iOS中的雙攝像頭輸出

Question

我想使用iOS上的內置攝像頭製作雙屏幕我試過下面的代碼，但它只顯示一個視圖。

這是一個自然的結果，我知道。

下面是我用什麼代碼..

- (void)prepareCameraView:(UIView *)window 
{ 
    AVCaptureSession *session = [[AVCaptureSession alloc] init]; 
    session.sessionPreset = AVCaptureSessionPresetMedium; 

    CALayer *viewLayer = window.layer; 
    NSLog(@"viewLayer = %@", viewLayer); 

    AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] 
                  initWithSession:session]; 
    captureVideoPreviewLayer.frame = window.bounds; 
    [window.layer addSublayer:captureVideoPreviewLayer];  
    AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; 

    NSError *error = nil; 
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error]; 
    if (!input) 
    { 
     NSLog(@"ERROR : trying to open camera : %@", error); 
    } 

    [session addInput:input]; 

    [session startRunning]; 
} 

？我怎樣才能在iOS雙屏？

Answer 1

試試這個：

- (void)prepareCameraView:(UIView *)window 
{ 
    NSArray *captureDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; 

    { 
     AVCaptureSession *session = [[AVCaptureSession alloc] init]; 
     session.sessionPreset = AVCaptureSessionPresetMedium; 

     CALayer *viewLayer = window.layer; 
     NSLog(@"viewLayer = %@", viewLayer); 

     AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session]; 
     captureVideoPreviewLayer.frame = CGRectMake(0.0f, 0.0f, window.bounds.size.width/2.0f, window.bounds.size.height); 
     [window.layer addSublayer:captureVideoPreviewLayer]; 

     NSError *error = nil; 
     AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:[captureDevices objectAtIndex:0] error:&error]; 
     if (!input) 
     { 
      NSLog(@"ERROR : trying to open camera : %@", error); 
     } 

     [session addInput:input]; 

     [session startRunning]; 
    } 

    { 
     AVCaptureSession *session = [[AVCaptureSession alloc] init]; 
     session.sessionPreset = AVCaptureSessionPresetMedium; 

     CALayer *viewLayer = window.layer; 
     NSLog(@"viewLayer = %@", viewLayer); 

     AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session]; 
     captureVideoPreviewLayer.frame = CGRectMake(window.bounds.size.width/2.0f, 0.0f, window.bounds.size.width/2.0f, window.bounds.size.height); 
     [window.layer addSublayer:captureVideoPreviewLayer]; 

     NSError *error = nil; 
     AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:[captureDevices objectAtIndex:1] error:&error]; 
     if (!input) 
     { 
      NSLog(@"ERROR : trying to open camera : %@", error); 
     } 

     [session addInput:input]; 

     [session startRunning]; 
    } 

} 

注意，它使絕對沒有檢查實際上有2個攝像頭並將其拆分其垂直所以這在景觀可能是最好的觀察。您需要在該代碼中添加一些檢查，並在使用之前確定您想要如何佈置每個攝像頭的圖層。