为一个视图强制 ipad 方向

Question

我试图在我的 ipad 应用程序中强制显示一个视图的方向，但我无法保持它的持久性。

例如，我在 collection 视图中是纵向的，我 select 图像（横向）。我在我的 viewPhoto 的 viewWillAppear 中检查它的宽度和高度，以便将设备设置为横向。 "device" 旋转，嗯。当我手动旋转它到纵向后，我希望它保持横向，但它没有。

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，虽然不是我想要的，但它确实起作用了：

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")
        }
    }
}

为一个视图强制 ipad 方向

Force ipad orientation for one view

ipad

ios

swift