private static void TurnOffFlashAndSetContinuousAutoMode(AVCaptureDevice device)
{
device.LockForConfiguration(out var error);
if (error != null)
{
return;
}
if (device.IsFlashModeSupported(AVCaptureFlashMode.Off))
{
device.FlashMode = AVCaptureFlashMode.Off;
}
if (device.IsFocusModeSupported(AVCaptureFocusMode.ContinuousAutoFocus))
{
device.FocusMode = AVCaptureFocusMode.ContinuousAutoFocus;
}
if (device.IsExposureModeSupported(AVCaptureExposureMode.ContinuousAutoExposure))
{
device.ExposureMode = AVCaptureExposureMode.ContinuousAutoExposure;
}
if (device.IsWhiteBalanceModeSupported(AVCaptureWhiteBalanceMode.ContinuousAutoWhiteBalance))
{
device.WhiteBalanceMode = AVCaptureWhiteBalanceMode.ContinuousAutoWhiteBalance;
}
device.UnlockForConfiguration();
}
static void SetFlashModeForDevice(AVCaptureFlashMode flashMode, AVCaptureDevice device)
{
if (device.HasFlash && device.IsFlashModeSupported(flashMode))
{
NSError error;
if (device.LockForConfiguration(out error))
{
device.FlashMode = flashMode;
device.UnlockForConfiguration();
}
else
{
Console.WriteLine("Could not lock device for configuration: {0}", error);
}
}
}
/// <summary>
/// Sets the device's flash settings
/// </summary>
/// <returns><see cref="T:ChilliSource.Mobile.Core.OperationResult"/> instance indicating the outcome of the operation</returns>
/// <param name="device">Device.</param>
/// <param name="flashMode">Flash mode.</param>
public static OperationResult SetFlashMode(this AVCaptureDevice device, AVCaptureFlashMode flashMode)
{
if (device.HasFlash && device.IsFlashModeSupported(flashMode))
{
NSError error;
if (device.LockForConfiguration(out error))
{
device.FlashMode = flashMode;
device.UnlockForConfiguration();
return(OperationResult.AsSuccess());
}
else
{
return(OperationResult.AsFailure(string.Format("Could not lock device for configuration: {0}", error)));
}
}
else
{
return(OperationResult.AsSuccess());
}
}
static void SetFlashModeForDevice (AVCaptureFlashMode flashMode, AVCaptureDevice device)
{
if (device.HasFlash && device.IsFlashModeSupported (flashMode)) {
NSError error;
if (device.LockForConfiguration (out error)) {
device.FlashMode = flashMode;
device.UnlockForConfiguration ();
} else {
Console.WriteLine ("Could not lock device for configuration: {0}", error);
}
}
}
private async void SnapStillImage()
{
//
if ((m_videoDevice != null) && (m_stillImageOutput != null))
{
if (m_videoDevice.HasFlash && m_videoDevice.IsFlashModeSupported(AVCaptureFlashMode.Auto))
{
NSError error;
if (m_videoDevice.LockForConfiguration(out error))
{
m_videoDevice.FlashMode = AVCaptureFlashMode.Auto;
m_videoDevice.UnlockForConfiguration();
}
}
AVCaptureConnection connection = m_stillImageOutput.ConnectionFromMediaType(AVMediaType.Video);
var imageDataSampleBuffer = await m_stillImageOutput.CaptureStillImageTaskAsync(connection); //获得当前帧的压缩图像
var imageData = AVCaptureStillImageOutput.JpegStillToNSData(imageDataSampleBuffer); //得到当前帧压缩图像的图像数据...
//RequestAuthorization(handler), handler是用户与权限对话框交互后，执行的动作。
PHPhotoLibrary.RequestAuthorization(status => {
if (status == PHAuthorizationStatus.Authorized)
{ // 若用户授权了
// To preserve the metadata, we create an asset from the JPEG NSData representation.
// Note that creating an asset from a UIImage discards the metadata.
// In iOS 9, we can use AddResource method on PHAssetCreationRequest class.
// In iOS 8, we save the image to a temporary file and use +[PHAssetChangeRequest creationRequestForAssetFromImageAtFileURL:].
if (UIDevice.CurrentDevice.CheckSystemVersion(9, 0))
{
//PHPhotoLibrary.SharedPhotoLibrary 返回的是一个(共享)图片库对象
//PerformChanges (changeHandler, completionHandler) changeHandler 以及 completionHandler 是一个lambda
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() => {
var request = PHAssetCreationRequest.CreationRequestForAsset();
request.AddResource(PHAssetResourceType.Photo, imageData, null); //保存当前照片
}, (success, err) => {
if (!success)
{
Console.WriteLine("Error occurred while saving image to photo library: {0}", err);
}
});
}
else
{ //用户没有授权
string outputFileName = NSProcessInfo.ProcessInfo.GloballyUniqueString;
string tmpDir = Path.GetTempPath();
string outputFilePath = Path.Combine(tmpDir, outputFileName);
string outputFilePath2 = Path.ChangeExtension(outputFilePath, "jpg");
NSUrl temporaryFileUrl = new NSUrl(outputFilePath2, false);
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() => {
NSError error = null;
if (imageData.Save(temporaryFileUrl, NSDataWritingOptions.Atomic, out error))
{
PHAssetChangeRequest.FromImage(temporaryFileUrl);
}
else
{
Console.WriteLine("Error occured while writing image data to a temporary file: {0}", error);
}
}, (success, error) => {
if (!success)
{
Console.WriteLine("Error occurred while saving image to photo library: {0}", error);
}
// Delete the temporary file.
NSError deleteError;
NSFileManager.DefaultManager.Remove(temporaryFileUrl, out deleteError);
});
}
}
});
}
}