IOS Swift 开发QRCore(二维码)实例详解

// // ViewController.swift // GeneratorQRCode // // Created by targetcloud on 2016/12/3. // Copyright © 2016年 targetcloud. All rights reserved. //  import UIKit  class ViewController: UIViewController {   @IBOutlet weak var qrImg: UIImageView!   @IBOutlet weak var qrContent: UITextView!    @IBAction func generatorQRImg(_ sender: Any) {     view.endEditing(true)     let str = qrContent.text ?? ""          let filter = CIFilter(name: "CIQRCodeGenerator")     filter?.setDefaults()     let data = str.data(using: String.Encoding.utf8)     filter?.setValue(data, forKey: "inputMessage")     filter?.setValue("M", forKey: "inputCorrectionLevel")     var image = filter?.outputImage     let transform = CGAffineTransform(scaleX: 10, y: 10)//处理成为一个高清图片     image = image?.applying(transform)     var resultImage = UIImage(ciImage: image!)          let centerImg = UIImage(named: "targetcloud.png")     resultImage = mergeImage(resultImage, centerImg: centerImg!, drawSize:CGSize(width: 80, height: 80))     qrImg.image = resultImage   }      func mergeImage(_ sourceImage: UIImage, centerImg: UIImage,drawSize:CGSize) -> UIImage {     let size = sourceImage.size     UIGraphicsBeginImageContext(size)     sourceImage.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))     centerImg.draw(in: CGRect(x: (size.width - drawSize.width) * 0.5, y: (size.height - drawSize.height) * 0.5, width: drawSize.width, height: drawSize.height))     let resultImage = UIGraphicsGetImageFromCurrentImageContext()     UIGraphicsEndImageContext()     return resultImage!   } }