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[英]How to override LayoutSublayersOfLayer behavior of Xamarin.IOS UIButton?
[英]UIButton are not visible over camera stream (Xamarin.iOS)
我制作了一个Xamarin.iOS应用程序,其中有一个摄像头流。 在我的情节提要中,我有一个用于拍照的UIButton和一个用于切换相机的UIButton。
但是,当我启动我的应用程序时,这些按钮位于相机流下方。
有人知道如何将按钮放置在摄像机流上吗?
这是我的代码
public override void ViewDidLoad()
{
base.ViewDidLoad();
liveCameraStream = PhotoView;
SetupLiveCameraStream();
}
public void SetupLiveCameraStream()
{
captureSession = new AVCaptureSession();
var viewLayer = liveCameraStream.Layer;
var videoPreviewLayer = new AVCaptureVideoPreviewLayer(captureSession)
{
Frame = liveCameraStream.Bounds
};
liveCameraStream.Layer.AddSublayer(videoPreviewLayer);
var captureDevice = AVCaptureDevice.DefaultDeviceWithMediaType(AVMediaType.Video);
ConfigureCameraForDevice(captureDevice);
captureDeviceInput = AVCaptureDeviceInput.FromDevice(captureDevice);
var dictionary = new NSMutableDictionary();
dictionary[AVVideo.CodecKey] = new NSNumber((int)AVVideoCodec.JPEG);
stillImageOutput = new AVCaptureStillImageOutput()
{
OutputSettings = new NSDictionary()
};
captureSession.AddOutput(stillImageOutput);
captureSession.AddInput(captureDeviceInput);
captureSession.StartRunning();
}
这里liveCameraStream
View悬停在Button上方,因此我们必须将其发送回View Hierarchy中,以便可以查看Button。
以下任何一项都可以为您工作:
// 1
UIView cameraView = new UIView(videoPreviewLayer.Frame);
cameraView.Layer.AddSublayer(videoPreviewLayer);
View.AddSubview(cameraView);
View.SendSubviewToBack(cameraView);
-------OR-------
// 2
liveCameraStream.Layer.AddSublayer(videoPreviewLayer);
View.SendSubviewToBack(liveCameraStream);
将以下行替换为以上代码行:
liveCameraStream.Layer.AddSublayer(videoPreviewLayer);
编辑:
第二个选项适用于此职位。
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