Question

我有viewcontroller X和viewcontroller Y。

viewController X呈现Y，Viewcontroller X应该只以纵向模式显示，但是Y可以旋转到它想要的任何模式。

当我在横向模式下解除viewController Y时，我收到以下错误。在线：

[self dismissViewControllerAnimated:YES completion:nil];

错误：由于未捕获的异常'UIApplicationInvalidInterfaceOrientation'而终止应用程序，原因：'preferredInterfaceOrientationForPresentation必须返回支持的接口方向！'

在X Controller中，我有：

-(BOOL)shouldAutorotate
{
    return NO;
}


- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return UIInterfaceOrientationPortrait;
}

在Y控制器中我有：

-(BOOL)shouldAutorotate
{
    return YES;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAllButUpsideDown;
}

-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return UIInterfaceOrientationPortrait;
}

ios 6正常运行，但现在在xcode / ios7中引发了问题。现在，即使我正在解雇Y并在横向模式下回到X，我还是设置为更喜欢肖像，所以它不应该只是强制纵向模式而不管我是否有横向设备？

Answer 1

在关闭子viewController之前添加它：

[[UIDevice currentDevice] setValue：[NSNumber numberWithInteger：UIInterfaceOrientationPortrait] forKey：@＆＃34;取向＆＃34;];

假设您的父母是肖像

Answer 2

在YES方法中返回shouldAutorotate。也许你一直在错误的视图控制器中这样做。

Answer 3

请确保覆盖preferredInterfaceOrientationForPresentation: UIInterfaceOrientation，因为它会基于关闭的视图控制器的旋转而继承一个值。如果该值与您的视图控制器支持的界面方向不一致，则该应用将崩溃。

    /// Returns `.portrait` as the default preferred interface orientation for presentation.
    ///
    /// - Important: It's important to explicitly set this value to a value which is aligned with `supportedInterfaceOrientations`. Not doing so can lead to crashes.
    /// In certain scenarios, if not set explicitly this value will be inherited from a dismissing view controller. The application will crash if the dismissing view controller was rotated to an orientation which isn't supported by
    /// this view controller. (*** Terminating app due to uncaught exception 'UIApplicationInvalidInterfaceOrientation', reason: 'preferredInterfaceOrientationForPresentation 'landscapeRight' must match a supported
    /// interface orientation: 'portrait'!')
    override public var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        return .portrait
    }

在纵向解雇视图控制器时应用程序崩溃

3 个答案: