ios - 如何只为一个 Controller 解锁方向？

Question

如何仅解锁一个 Controller 的方向？我的整个应用程序只允许使用一种纵向模式，但仅在一种模式下我需要横向模式。为此，我尝试了下一个片段:

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

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

override func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation {
    return UIInterfaceOrientation.Portrait
}

但这对我没有帮助。还有其他解决办法吗？

Answer 1

在Appdelegate中定义一个var:

import UIKit
var isViewAppeared = false

现在在 Appdelegate 中:

func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> Int {
    if isViewAppeared{
      return Int(UIInterfaceOrientationMask.AllButUpsideDown.rawValue)
    }
    return Int(UIInterfaceOrientationMask.Portrait.rawValue)
  }

现在在 ViewController 中您想要横向的位置:

  override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    isViewAppeared = true

  }

  override func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    isViewAppeared = false

    UIView.animateWithDuration(0.4, animations: { () -> Void in
      let value = UIInterfaceOrientation.Portrait.rawValue
      UIDevice.currentDevice().setValue(value, forKey: "orientation")
    })

  }