ios - shouldAutorotate 未在 View Controller 上调用

Question

我有一个由单个 View Controller 组成的简单应用程序。我从 Xcode 7 GM 单 View 应用程序模板开始，但随后删除了主 Storyboard，并像这样设置我的 View Controller :

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    let vc = ViewController()

    window = UIWindow(frame: UIScreen.mainScreen().bounds)
    window!.rootViewController = vc
    window!.makeKeyAndVisible()

    return true
}

在我的信息 plist 中，我在 Supported Interface Orientations 下指定了所有方向，并且应用程序旋转到 iPad 上的所有方向。

但是，在我的简单 View Controller 中，永远不会调用 shouldAutorotate() 和 supportedInterfaceOrientations() 方法。这是一个问题，因为我正在试验启用和禁用自动旋转的 UI 控件。是什么阻止了调用这些方法？

示例项目 here (需要 Swift 2)

---

¹非UINavigationController

Answer 1

根据 Apple Developer 论坛上的这篇帖子，如果您启用了 iPad 多任务处理(iOS 9 中的新功能)，您将无法再控制所支持的方向:

https://forums.developer.apple.com/message/13508#13508

您可以添加反向旋转，但它并不漂亮，至少据我所知。我让它工作了，但是当你旋转时无法禁用角的动画，所以你会看到这种看起来很奇怪的情况，它看起来像在旋转，但内容没有旋转。

这是我用来对抗旋转的代码。请注意，我也必须隐藏状态栏，否则它也会旋转，我不知道如何解决这个问题。

另请注意，在 self.navigationController.view.superview.superview 上进行自动旋转可能不是最好的方法，并且可能会在将来的某个时候中断。可能有更好的方法来获得用于对抗旋转的正确 View 。显然，如果您不使用导航 Controller ，则需要传入不同的 View 。 YMMV.

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [[UIApplication sharedApplication] setStatusBarHidden:YES];
    self.startingInterfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
}

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];
    [self updateLayoutsForCurrentOrientation:toInterfaceOrientation view:self.navigationController.view.superview.superview];
}

- (void)updateLayoutsForCurrentOrientation:(UIInterfaceOrientation)toInterfaceOrientation view:(UIView *)view {
    CGAffineTransform transform = CGAffineTransformIdentity;

    if (self.startingInterfaceOrientation == UIInterfaceOrientationPortrait) {
        switch (toInterfaceOrientation) {
            case UIInterfaceOrientationLandscapeLeft:
                transform = CGAffineTransformMakeRotation(M_PI/2.0f);
                break;
            case UIInterfaceOrientationLandscapeRight:
                transform = CGAffineTransformMakeRotation(-M_PI/2.0f);
                break;
            case UIInterfaceOrientationPortrait:
                transform = CGAffineTransformIdentity;
                break;
            case UIInterfaceOrientationPortraitUpsideDown:
                transform = CGAffineTransformMakeRotation(M_PI);
                break;
            default:
                break;
        }
    }
    else if (self.startingInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
        switch (toInterfaceOrientation) {
            case UIInterfaceOrientationLandscapeLeft:
                transform = CGAffineTransformMakeRotation(-M_PI/2.0f);
                break;
            case UIInterfaceOrientationLandscapeRight:
                transform = CGAffineTransformMakeRotation(M_PI/2.0f);
                break;
            case UIInterfaceOrientationPortrait:
                transform = CGAffineTransformMakeRotation(M_PI);
                break;
            case UIInterfaceOrientationPortraitUpsideDown:
                transform = CGAffineTransformIdentity;
                break;
            default:
                break;
        }
    }
    else if (self.startingInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
        switch (toInterfaceOrientation) {
            case UIInterfaceOrientationLandscapeLeft:
                transform = CGAffineTransformIdentity;
                break;
            case UIInterfaceOrientationLandscapeRight:
                transform = CGAffineTransformMakeRotation(M_PI);
                break;
            case UIInterfaceOrientationPortrait:
                transform = CGAffineTransformMakeRotation(-M_PI/2.0f);
                break;
            case UIInterfaceOrientationPortraitUpsideDown:
                transform = CGAffineTransformMakeRotation(M_PI/2.0f);
                break;
            default:
                break;
        }
    }
    else if (self.startingInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        switch (toInterfaceOrientation) {
            case UIInterfaceOrientationLandscapeLeft:
                transform = CGAffineTransformMakeRotation(M_PI);
                break;
            case UIInterfaceOrientationLandscapeRight:
                transform = CGAffineTransformIdentity;
                break;
            case UIInterfaceOrientationPortrait:
                transform = CGAffineTransformMakeRotation(M_PI/2.0f);
                break;
            case UIInterfaceOrientationPortraitUpsideDown:
                transform = CGAffineTransformMakeRotation(-M_PI/2.0f);
                break;
            default:
                break;
        }
    }
    view.transform = transform;
}

大部分代码改编自 Jared Sinclair 的 JTSImageViewController(经他许可发布)，可在 GitHub 上根据 MIT 许可获得:https://github.com/jaredsinclair/JTSImageViewController