如何在iOS Swift 3中仅将一个视图控制器旋转为横向

您可以在这里找到更多答案：

这是为Swift3和SWIFT4提供的。 您可以在AppDelegate.swift中使用以下代码：

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    guard let rootViewController = self.topViewControllerWithRootViewController(rootViewController: window?.rootViewController),
     (rootViewController.responds(to: Selector(("canRotate")))) else{
        // Only allow portrait (standard behaviour)
        return .portrait;
    }
    // Unlock landscape view orientations for this view controller
    return .allButUpsideDown;
}

private func topViewControllerWithRootViewController(rootViewController: UIViewController!) -> UIViewController? {
    guard rootViewController != nil else { return nil }

    guard !(rootViewController.isKind(of: (UITabBarController).self)) else{
        return topViewControllerWithRootViewController(rootViewController: (rootViewController as! UITabBarController).selectedViewController)
    }
    guard !(rootViewController.isKind(of:(UINavigationController).self)) else{
        return topViewControllerWithRootViewController(rootViewController: (rootViewController as! UINavigationController).visibleViewController)
    }
    guard !(rootViewController.presentedViewController != nil) else{
        return topViewControllerWithRootViewController(rootViewController: rootViewController.presentedViewController)
    }
    return rootViewController
}

您可以在原始帖子中了解更多信息：