swift - 如何使用 Swift 扫描 UIImage 中的二维码

Question

我正在尝试使用 Swift 从静态图像中读取 QR 码。

我可以使用视频源轻松阅读它，尽管图像看起来非常不同，而且我在网上找不到太多资源。

感谢任何帮助，谢谢。

Answer 1

您可以使用 ZXingObjC 制作出色的 QRCode 扫描器.它是一个条形码图像处理库，设计用于 iOS 设备和 Mac 应用程序。它从实时视频或照片库中的图像进行扫描，并支持所有主要的 QRCode 格式。

这只是为了让您朝着正确的方向开始。您将需要更多方法来设置相机等。ZXingObjC 包含示例项目，并且整个 SO 都有相机设置解决方案，所以这非常简单。

当然，您需要安装 ZXingObjC pods pod 'ZXingObjC' 并创建一个 bridging-header.h 文件才能使用 ZXingObjC 库.

ViewController.swift

import UIKit
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet weak var labelOutput: UILabel!
@IBOutlet weak var QRImage: UIImageView!

var imagePicker = UIImagePickerController()

// imagePicker delegate is itself (UIImagePickerController)
override func viewDidLoad() {
    super.viewDidLoad()
    imagePicker.delegate = self
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

@IBAction func scanQRCode(sender: AnyObject) {
    imagePicker.sourceType = .PhotoLibrary
    imagePicker.allowsEditing = false
    presentViewController(imagePicker, animated: true, completion: nil)
}

// set up the picker
// initialize luminance source, scanning algorithm, decoding of bitmap, reader helpers, decoder
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    let placeHolderImage:UIImage = info[UIImagePickerControllerOriginalImage] as! UIImage
    QRImage.contentMode = .ScaleAspectFit
    QRImage.image = placeHolderImage
    dismissViewControllerAnimated(true, completion: nil)

    let luminanceSource: ZXLuminanceSource = ZXCGImageLuminanceSource(CGImage: placeHolderImage.CGImage)
    let binarizer = ZXHybridBinarizer(source: luminanceSource)
    let bitmap = ZXBinaryBitmap(binarizer: binarizer)
    let hints: ZXDecodeHints = ZXDecodeHints.hints() as! ZXDecodeHints
    let QRReader = ZXMultiFormatReader()

    // throw/do/catch and all that jazz
    do {
        let result = try QRReader.decode(bitmap, hints: hints)
        labelOutput.text = result.text
    } catch let err as NSError {
        print(err)
    }
}

// Conform to ZXCaptureDelegate
func captureResult(capture: ZXCapture!, result: ZXResult!) {
    // do some stuff
    return
 }
}

One note: As of this post there is a known initializer error in the library's ZXParsedResult.m file. After installing the library the location of the file in Xcode is: Project -> Pods -> ZXingObjC -> All -> ZXParsedResult.m

第 29 行更改 Objective-C 代码

+ (id)parsedResultWithType:(ZXParsedResultType)type {
return [[self alloc] initWithType:type];
}

到

+ (id)parsedResultWithType:(ZXParsedResultType)type {
return [(ZXParsedResult *)[self alloc] initWithType:type];
}