强迫在风景的照相机视图与方向锁

Question

我正在开发一种增强现实游戏，当设备的方向锁定打开时，我遇到了摄像机视图方向的问题。

我正在使用此代码加载视图内的摄像机视图：

AVCaptureSession *session = [[AVCaptureSession alloc] init];
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.frame = self.sessionView.bounds;
[self.sessionView.layer addSublayer:captureVideoPreviewLayer];
CGRect bounds=sessionView.layer.bounds;
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
captureVideoPreviewLayer.bounds=bounds;
captureVideoPreviewLayer.orientation = [[UIDevice currentDevice] orientation];
captureVideoPreviewLayer.position=CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// device.position ;
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if ([device hasTorch]) {
    ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1280x720]);
}
else {
    ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset640x480]);
}
[session addInput:input];
[session startRunning];

为了确保应用程序的方向正确，我只选择了Xcode应用程序摘要中的那个框，其中包含：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return ((interfaceOrientation == UIInterfaceOrientationLandscapeRight));
}

当设备开启方向锁定（双击主页按钮，向右滑动，点击方向图标）时，摄像机视图将显示为纵向，其余部分处于横向状态。有没有什么办法解决这一问题？根据我所读到的内容，当用户打开游戏时，无法关闭方向锁定。

Answer 1

您的预览图层没有定位的原因是您使用了弃用的API，而且您没有在更改设备方向时更新视频方向。

1. 删除已弃用的API，即代码中的

   captureVideoPreviewLayer.orientation
   

   使用videoOrientation属性，即

   captureVideoPreviewLayer.connection.videoOrientation 
   

2. 更新shouldAutorotate中的视频方向，如下所示：

   - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
   {
   
       if(interfaceOrientation == UIInterfaceOrientationLandscapeRight)
       {
          captureVideoPreviewLayer.connection.videoOrientation = AVCaptureVideoOrientationLandscapeRight
       }
   
         // and so on for other orientations
   
       return ((interfaceOrientation == UIInterfaceOrientationLandscapeRight));
   }