Create QRScanner.swift file
//
// QRScanner.swift
// NativeQR
//
// Created by Harvey on 2017/10/24.
// Copyright © 2017年 Harvey. All rights reserved.
//
import Foundation
import AVFoundation
import UIKit
class QRScanner: NSObject {
static let shared = QRScanner()
private let captureSession = AVCaptureSession()
private let videoPreviewLayer = AVCaptureVideoPreviewLayer()
private var handleCompleted: ((String) -> ())? = nil
private override init() {
super.init()
AVCaptureDevice.requestAccess(for: AVMediaType.video) { (isSuccess) in
if isSuccess {
self.prepare()
}else {
print("无权访问摄像机")
}
}
}
private func prepare() {
guard let device = AVCaptureDevice.default(for: .video) else {
print("获取摄像设备发生错误")
return
}
guard let deviceInput = try? AVCaptureDeviceInput(device: device) else {
print("创建设备输入流发生错误")
return
}
// 创建数据输出流
let metadataOutput = AVCaptureMetadataOutput()
metadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
// 创建设备输出流
let videoDataOutput = AVCaptureVideoDataOutput()
videoDataOutput.setSampleBufferDelegate(self, queue: DispatchQueue.main)
// 会话采集率: AVCaptureSessionPresetHigh
captureSession.sessionPreset = .high
// 添加数据输出流到会话对象
captureSession.addOutput(metadataOutput)
// 添加设备输出流到会话对象
captureSession.addOutput(videoDataOutput)
// 添加设备输入流到会话对象
captureSession.addInput(deviceInput)
// 设置数据输出类型
metadataOutput.metadataObjectTypes = [
.qr, // 二维码
.ean13, // 条形码
.ean8, // 条形码
.code128 // 条形码
]
videoPreviewLayer.session = captureSession
videoPreviewLayer.videoGravity = .resizeAspectFill
}
func scan(design: @escaping (_ previewLayer: CALayer)->()) -> Self {
design(videoPreviewLayer)
startRunning()
return self
}
func completed(aCompleted: @escaping (_ value: String)->()) {
self.handleCompleted = aCompleted
}
func startRunning() {
captureSession.startRunning()
}
func stopRunning() {
captureSession.stopRunning()
}
}
extension QRScanner: AVCaptureMetadataOutputObjectsDelegate {
func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
guard metadataObjects.count>0 else{
return
}
stopRunning()
guard let stringValue = metadataObjects.first!.value(forKey: "stringValue") as? String else {
return
}
handleCompleted?(stringValue)
}
}
extension QRScanner: AVCaptureVideoDataOutputSampleBufferDelegate {
func captureOutput(_ output: AVCaptureOutput, didDrop sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
}
}使用示例
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
QRScanner.shared
.scan { (previewLayer) in
/// 设置preview的frame
let width = UIScreen.main.bounds.size.width - 100
previewLayer.frame = CGRect(x: 50, y: 100, width: width, height: width)
self.view.layer.insertSublayer(previewLayer, at: 0)
// 你的扫描动画代码
// ......
// ......
}
.completed { (qrValue) in // 处理二维码
print(qrValue)
// 结束你的扫描动画代码
// ......
// ......
}
}代码及示例下载(有实现生成二维码)
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