如何在Swift中以编程方式旋转方向？ [英] How to rotate orientation programmatically in Swift?

问题描述

我尝试了下一个：

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

viewWillAppear

但不起作用。如何在viewWillAppear上旋转我的屏幕？

but it does not work. How can I rotate my screen on viewWillAppear?

更新

我使用的是下一个锁定方向的代码：

I use the next code for locking an orientation:

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)
        }
    }

和我在viewWillAppear的FIRST控制器中设置：

and in my FIRST controller in viewWillAppear I set:

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

：

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

所以，当我回来的时候从SECOND控制器到FIRST：

so, when I back from SECOND controller to the FIRST:

我将它旋转到左边 - 不旋转，向后旋转 - 没有，向左旋转，再旋转 - 它旋转。

I rotate it to left - does not rotate, rotate back to right - nothing, rotate to left, again - it rotates.

我该如何解决？

推荐答案

到在swift 3中以编程方式更改方向，使用以下方式：

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

您可以使用方向，

1。 portrait
2. portraitUpsideDown
3. landscapeLeft
4. landscapeRight

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