Question

我正在编写iphone应用程序，我想要qr代码扫描。我有QR码库来扫描QR码。现在我想给我的iPhone应用程序提供二维码扫描界面。

在Android中，我可以使用SurfaceView来实现这一点，{{1}}是我们可以显示相机帧的视图。 iPhone中与surfaceview相同的iPhone有什么可用吗？如果是这样的话怎么做。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类并添加此代码

- (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;
}

您也可以参考以下链接：http://www.musicalgeometry.com/?p=821

Answer 2

自iOS 7以来，iOS中的QR代码检测功能很快就可以使用，其诀窍是告诉AVCaptureMetadataOutput实例检测类型为AVMetadataObjectTypeQRCode的对象。

实时相机预览（如果您仍想使用，则可访问像素）在iOS中很长一段时间，最简单的AVCaptureVideoPreviewLayer。

请点击此处查看示例http://www.appcoda.com/qr-code-reader-swift/

如何实现qr代码扫描iphone应用程序的摄像头视图层？

2 个答案: