强制一个视图的ipad方向

Question

我试图强制一个视图在我的ipad应用程序的方向，但我无法保持它的持久性。

例如，我在我的收藏视图中显示肖像，我选择了一个图像（这是风景）。我检查它的宽度，并在我的viewPhoto的viewWillAppear中设置高度，以便将设备设置为横向。 “设备”旋转，以及。当我在人像后手动旋转它时，我希望它保持在横向，但不是。

这里是我的代码：

override func viewWillAppear(animated: Bool) { 
    // Remove hairline on toolbar 
    mytoolBar.clipsToBounds = true 

    // Load image from svg 
    let img = getImageFromBase64(arrayBase64Images[index]) 
    imgView.image = img 

    var value: Int 
    if (img.size.width > img.size.height) { // turn device to landscape 
     value = UIInterfaceOrientation.LandscapeRight.rawValue 
    } 
    else { // turn device to portrait 
     value = UIInterfaceOrientation.Portrait.rawValue 
    } 
    UIDevice.currentDevice().setValue(value, forKey: "orientation") 

} 

Answer 1

我修修补补这个解决方案，不正是我想要的，但它的工作：

override func viewWillAppear(animated: Bool) { 
    // Remove hairline on toolbar 
    mytoolBar.clipsToBounds = true 

    // Load image from svg 
    let img = getImageFromBase64(arrayBase64Images[index]) 
    imgView.image = img 

    var value: Int 

    if (img.size.width > img.size.height) { // turn device to landscape 
     if(!UIDeviceOrientationIsLandscape(UIDevice.currentDevice().orientation)) 
     { 
      value = UIInterfaceOrientation.LandscapeRight.rawValue 
      UIDevice.currentDevice().setValue(value, forKey: "orientation") 
     } 
     landscape = true 
    } 
    else { // turn device to portrait 
     if(!UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation)) 
     { 
      value = UIInterfaceOrientation.Portrait.rawValue 
      UIDevice.currentDevice().setValue(value, forKey: "orientation") 
     } 
     landscape = false 
    } 

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "rotated", name: UIDeviceOrientationDidChangeNotification, object: nil) 

} 

func rotated() 
{ 
    if(UIDeviceOrientationIsLandscape(UIDevice.currentDevice().orientation)) 
    { 
     if (!landscape) { 
      let value = UIInterfaceOrientation.Portrait.rawValue 
      UIDevice.currentDevice().setValue(value, forKey: "orientation") 
     } 
    } 

    if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation)) 
    { 
     if (landscape) { 
      let value = UIInterfaceOrientation.LandscapeRight.rawValue 
      UIDevice.currentDevice().setValue(value, forKey: "orientation") 
     } 
    } 
}