = self.portrait;
        YourAppDelegate *mainDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];
        [viewToBeRotated removeFromSuperview];
        mainDelegate.tabBarController.view.transform = CGAffineTransformIdentity;
        mainDelegate.tabBarController.view.transform = CGAffineTransformMakeRotation(degreesToRadian(180));
        mainDelegate.tabBarController.view.bounds = CGRectMake(0.0, 0.0, 300.0, 480.0);
    }
    else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight)
    {
        YourAppDelegate *mainDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];
        [mainDelegate.tabBarController.view addSubview: viewToBeRotated];
        mainDelegate.tabBarController.view.transform = CGAffineTransformIdentity;
        mainDelegate.tabBarController.view.transform = CGAffineTransformMakeRotation(degreesToRadian(90));
        mainDelegate.tabBarController.view.bounds = CGRectMake(0.0, 0.0, 460.0, 320.0);
    }
}

您可能还想看看

Rotating the iPhone, and instantiating a new UIViewController

TabBarController and navigationControllers in landscape mode

Answer 2

您可以使用SubClassed UITabBarController（或使用附加内容）询问所选的navigationController，以获取visibleViewController对轮换请求的响应：

@implementation RotatingTabBarController
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
        if([self.selectedViewController isKindOfClass:[UINavigationController class]]){
           return [[(UINavigationController*)self.selectedViewController visibleViewController] shouldAutorotateToInterfaceOrientation:interfaceOrientation];
        } else {
           return [self.selectedViewController shouldAutorotateToInterfaceOrientation:interfaceOrientation];
        }
}
@end

Answer 3

继承UITabBarController并重写此方法：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

我认为我的真正问题是XCode没有编译更新的代码。我做了Build clean，触摸并重新启动了XCode和模拟器，最后更改了。

在UITabBarController和UINavigationController中自动旋转视图

3 个答案: