屏幕旋转在iOS 5上不起作用，但在iOS 6上运行

Question

我目前在iOS 5上遇到屏幕旋转问题。在iOS 6上，一切正常，但即使调用了通知UIDeviceOrientationDidChangeNotification，旋转也无法在iOS 5上运行。

我正在使用Storyboard，这就是我ViewController的样子：

为了旋转屏幕，我使用以下方法：

CustomTabBarViewController.mm（UITabBarController）

- (BOOL)shouldAutorotate {
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations {
    if (isLandscapeOK) {
        // for iPhone, you could also return UIInterfaceOrientationMaskAllButUpsideDown
        return UIInterfaceOrientationMaskAllButUpsideDown;
    }
    return UIInterfaceOrientationMaskPortrait;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if (isLandscapeOK) {
        // for iPhone, you could also return UIInterfaceOrientationMaskAllButUpsideDown
        return (interfaceOrientation == UIInterfaceOrientationMaskAllButUpsideDown);
    }
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

TabBarItemController.mm（UINavigationView）

-(BOOL)shouldAutorotate
{
    return [self.topViewController shouldAutorotate];
}

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

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return [self.topViewController shouldAutorotateToInterfaceOrientation:interfaceOrientation];
}

LoyaltyListController.mm（UIViewController）

- (void) didRotate:(NSNotification *)notification
{
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

    if (orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight)
    {
        self.navigationController.navigationBarHidden = YES;
        [self hideTabBar:self.tabBarController];
        portraitView.hidden = YES;
        landscapeView.hidden = NO;
    }
    else if (orientation == UIDeviceOrientationPortrait)
    {
        self.navigationController.navigationBarHidden = NO;
        [self showTabBar:self.tabBarController];
        portraitView.hidden = NO;
        landscapeView.hidden = YES;
        [notificationView setFrame:CGRectMake(0, - (notificationView.frame.size.height + 40), notificationView.frame.size.width, notificationView.frame.size.height)];
    }
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];
    [(CustomTabBarViewController*)[self tabBarController] setLandscapeOK:YES];
}

- (BOOL)shouldAutorotate {
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskAllButUpsideDown;
}

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

以下是iOS 5的屏幕：

人像：

风景:(没有旋转）

这是它应该是什么样子：

有什么想法吗？

Answer 1

对于iOS 5，请使用- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)

在iOS 6中，已弃用，但如果您使用它则无关紧要。 它只会在iOS 5.0或更低版本的情况下被调用。

<强>更新： UIInterfaceOrientationMaskAllButUpsideDown 不是UIInterfaceOrientation枚举类型。 在iOS 6中使用遮罩来提供遮罩值，以便在iOS 5中提供您想要支持的方向组合。

您必须检查interfaceOrientaion是否为

UIInterfaceOrientationLandscapeLeft,UIInterfaceOrientationLandscapeRight, UIInterfaceOrientationPortrait or UIInterfaceOrientationPortraightUpsideDown.

并根据您要支持的所有方向返回YES或NO。

在您的情况下使用：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
   return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
 /* If you are supporting all, simply return YES,

 if you aren't supporting any return NO, otherwise Use || and check which ones you wanna return YES for.
 In this case you wanna support all except UpsideDown hence use this. */
}

Answer 2

你必须返回YES以支持iOS 5及之前的所有方向及其在iOS中的弃用而不是在iOS 6中调用，你已经正确实现了iOS6方法

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