二維碼---掃描 swift

swift 3.0 Xcode 8.1

須要在info.plist 添加 Privacy - Camera Usage Description YES

import UIKit
import AVFoundation
 
class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
   
    var session: AVCaptureSession!  //輸入輸出的中間橋樑
   
    var myInput: AVCaptureDeviceInput!  //建立輸入流
    var myOutput: AVCaptureMetadataOutput!  //建立輸出流
   
    var bgView = UIView()
    var barcodeView = UIView()
   
    var timer = Timer()
    var scanLine = UIImageView()
   
    override func viewDidLoad() {
        super.viewDidLoad()
       
        //設置定時器，延遲2秒啓動
        self.timer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(moveScannerLayer(_:)), userInfo: nil, repeats: true)
       
        //初始化連接對象
        self.session = AVCaptureSession.init()
        //設置高質量採集率
        self.session.canSetSessionPreset(AVCaptureSessionPresetHigh)
       
        //獲取攝像設備
        let device: AVCaptureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
       
        //捕捉異常，並處理
        do {
            self.myInput = try AVCaptureDeviceInput.init(device: device)
            self.myOutput = AVCaptureMetadataOutput.init()
            self.session.addInput(self.myInput)
            self.session.addOutput(self.myOutput)
        } catch {
            print("error")
        }
       
        //建立預覽視圖
        self.createBackGroundView()
       
        //設置掃描範圍(橫屏)
        self.myOutput.rectOfInterest = CGRect(x: 0.35, y: 0.2, width: UIScreen.main.bounds.width * 0.6 / UIScreen.main.bounds.height, height: 0.6)
      
        //設置掃碼支持的編碼格式(以下設置條形碼和二維碼兼容)
        myOutput.metadataObjectTypes = [AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code,  AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]
       
        //建立串行隊列
        let dispatchQueue = DispatchQueue(label: "queue", attributes: [])
        //設置輸出流的代理
        self.myOutput.setMetadataObjectsDelegate(self, queue: dispatchQueue)
       
        //建立預覽圖層
        let myLayer = AVCaptureVideoPreviewLayer.init(session: self.session)
        myLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill  //設置預覽圖層的填充方式
        myLayer?.frame = self.view.layer.bounds  //設置預覽圖層的frame
        self.bgView.layer.insertSublayer(myLayer!, at: 0)  //將預覽圖層(攝像頭畫面)插入到預覽視圖的最底部
       
        //開始掃描
        self.session.startRunning()
        self.timer.fire()
    }
   
   
    //掃描結果，代理
    func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
       
        if metadataObjects != nil && metadataObjects.count > 0 {
           
            //中止掃描
            self.session.stopRunning()
            timer.invalidate()
           
            //獲取第一個
            let metaData = metadataObjects.first as! AVMetadataMachineReadableCodeObject
            print(metaData.stringValue)
           
            DispatchQueue.main.async(execute: {
                //掃描到以後的操做
                //......
                print(metaData.stringValue)
            })
        }
    }
   
    //建立預覽視圖
    func createBackGroundView() {
       
        self.bgView.frame = UIScreen.main.bounds
        self.bgView.backgroundColor = UIColor.black
        self.view.addSubview(self.bgView)
       
        //灰色蒙版
        let topView = UIView(frame: CGRect(x: 0, y: 0,  width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height * 0.35))
       
        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))
       
        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))
       
        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)
       
        //文字說明
        let label = UILabel(frame: CGRect(x: 0, y: 10, width: UIScreen.main.bounds.size.width, height: 21))
        label.textAlignment = NSTextAlignment.center
        label.font = UIFont.systemFont(ofSize: 14)
        label.textColor = UIColor.white
        label.text = "將二維碼/條形碼放入掃描框內，即自動掃描"
        bottomView.addSubview(label)
       
        self.bgView.addSubview(topView)
        self.bgView.addSubview(bottomView)
        self.bgView.addSubview(leftView)
        self.bgView.addSubview(rightView)
       
       
        //屏幕中間掃描區域視圖（透明）
        barcodeView.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)
        barcodeView.backgroundColor = UIColor.clear
        barcodeView.layer.borderWidth = 1.0
        barcodeView.layer.borderColor = UIColor.white.cgColor
        self.bgView.addSubview(barcodeView)
       
        //掃描線
        scanLine.frame = CGRect(x: 0, y: 0, width: barcodeView.frame.size.width, height: 5)
        scanLine.image = UIImage(named: "QRCodeScanLine")
        barcodeView.addSubview(scanLine)
       
    }
   
    //掃描線滾動
    func moveScannerLayer(_ timer : Timer) {
        self.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)
        }
       
    }
 
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}