我正在开发一个 iPhone 应用程序。其中，有暂停和恢复相机的要求。所以我使用AVFoundation它而不是使用UIImagePickerController.
我的代码是：
- (void) startup :(BOOL)isFrontCamera
{
if (_session == nil)
{
NSLog(@"Starting up server");
self.isCapturing = NO;
self.isPaused = NO;
_currentFile = 0;
_discont = NO;
// create capture device with video input
_session = [[AVCaptureSession alloc] init];
AVCaptureDevice *cameraDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if(isFrontCamera)
{
NSArray *videoDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
AVCaptureDevice *captureDevice = nil;
for (AVCaptureDevice *device in videoDevices)
{
if (device.position == AVCaptureDevicePositionFront)
{
captureDevice = device;
break;
}
}
cameraDevice = …