我正在尝试使用 iphone 上的后置摄像头AVCaptureDevice
。我都试过了AVCaptureDevicePositionBack
,AVCaptureDevicePositionFront
但无论如何它仍然使用 FrontCamera。
这是我的代码:
- (void)setupCamera
{
_captureDevice = nil;
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices)
{
if (device.position == AVCaptureDevicePositionBack)
{
_captureDevice = device;
break;
}
}
}
- (void)turnCameraOn
{
NSError *error;
_session = [[AVCaptureSession alloc] init];
[_session beginConfiguration];
[_session setSessionPreset:AVCaptureSessionPresetMedium];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:_captureDevice error:&error];
if (input == nil)
NSLog(@"%@", error);
[_session addInput:input];
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
[output setSampleBufferDelegate:self queue:dispatch_queue_create("myQueue", NULL)];
output.videoSettings = @{(id)kCVPixelBufferPixelFormatTypeKey:@(kCVPixelFormatType_32BGRA)};
output.alwaysDiscardsLateVideoFrames = YES;
[_session addOutput:output];
[_session commitConfiguration];
[_session startRunning];
}
- (void)turnCameraOff
{
[_session stopRunning];
_session = nil;
}