二维码现在无处不在，今天就给大家分享下在Swift下如何实现二维码识别！
开发环境：Xcode8.2.1 iOS 10.0

说明：本实例为纯代码编写，核心功能代码如下

SCanViewController.swift

import UIKit
import AVFoundation

class SCanViewController: UIViewController ,AVCaptureMetadataOutputObjectsDelegate{

var setms = MessageView()
var session: AVCaptureSession!
  override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = UIColor.white
    //获取系统视频捕捉硬件设备
    let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
    do{
        //初始化视频捕设备
        let input = try AVCaptureDeviceInput(device: device)
        //初始化CaptureSessoin对象
        session = AVCaptureSession()
        //给Session添加输入设备
        session.addInput(input)
        //初始化CaptureMetadataOutput对象
        let output = AVCaptureMetadataOutput()
        //给session添加输出
        session.addOutput(output)
        //设置代理
        output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
        output.metadataObjectTypes = [AVMetadataObjectTypeQRCode]
        
        //设置视频捕捉图层
        let preview = AVCaptureVideoPreviewLayer(session: session)
        preview?.videoGravity = AVLayerVideoGravityResizeAspectFill
        preview?.frame = view.bounds
        view.layer.addSublayer(preview!)
        //开始视频捕捉
        session.startRunning()
        
        let qrbound = UIView()
        qrbound.layer.borderWidth = 2
        qrbound.layer.borderColor = UIColor.blue.cgColor
        qrbound.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
        qrbound.center = view.center
        view.addSubview(qrbound)
               
    }catch {
        print(error)
    }
    
    
}

//省略...

}

项目运行图片：

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