在Xcode中设置前置摄像头

在Xcode中设置前置摄像头。 我怎样才能做到这一点？ 在Xcode中设置前置摄像头。

AVCaptureSession *session = [AVCaptureSession new]; if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) [session setSessionPreset:AVCaptureSessionPreset640x480]; else [session setSessionPreset:AVCaptureSessionPresetPhoto]; AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error]; require( error == nil, bail ); isUsingFrontFacingCamera = NO; if ( [session canAddInput:deviceInput] ) [session addInput:deviceInput]; stillImageOutput = [AVCaptureStillImageOutput new]; [stillImageOutput addObserver:self forKeyPath:@"capturingStillImage" options:NSKeyValueObservingOptionNew context:AVCaptureStillImageIsCapturingStillImageContext]; if ( [session canAddOutput:stillImageOutput] ) [session addOutput:stillImageOutput]; 

Answer 1

添加此方法来遍历现有的设备检查其位置：

 - (AVCaptureDevice *)frontCamera { NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; for (AVCaptureDevice *device in devices) { if ([device position] == AVCaptureDevicePositionFront) { return device; } } return nil; } 

然后，replace：

 AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; 

有：

 AVCaptureDevice *device = [self frontCamera]; 

Answer 2

 **.h file @interface ViewController : UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate> .m File -(IBAction)Btn_Ok:(id)sender { if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Device has no camera" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; [myAlertView show]; } else { UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.allowsEditing = YES; picker.sourceType = UIImagePickerControllerSourceTypeCamera; picker.cameraDevice=UIImagePickerControllerCameraDeviceFront; [self presentViewController:picker animated:YES completion:NULL]; } } - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *chosenImage = info[UIImagePickerControllerEditedImage]; self.yourimg.image = chosenImage; [picker dismissViewControllerAnimated:YES completion:NULL]; } - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [picker dismissViewControllerAnimated:YES completion:NULL]; } 

Answer 3

由于iOS 10 devicesWithMediaType:已被弃用。 你应该使用AVCAptureDeviceDiscoverySession 。

 - (AVCaptureDevice *)frontCamera { return [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[ AVCaptureDeviceTypeBuiltInWideAngleCamera ] mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionFront].devices.firstObject; }