1、搭个界面

2、写代码

// // 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! } }

3、运行效果

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