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：
3659416-7fc9f98b66bcba00.png
3659416-2bb5e8905078c284.png
3659416-e0d1bae84207b29f.png
源代码地址：https://github.com/pkx0128/QRCode
注：项目需真机测试
