在 UILabel 后面设置背景摄像头

Question

我已经尝试了很长时间，但无法解决，但基本上我想在我的标签和按钮后面的背景中显示实时摄像机源。这是我正在使用的使相机出现的代码

   - (void)viewDidLoad {
    [super viewDidLoad];

    AVCaptureSession *session = [[AVCaptureSession alloc] init];
    session.sessionPreset = AVCaptureSessionPresetHigh;

    AVCaptureDevice *device = [AVCaptureDevice  defaultDeviceWithMediaType:AVMediaTypeVideo];

    NSError *error = nil;
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
    [session addInput:input];

    AVCaptureVideoPreviewLayer *newCaptureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
    newCaptureVideoPreviewLayer.frame = self.view.bounds;

    [self.view addSublayer:newCaptureVideoPreviewLayer.view];
    [self.view sendSubviewToBack:newCaptureVideoPreviewLayer.view];

    [session startRunning];

}

我不知道如何将它放在视图上的标签后面确实加载了。任何帮助将不胜感激！

Answer 1

您只需要使用sendSubviewToBack在后台添加视图

更多详情可以查看Apple AVCam Example

sendSubviewToBack: 移动指定的子视图，使其出现在其兄弟视图的后面。

AVCaptureVideoPreviewLayer *newCaptureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
newCaptureVideoPreviewLayer.frame = self.view.bounds;

[self.view.layer addSublayer:newCaptureVideoPreviewLayer];
[session startRunning];

或

[[self.view superView] insertSubview:newCaptureVideoPreviewLayer belowSubview:self.view];