Objective C iOS 9锁定viewController纵向方向

Question

升级我的项目后，请执行iOS 9.2，我的旧代码已过时

-(UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return UIInterfaceOrientationPortrait;
}

在收到一个旋转通知视图集旋转后，我发现了这个丑陋的解决方案（并用动画绘制了我的视图控制器）：

-(void)didRotate:(NSNotification *)notification
{

        [UIView animateWithDuration:0 animations:^{
            NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
            [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
        }];       
 }

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(didRotate:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:nil];

}

-(void)viewWillDisappear:(BOOL)animated
{
        [super viewWillDisappear:YES];

        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}

如何仅在此ViewController中锁定方向？

Answer 1

您可以将以下委托方法用于定向，并且该方法可适用于使用代码的类。 这三行代码足以锁定您的方向。

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return (UIInterfaceOrientationMaskPortrait);
}

Answer 2

对于iOS 9及更高版本

• 首先确定您的基本视图控制器
• 假设它是一个导航控制器。

导航控制器的属性：

@property (strong, nonatomic) UINavigationController *mainNavigationController;

将以上内容替换为：

@property (strong, nonatomic) MainNavigationContrller *mainNavigationController;

您的MainNavigationContrller.m如下所示：

@interface MainNavigationContrller ()

@end

@implementation MainNavigationContrller

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (BOOL)shouldAutorotate
{
    return YES;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    if(IPHONE)
    {
        UIViewController *topVC = ((AppDelegate*)[[UIApplication sharedApplication] delegate]).yourNavigationController.topViewController;
        if([topVC isKindOfClass:[yourViewController class]])
        {
            return UIInterfaceOrientationMaskPortrait;
        }
    }

    return UIInterfaceOrientationMaskAll;
}

这样，您就不必删除info.plist条目，而我们只能阻止特定视图的方向。

这对我有用。