ios - 强制 ipad 方向为一个 View

Question

我试图在我的 iPad 应用程序中强制确定一个 View 的方向，但我无法保持它的持久性。

例如，我在收藏 View 中处于纵向，我选择一个图像(横向)。我在 viewPhoto 的 viewWillAppear 中检查它的宽度和高度，以便将设备设置为横向。 “设备”旋转，好吧。当我在纵向后手动旋转它时，我希望它保持横向，但事实并非如此。

这是我的代码:

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

我修改了这个解决方案，不完全是我想要的，但它完成了工作:

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")
        }
    }
}