如何实现二维码扫描iphone应用的摄像头视图层？

Question

我正在写iphone应用程序，我想扫描二维码。我有二维码库来扫描二维码。现在我想给我的iPhone应用程序提供二维码扫描接口。

在安卓系统中，我可以使用SurfaceView来实现这一点，这是我们可以显示相机帧的视图。在Android中，有没有什么东西可以和iPhone中的surfaceview等价物呢？如果是这样，如何做到这一点。请给我一个教程或示例链接。

Answer 1

- (IBAction)TakePicture:(id)sender {

// Create image picker controller
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

// Set source to the camera
imagePicker.sourceType =  UIImagePickerControllerSourceTypeCamera;

    // Delegate is self
    imagePicker.delegate = self;

    OverlayView *overlay = [[OverlayView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];     

    // Insert the overlay:
    imagePicker.cameraOverlayView = overlay;

   // Allow editing of image ?
    imagePicker.allowsImageEditing = YES;
    [imagePicker setCameraDevice:
    UIImagePickerControllerCameraDeviceFront];
    [imagePicker setAllowsEditing:YES];
    imagePicker.showsCameraControls=YES;
    imagePicker.navigationBarHidden=YES;
    imagePicker.toolbarHidden=YES;
    imagePicker.wantsFullScreenLayout=YES;

    self.library = [[ALAssetsLibrary alloc] init];

    // Show image picker
    [self presentModalViewController:imagePicker animated:YES];
}

创建一个UIView类并添加以下代码

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code


        // Clear the background of the overlay:
        self.opaque = NO;
        self.backgroundColor = [UIColor clearColor];

        // Load the image to show in the overlay:
        UIImage *overlayGraphic = [UIImage imageNamed:@"overlaygraphic.png"];
        UIImageView *overlayGraphicView = [[UIImageView alloc] initWithImage:overlayGraphic];
        overlayGraphicView.frame = CGRectMake(30, 100, 260, 200);
        [self addSubview:overlayGraphicView];

    }
    return self;
}

您也可以访问此链接：http://www.musicalgeometry.com/?p=821

Answer 2

从iOS 7开始，二维码检测在iOS中很容易使用，诀窍是告诉AVCaptureMetadataOutput实例检测类型为AVMetadataObjectTypeQRCode的对象。

实时相机预览(如果你仍然想使用它，可以访问像素)在iOS中已经有很长一段时间了，使用AVCaptureVideoPreviewLayer最容易。

有关http://www.appcoda.com/qr-code-reader-swift/示例，请参阅此处