如何在Swift中以编程方式旋转方向？

Question

我尝试了下一个：

UIDevice.currentDevice().setValue(UIInterfaceOrientation.Portrait.rawValue, forKey: "orientation")

on

viewWillAppear

但它不起作用。如何在viewWillAppear上旋转屏幕？

更新

我使用下一个代码来锁定方向：

var shouldRotate = true
func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> Int {
    if shouldRotate == true {
        return Int(UIInterfaceOrientationMask.Portrait.rawValue)
    } else {
        return Int(UIInterfaceOrientationMask.LandscapeLeft.rawValue)
    }
}

Swift 4.0

  private func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> Int {
        if shouldRotate == true {
            return Int(UIInterfaceOrientationMask.portrait.rawValue)
        } else {
            return Int(UIInterfaceOrientationMask.landscapeLeft.rawValue)
        }
    }

并在viewWillAppear的FIRST控制器中设置：

if let appDelegate = UIApplication.sharedApplication().delegate as? AppDelegate {
    appDelegate.shouldRotate = true
}

在我的SECOND控制器中：

if let appDelegate = UIApplication.sharedApplication().delegate as? AppDelegate {
    appDelegate.shouldRotate = false
}

所以，当我从SECOND控制器回到FIRST：

我向左旋转 - 不旋转，向后旋转 - 没有，向左旋转，再旋转 - 旋转。

我该如何解决？

Answer 1

要以swift 3 编程方式更改方向，请使用以下方法：

let value = UIInterfaceOrientation.landscapeRight.rawValue
UIDevice.current.setValue(value, forKey: "orientation")

您可以使用方向

<强> 1。肖像 2. portraitUpsideDown 3. landscapeLeft 4. landscapeRight

Answer 2

您可以覆盖UIViewController.supportedInterfaceOrientations()，而不是在viewWillAppear

中触发轮播

对于Xcode 7

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

对于Xcode 6

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

确保在项目设置中启用了所需的方向。

Answer 3

快捷键4：

第1步：

在Appdelegate中-声明deviceOrientation变量，默认情况下为portrait

import UIKit
let appDelegate = UIApplication.shared.delegate as! AppDelegate
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    var deviceOrientation = UIInterfaceOrientationMask.portrait
    func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
        return deviceOrientation
    }
}

第2步：

在您的特定ViewController中编写此代码以更改方向-

 override func viewWillAppear(_ animated: Bool) {
     appDelegate.deviceOrientation = .landscapeLeft
     let value = UIInterfaceOrientation.landscapeLeft.rawValue
     UIDevice.current.setValue(value, forKey: "orientation")
 } 

Answer 4

编辑：

可以修改它以实现方向的任意组合。

在AppDelegate中：

internal var viewControllerOrientation = 0
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    if viewControllerOrientation == 0 {
        return .portrait
    } else if viewControllerOrientation == 1 {
      return .landscapeLeft
    } else if viewControllerOrientation == 2 {
      return .landscapeRight
    }
}

LandscapeLeftViewController

视图控制器被锁定为landscapeLeft方向

override func viewDidAppear(_ animated: Bool) {
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.viewControllerOrientation = 1
}

@IBAction func newVCBtnWasPressed(_ sender: Any) {
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.viewControllerOrientation = 0

    // go to different view controller method, such as:
    dismiss(animated: true, completion: nil)
}

LandscapeRightViewController

视图控制器被锁定在landscapeRight方向

override func viewDidAppear(_ animated: Bool) {
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.viewControllerOrientation = 2
}

@IBAction func newVCBtnWasPressed(_ sender: Any) {
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.viewControllerOrientation = 0

    // go to different view controller method, such as:
    dismiss(animated: true, completion: nil)
}

所有其他视图控制器均锁定为纵向。同样，可以修改它以实现所需的锁定方向的任意组合。

Answer 5

迅速5

import UIKit

extension UIViewController {
    class func setUIInterfaceOrientation(_ value: UIInterfaceOrientation) {
        UIDevice.current.setValue(value.rawValue, forKey: "orientation")
    }
}