swift -> 二维码扫描

参考： http://www.jianshu.com/p/203a48d64e71

代码： https://github.com/cirelir/2DBarcode

ViewController.swift

import UIKit


class ViewController: UIViewController{
  
    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "首页"
        
        let button = UIButton(frame: CGRect(x: (UIScreen.main.bounds.size.width-100) * 0.5, y: (UIScreen.main.bounds.size.height-30) * 0.5, width: 100, height: 30))
        button.setTitle("扫一扫", for: UIControlState())
        button.setTitleColor(UIColor.blue, for: UIControlState())
        button.addTarget(self, action: #selector(ViewController.buttonAction(_:)), for: UIControlEvents.touchUpInside)
        self.view.addSubview(button)
 
    }
    func buttonAction(_ sender : AnyObject){
        print("扫一扫")
        let  scanner = ScannerViewController()
        self.present(scanner, animated: true, completion: nil);
        //self.navigationController?.pushViewController(scanner, animated: true)
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    
    
}

ScannerViewController.swift

import UIKit
import AVFoundation

class ScannerViewController: UIViewController,AVCaptureMetadataOutputObjectsDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate {
    
    //相机显示视图
    let cameraView = ScannerBackgroundView(frame: UIScreen.main.bounds)
    
    
    let captureSession = AVCaptureSession()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //self.title = "扫一扫"
        self.view.backgroundColor = UIColor.black
        //设置导航栏
        /*let barButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.add, target: self, action: #selector(ScannerViewController.selectPhotoFormPhotoLibrary(_:)))
        self.navigationItem.rightBarButtonItem = barButtonItem*/
        let getFrmPhoto = UIButton(frame: CGRect(x: 10, y: 10, width: 200, height: 80));
        getFrmPhoto.backgroundColor = UIColor.red
        getFrmPhoto.setTitle("get From Photo", for: .normal)
        getFrmPhoto.addTarget(self, action: #selector(selectPhotoFormPhotoLibrary(_:)), for: .touchUpInside)
        self.view.addSubview(getFrmPhoto)
        //
        
        cameraView.frame.size.height -= 80;
        cameraView.frame.origin.y += 80;
        self.view.addSubview(cameraView)
        
        //初始化捕捉设备（AVCaptureDevice），类型AVMdeiaTypeVideo
        let captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
        
        let input :AVCaptureDeviceInput
        
        //创建媒体数据输出流
        let output = AVCaptureMetadataOutput()
        
        //捕捉异常
        do{
            //创建输入流
            input = try AVCaptureDeviceInput(device: captureDevice)
            
            //把输入流添加到会话
            captureSession.addInput(input)
            
            //把输出流添加到会话
            captureSession.addOutput(output)
        }catch {
            print("异常")
        }
        
        //创建串行队列
        let dispatchQueue = DispatchQueue(label: "queue", attributes: [])
        
        //设置输出流的代理
        output.setMetadataObjectsDelegate(self, queue: dispatchQueue)
        
        //设置输出媒体的数据类型
        output.metadataObjectTypes = NSArray(array: [AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]) as [AnyObject]
        
        //创建预览图层
        let videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        
        //设置预览图层的填充方式
        videoPreviewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
        
        //设置预览图层的frame
        videoPreviewLayer?.frame = cameraView.bounds
        
        //将预览图层添加到预览视图上
        cameraView.layer.insertSublayer(videoPreviewLayer!, at: 0)
        
        //设置扫描范围
        output.rectOfInterest = CGRect(x: 0.2, y: 0.2, width: 0.6, height: 0.6)
        
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.tabBarController?.tabBar.isHidden = true
        self.scannerStart()
    }
    
    func scannerStart(){
        captureSession.startRunning()
        cameraView.scanning = "start"
    }
    
    func scannerStop() {
        captureSession.stopRunning()
        cameraView.scanning = "stop"
    }
    
    
    //扫描代理方法
    func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
        print("_______")
        
        if metadataObjects != nil && metadataObjects.count > 0 {
            let metaData : AVMetadataMachineReadableCodeObject = metadataObjects.first as! AVMetadataMachineReadableCodeObject
            
            print(metaData.stringValue)
            
            DispatchQueue.main.async(execute: {
                print("相机扫描结果:")
                print(metaData.stringValue);
                //let result = WebViewController()
                //result.url = metaData.stringValue
                
                //self.navigationController?.pushViewController(result, animated: true)
            })
            captureSession.stopRunning()
        }
        
    }
    
    //从相册中选择图片
    func selectPhotoFormPhotoLibrary(_ sender : AnyObject){
        let picture = UIImagePickerController()
        picture.sourceType = UIImagePickerControllerSourceType.photoLibrary
        picture.delegate = self
        self.present(picture, animated: true, completion: nil)
        
    }
    
    //选择相册中的图片完成，进行获取二维码信息    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerOriginalImage]
        
        let imageData = UIImagePNGRepresentation(image as! UIImage)
        
        let ciImage = CIImage(data: imageData!)
        
        let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy: CIDetectorAccuracyLow])
        
        let array = detector?.features(in: ciImage!)
        
        let result : CIQRCodeFeature = array!.first as! CIQRCodeFeature
        
        print("从相册获取结果:");
        print(result.messageString ?? String())
        
    }
}

ScannerBackgroundView.swift

//
//  ScannerBackgroundView.swift
//  BDHome
//
//  Created by Erwin on 16/6/17.
//  Copyright © 2016年 BDHome. All rights reserved.
//

import UIKit

class ScannerBackgroundView: UIView {
    
    
    //屏幕扫描区域视图
    let barcodeView = UIView(frame: CGRect(x: UIScreen.main.bounds.size.width * 0.2, y: UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width * 0.6, height: UIScreen.main.bounds.size.width * 0.6))
    //扫描线
    let scanLine = UIImageView()
    
    var scanning : String!
    var timer = Timer()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        barcodeView.layer.borderWidth = 1.0
        barcodeView.layer.borderColor = UIColor.white.cgColor
        self.addSubview(barcodeView)
        
        //设置扫描线
        scanLine.frame = CGRect(x: 0, y: 0, width: barcodeView.frame.size.width, height: 5)
        scanLine.image = UIImage(named: "QRCodeScanLine")
        
        //添加扫描线图层
        barcodeView.addSubview(scanLine)
        
        self.createBackGroundView()
        
        self.addObserver(self, forKeyPath: "scanning", options: .new, context: nil)
        
        timer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(moveScannerLayer(_:)), userInfo: nil, repeats: true)
        
        
    }
    
    func  createBackGroundView() {
        let topView = UIView(frame: CGRect(x: 0, y: 0,  width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height * 0.35))
        let bottomView = UIView(frame: CGRect(x: 0, y: UIScreen.main.bounds.size.width * 0.6 + UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height * 0.65 - UIScreen.main.bounds.size.width * 0.6))
        
        let leftView = UIView(frame: CGRect(x: 0, y: UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width * 0.2, height: UIScreen.main.bounds.size.width * 0.6))
        let rightView = UIView(frame: CGRect(x: UIScreen.main.bounds.size.width * 0.8, y: UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width * 0.2, height: UIScreen.main.bounds.size.width * 0.6))
        
        topView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
        bottomView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
        leftView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
        rightView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
        
        let label = UILabel(frame: CGRect(x: 0, y: 10, width: UIScreen.main.bounds.size.width, height: 21))
        label.textAlignment = .center
        label.font = UIFont.systemFont(ofSize: 14)
        label.textColor = UIColor.white
        label.text = "将二维码/条形码放入扫描框内，即自动扫描"
        
        bottomView.addSubview(label)
        
        
        self.addSubview(topView)
        self.addSubview(bottomView)
        self.addSubview(leftView)
        self.addSubview(rightView)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        
        if scanning == "start" {
            timer.fire()
        }else{
            timer.invalidate()
        }
    }
    
    
    //让扫描线滚动
    func moveScannerLayer(_ timer : Timer) {
        scanLine.frame = CGRect(x: 0, y: 0, width: self.barcodeView.frame.size.width, height: 12);
        UIView.animate(withDuration: 2) {
            self.scanLine.frame = CGRect(x: self.scanLine.frame.origin.x, y: self.scanLine.frame.origin.y + self.barcodeView.frame.size.height - 10, width: self.scanLine.frame.size.width, height: self.scanLine.frame.size.height);
            
        }
        
    }
}

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