iOS版.如何在每个UIViewController上启用和禁用旋转？

Question

我有一个UIViewController,我想在不同的场景中禁用或启用屏幕旋转

例:

if flag {
   rotateDevice = false
}
else {
   rotateDevice = true
}

我怎样才能做到这一点？

Answer 1

我有答案.在AppDelegate,如果您旋转设备,请按viewcontroller等.此功能始终调用

更新swift 3/4

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask
{
    return self.restrictRotation
}

self.restrictRotation 是一个自定义参数.

如何使用:

在Appdelegate:

 var restrictRotation:UIInterfaceOrientationMask = .portrait

在ViewController中:

调用方法ViewDidLoad或viewWillAppear时.我们将改变如下:

(UIApplication.shared.delegate as! AppDelegate).restrictRotation = .all 

然后将调用AppDelegate上的此方法.

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask

Answer 2

你只需要实现shouldAutorotate并supportedInterfaceOrientations进入你的UIViewController.看一下这个文档.例如:

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

您还可以指定可用的方向.这是一个只有肖像方向的例子:

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

编辑:如果你想支持关于旗帜的不同方向,你只需要做这样的事情:

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
    if myFlag {
        return .Landscape
    } else {
        return .All
    }
}

(如果myFlag是,它将允许Landscape方向.否则,它将允许所有方向).

Answer 3

迅速4

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    get {
        return .portrait

    }
}

Answer 4

一个简单的解决方案，可满足您的最常见要求（iPhone：纵向，iPad：全部）AppDelegate：

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    return UIDevice.current.userInterfaceIdiom == .phone ? .portrait : .all
}

Answer 5

在Swift 5中，如前所述，如果要允许（避免其他）特定的UIViewController沿某个方向旋转，则必须重写UIViewController类中的“ supportedInterfaceOrientations”，如下所示：

class MyViewController:UIViewController{
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask{
        get{
            return .portrait
        }
    }
}

这里有可能的选项：

public struct UIInterfaceOrientationMask : OptionSet {

    public init(rawValue: UInt)


    public static var portrait: UIInterfaceOrientationMask { get }

    public static var landscapeLeft: UIInterfaceOrientationMask { get }

    public static var landscapeRight: UIInterfaceOrientationMask { get }

    public static var portraitUpsideDown: UIInterfaceOrientationMask { get }

    public static var landscape: UIInterfaceOrientationMask { get }

    public static var all: UIInterfaceOrientationMask { get }

    public static var allButUpsideDown: UIInterfaceOrientationMask { get }
}

扩展的

如果要区分iPad或iPhone，可以使用UIUserInterfaceIdiom：

override var supportedInterfaceOrientations: UIInterfaceOrientationMask{
    get{
        return UIDevice.current.userInterfaceIdiom == .phone ? [.portrait, . portraitUpsideDown]:.all //OBS -> You can also return an array
    }
}

哪里：

public enum UIUserInterfaceIdiom : Int {


    case unspecified

    @available(iOS 3.2, *)
    case phone // iPhone and iPod touch style UI

    @available(iOS 3.2, *)
    case pad // iPad style UI

    @available(iOS 9.0, *)
    case tv // Apple TV style UI

    @available(iOS 9.0, *)
    case carPlay // CarPlay style UI
}