在UILabels後面設置背景攝像頭

Question

我一直在嘗試很長時間，無法讓它解決，但基本上我想在背景後面顯示實時攝像頭源標籤和按鈕。這裏是我正在使相機出現的代碼

- (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]; 

} 

我不知道如何將它放在視圖上的標籤後面加載。任何幫助將非常感激！

Answer 1

你只需要使用sendSubviewToBack

更多細節添加視圖在後臺，您可以檢查Apple AVCam Example

sendSubviewToBack： 移動指定的子視圖，使其顯示它的兄弟姐妹後面。

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

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

OR

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