如何在iOS objective-C中为vr应用程序并排显示相机的两个预览？

我试图为vr应用程序并排实现两个摄像机视图。 我在这个网站find了一些有用的信息：

如何同时显示2个相机预览？[对于纸板应用程序]

但我想如何创build与iOS？

我正在尝试与AVFoundation创build相同的行为。 这是我现在的代码

CameraViewController

#import <AVFoundation/AVFoundation.h> #import "CameraViewController.h" @interface CameraViewController () @property (strong, nonatomic) AVCaptureSession *captureSession; @property (strong, nonatomic) AVCaptureStillImageOutput *stillImageOutput; @property (strong, nonatomic) AVCaptureVideoPreviewLayer *previewLayerLeft; @property (strong, nonatomic) AVCaptureVideoPreviewLayer *previewLayerRight; @end @implementation CameraViewController #pragma mark - lazy instantiation - (AVCaptureSession *)captureSession { if (!_captureSession) _captureSession = [[AVCaptureSession alloc] init]; return _captureSession; } - (AVCaptureStillImageOutput *)stillImageOutput { if (!_stillImageOutput) _stillImageOutput = [[AVCaptureStillImageOutput alloc] init]; return _stillImageOutput; } - (AVCaptureVideoPreviewLayer *)previewLayerLeft { if (!_previewLayerLeft) _previewLayerLeft = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession]; return _previewLayerLeft; } - (AVCaptureVideoPreviewLayer *)previewLayerRight { if (!_previewLayerRight) _previewLayerRight = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession]; return _previewLayerRight; } #pragma mark - view controller's life cycle methods - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self.captureSession setSessionPreset:AVCaptureSessionPresetPhoto]; NSError *error; AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo] error:&error]; if ([self.captureSession canAddInput:deviceInput]) [self.captureSession addInput:deviceInput]; [self.previewLayerLeft setVideoGravity:AVLayerVideoGravityResizeAspect]; [self.previewLayerRight setVideoGravity:AVLayerVideoGravityResizeAspect]; CALayer *rootLayer = [self.view layer]; [rootLayer setMasksToBounds:YES]; NSLog(@"%@", NSStringFromCGRect([rootLayer frame])); if ([self.previewLayerLeft.connection isVideoOrientationSupported]) [self.previewLayerLeft.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight]; //home button on right. Refer to .h not doc [self.previewLayerLeft setFrame:CGRectMake(0, 0, [rootLayer frame].size.width / 2, [rootLayer frame].size.height)]; if ([self.previewLayerRight.connection isVideoOrientationSupported]) [self.previewLayerRight.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight]; //home button on right. Refer to .h not doc [self.previewLayerRight setFrame:CGRectMake([rootLayer frame].size.width / 2, 0, [rootLayer frame].size.width / 2, [rootLayer frame].size.height)]; [rootLayer insertSublayer:self.previewLayerLeft atIndex:0]; [rootLayer insertSublayer:self.previewLayerRight atIndex:1]; [self.stillImageOutput setOutputSettings:[[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil]]; if ([self.captureSession canAddOutput:self.stillImageOutput]) [self.captureSession addOutput:self.stillImageOutput]; [self.captureSession startRunning]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; } - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; }