public override void ViewDidAppear(bool animated)
{
base.ViewDidAppear(animated);
if (!cameraView.IsRunning)
{
cameraView.Start();
}
}
private void Grid_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
if (this.IsLoaded && (sender as UIElement).Visibility == Visibility.Visible)
{
CameraView.Start();
}
else
{
CameraView.Stop();
}
}
public async Task StartCamera()
{
try
{
if (Device.RuntimePlatform == Device.UWP || !CanUseCamera)
{
return;
}
// Already have a camera?
if (CameraView != null)
{
if (!CameraView.EnablePreview)
{
CameraView.EnablePreview = true;
CameraView.Start();
}
CameraView.Camera.CaptureQuality = CaptureQuality.High;
return;
}
// Create the camera
CameraView = new CameraView()
{
BackgroundColor = ViewBackgroundColor
};
CameraView.CameraOptions.AutoRotateImage = true;
// Hook into the events
CameraView.PictureReceived += CameraView_PictureReceived;
// Listen for tap events
TapGestureRecognizer singleTapRecognizer = new TapGestureRecognizer()
{
NumberOfTapsRequired = 1
};
singleTapRecognizer.Tapped += CameraView_Tapped;
CameraView.GestureRecognizers.Add(singleTapRecognizer);
// Add the camera
await Device.InvokeOnMainThreadAsync(() => CameraContainer.Content = CameraView);
CameraView.Camera.CaptureQuality = CaptureQuality.High;
}
catch (Exception ex)
{
await DisplayAlert("Error", $"Unable to use camera: {ex.Message}", "OK");
}
}