无法强制 UIViewController 方向

Unable to force UIViewController orientation

我有一个纵向应用程序和一个横向应用程序 ViewController。

我一直在研究如何在应用程序锁定为纵向时强制将方向设置为横向,并且我尝试了此处提供的许多解决方案,但到目前为止还没有成功。

到目前为止,我设法自动旋转了我需要的横向 VC,但由于方向未锁定,所有其他 VC 也会旋转。

override func viewDidAppear(animated: Bool)
{
    let value = UIInterfaceOrientation.LandscapeRight.rawValue
    UIDevice.currentDevice().setValue(value, forKey: "orientation")
}

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

经过更多的挖掘,我在找到一个示例项目后得到了这个,但是虽然它在那个项目中有效,但它似乎对我不起作用。

这是在 AppDelegate 中

func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> UIInterfaceOrientationMask {

    if self.window?.rootViewController?.presentedViewController is ConclusionReferencesVC {

        let conclusionReferencesVC = self.window!.rootViewController!.presentedViewController as! ConclusionReferencesVC

        if conclusionReferencesVC.isPresented
        {
            return UIInterfaceOrientationMask.LandscapeRight;
        }
        else
        {
            return UIInterfaceOrientationMask.Portrait;
        }
    }
    else
    {
        return UIInterfaceOrientationMask.Portrait;
    }
}

这是我想要的VC横屏:

var isPresented = true

@IBAction
func dismiss()
{
    isPresented = false
    self.presentingViewController!.dismissViewControllerAnimated(true, completion: nil);
}

出于某种原因,supportedInterfaceOrientationsForWindow 方法未验证初始条件。

我也尝试了这些,但没有成功:

有什么想法吗?似乎我错过了什么,但我不知道是什么。

试试这个只强制进入 LandscapeRight 模式

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        if(self.supportedInterfaceOrientations() == UIInterfaceOrientationMask.LandscapeRight && UIDevice.currentDevice().orientation != UIDeviceOrientation.LandscapeRight)
        {
            let value = UIInterfaceOrientation.LandscapeRight.rawValue
            UIDevice.currentDevice().setValue(value, forKey: "orientation")
        }

    }

然后使用这样的类别

    import UIKit

extension UINavigationController{

    override public func shouldAutorotate() -> Bool
    {
    return (self.viewControllers.last?.shouldAutorotate())!
    }

    override public func supportedInterfaceOrientations() ->UIInterfaceOrientationMask
    {
    return (self.viewControllers.last?.supportedInterfaceOrientations())!;
    }

    override public func preferredInterfaceOrientationForPresentation()-> UIInterfaceOrientation
    {
    return (self.viewControllers.last?.preferredInterfaceOrientationForPresentation())!;
    }

}

已编辑

如果您不使用导航控制器,请使用此

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        if(self.supportedInterfaceOrientations() == UIInterfaceOrientationMask.LandscapeRight && UIDevice.currentDevice().orientation != UIDeviceOrientation.LandscapeRight)
        {
            let value = UIInterfaceOrientation.LandscapeRight.rawValue
            UIDevice.currentDevice().setValue(value, forKey: "orientation")
        }

    }

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

希望对您有所帮助

可能我疯了 ;-),但你为什么不用这个?

作为 Reinier Melian 的 post 的更新,这里是 Swift 3 中的 UINavigationController 扩展:

import UIKit

extension UINavigationController {
    override open var shouldAutorotate: Bool {
        return (self.viewControllers.last?.shouldAutorotate)!
    }

    override open var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return (self.viewControllers.last?.supportedInterfaceOrientations)!
    }

    override open var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        return (self.viewControllers.last?.preferredInterfaceOrientationForPresentation)!
    }
}

不幸的是,如果您调用 UIImagePickerController,此代码会崩溃,因为它包含在最后一个视图控制器为 nil 的 UINavigationController 中。