ios - 覆盖应用程序方向设置

Question

我有一个应用程序，我在它的目标设置中将方向设置为纵向:

在一个特定的 View Controller 中，我想覆盖此设置，以便自动布局将在设备旋转时更新 View 。我试过这些方法都没有成功:

override func shouldAutorotate() -> Bool {
    return true
}

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
    return UIInterfaceOrientationMask.AllButUpsideDown
}

Answer 1

如果我已经阅读了接受的答案，我就不必自己写了。我的版本更长，但只需要应用程序委托(delegate)的 application(_:supportedInterfaceOrientationsFor:) 方法。它可能适用于您无法更改或不想更改目标 View Controller 的情况。例如，第三方 View Controller 。

我的灵感来自 Apple 的官方文档:supportedInterfaceOrientations

我的应用程序在 iPhone 上以纵向运行，在 iPad 上以所有方向运行。我只希望一个 View Controller (一个 JTSImageViewController 呈现一个更大 View 的图像)能够旋转。

信息.plist

Supported interface orientations = Portrait
Supported interface orientations (iPad) = Portrait, PortraitUpsideDown, LandscapeLeft, LandscapeRight

如果应用委托(delegate)实现了application(_:supportedInterfaceOrientationsFor:)，Info.plist 可能会被忽略。但是，我没有验证这一点。

swift 4

func application(_ application: UIApplication,
                 supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    // Early return for iPad
    if UIDevice.current.userInterfaceIdiom == .pad {
        return [.all]
    }
    // Search for the visible view controller
    var vc = window?.rootViewController
    // Dig through tab bar and navigation, regardless their order 
    while (vc is UITabBarController) || (vc is UINavigationController) {
        if let c = vc as? UINavigationController {
            vc = c.topViewController
        } else if let c = vc as? UITabBarController {
            vc = c.selectedViewController
        }
    }
    // Look for model view controller
    while (vc?.presentedViewController) != nil {
        vc = vc!.presentedViewController
    }
    print("vc = " + (vc != nil ? String(describing: type(of: vc!)) : "nil"))
    // Final check if it's our target class.  Also make sure it isn't exiting.
    // Otherwise, system will mistakenly rotate the presentingViewController.
    if (vc is JTSImageViewController) && !(vc!.isBeingDismissed) {
        return [.allButUpsideDown]
    }
    return [.portrait]
}