swift生成二维码，扫描二维码

墨蓝 2022-09-25 13:19 520阅读 0赞

～～～写在前面的话～～～

我之前打算做一个APP，然后把电话号码生成二维码 或者条形码， 用手机扫描，这样，就不用担心会输入错误电话号码了。

在下面是实现的扫描二维码的功能中，扫描完成，将会把扫描到的号码 拨打出去。～～～

关于应用之间的切换，参考链接：

[http://blog.sina.com.cn/s/blog\_7ea0400d0102uy01.html][http_blog.sina.com.cn_s_blog_7ea0400d0102uy01.html]

～～CSDN不知道怎么了，贴代码的地方不能有横向的滚动条了，不过，可以用下面的方法查看到具体代码呢～～

![Center][]

－－－－－－－－－－－－我是分割线－－－－－－－－－－－－－－

基于AVFoundation实现的。

1、效果图

生成界面

![Center 1][]

扫描界面：

![Center 2][]

2、环境

ios9.3.2

Xcode7.3(swift 3)

3、生成二维码

～～新建项目～～

A、新建文件：QRCode View.swift , 该文件主要用来生成二维码

B、该文件源码内容如下：

import UIKit
    
    /// 生成二维码
    class QRCodeView: UIView
    {
        /**
         - logo
         - parameter surperImage: 二维码
         - parameter subImage:    logo
         - parameter postRext:    logo位置
         - returns: 返回加上logo的图片
         */
        private func imageViewAddImage(surperImage: UIImage, subImage: UIImage, postRect:CGRect) -> UIImage
        {
             创建图像
            UIGraphicsBeginImageContext(surperImage.size);
            
             设置坐标
            surperImage.drawInRect(CGRect(x:0, y:0, width: surperImage.size.width, height: surperImage.size.height));
            
            surperImage.drawInRect(postRect);
            
             返回一个图像基于当前位图图形
            let newImage = UIGraphicsGetImageFromCurrentImageContext();
            
             移除当前位图图形
            UIGraphicsEndImageContext();
            
            return newImage;
        }
        
        /**
         调整大小
         - parameter ciImage: 待改变的image
         - parameter width:   设置比例系数
         - returns: 设置比例后的图片
         */
        private func SetSize(ciImage: CIImage, _width:CGFloat) -> UIImage
        {
            let extent = CGRectIntegral(ciImage.extent);
            let scale = min(_width / CGRectGetWidth(extent), _width / CGRectGetHeight(extent));
            
            let width = CGRectGetWidth(extent) * scale;
            let height = CGRectGetHeight(extent) * scale;
            
            let cs = CGColorSpaceCreateDeviceGray();
            let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.None.rawValue);
            
            let bitmapRef = CGBitmapContextCreate(nil, Int(width), Int(height), 8, 0, cs, bitmapInfo.rawValue);
            
            let context = CIContext(options: [kCIContextUseSoftwareRenderer:(true)]);
            let bitmapImage = context.createCGImage(ciImage, fromRect: extent);
            
            CGContextSetInterpolationQuality(bitmapRef, CGInterpolationQuality.None)
            CGContextScaleCTM(bitmapRef, scale, scale)
            CGContextDrawImage(bitmapRef, extent, bitmapImage);
            
            let scaledImage = CGBitmapContextCreateImage(bitmapRef);
            
            return UIImage(CGImage: scaledImage!);
        }
        
        
        /**
         截取logo边角
         - parameter cornerRadius: 截取度
         - parameter image:        需要截取边角的图片
         - returns: 截取边角后的图片
         */
        private func ImageAfterCutOutCorner(cornerRadius:CGFloat, image:UIImage) -> UIImage
        {
            let frame = CGRectMake(0, 0, image.size.width, image.size.height);
            UIGraphicsBeginImageContextWithOptions(image.size, false, 1.0);
            UIBezierPath.init(roundedRect:frame, cornerRadius: cornerRadius).addClip();
            image.drawInRect(frame);
            let im = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
            
            return im;
        }
        
        /**
         生成二维码
         - parameter urlString:    电话号码
         - parameter surperView:   image View
         - parameter logo:         logo的位置
         - parameter logoSize:     logo的大小
         - parameter cornerRadius: 边角裁剪度 
         - returns: 二维码
         */
        class func GenerateQRCode(urlString:String, surperView:UIView, logo:UIImage, logoSize:CGSize, cornerRadius: CGFloat) -> QRCodeView
        {
            let qrCodeView = QRCodeView();
            
            qrCodeView.frame = CGRect(x: 0, y: 0, width: surperView.frame.size.width, height: surperView.frame.size.height);
             该参数代表二维码不可改变
            let filter = CIFilter.init(name: "CIQRCodeGenerator");
            filter?.setDefaults();
            filter?.setValue(urlString.dataUsingEncoding(NSUTF8StringEncoding), forKey: "inputMessage"); //inputMessage 固定写法，代表输入信息 的意思
            let ciImage = filter?.outputImage;
            
            let QRImage = qrCodeView.SetSize(ciImage!, _width: surperView.frame.width);
            
            var cornerRadius_1 = cornerRadius;
            if (!logo.isEqual(nil))
            {
                if (cornerRadius_1 < 0)
                {
                    cornerRadius_1 = 0;
                }
            }
            qrCodeView.layer.contents = QRImage.CGImage;
            surperView.addSubview(qrCodeView);
            
            return qrCodeView;
        }
    }

二维码创建好了，接下来就是调用了  
C、在ViewController.swift 文件中调用。

D、在main.storyboard中添加控件：

![Center 3][]

E、在viewcontroller.swift 做关联：

![Center 4][]

F、同理，在 viewcontroller.swift 关联按钮的事件

![Center 5][]

G、关联完成，接着就在viewcontroller.swift中调用创建二维码了

生成二维码，当然是写在这个按钮下啦。 在 F 的函数中写上如下代码：

/**
         生成按钮
         - parameter sender: nothing
         */
        @IBAction func BtnGenerateQRCode(sender: UIButton)
        {
            label.text = "";
            if (textField.text == "")
            {
                label.font = UIFont.systemFontOfSize(20);
                label.text = "电话号码不能为空";
                return;
            }
        
            textField.resignFirstResponder();/// 取消焦点
            // 生成二维码
            QRCodeView.GenerateQRCode(textField.text!, surperView: imageView, logo: UIImage(named: "logo")!, logoSize: CGSizeMake(100, 100), cornerRadius: CGFloat(1000));
            
        }

同时，在ViewDidLoad方法中写上代码，设置控件属性

/**
         窗口加载
         */
        override func viewDidLoad()
        {
            super.viewDidLoad();
            
        
            label.adjustsFontSizeToFitWidth = true;// 设置自适应
            label.text = "";       /// 清空
            
            
            // Do any additional setup after loading the view, typically from a nib.
        }

OK，二维码生成完成～～～

下面是 viewcontroller.swift 的详细源码：

//
    //  ViewController.swift
    //  GenerateQRCode
    //
    //  Created by driver on 16/9/7.
    //  Copyright © 2016年 driver. All rights reserved.
    //
    
    import UIKit
    
    class ViewController: UIViewController {
        /// 提示label
        @IBOutlet weak var label: UILabel!
        /// 二维码显示框
        @IBOutlet weak var imageView: UIImageView!
        /// 电话号码输入框
        @IBOutlet weak var textField: UITextField!
    
        /**
         窗口加载
         */
        override func viewDidLoad()
        {
            super.viewDidLoad();
            
        
            label.adjustsFontSizeToFitWidth = true;// 设置自适应
            label.text = "";       /// 清空
            
            
            // Do any additional setup after loading the view, typically from a nib.
        }
        
        /**
         生成按钮
         - parameter sender: nothing
         */
        @IBAction func BtnGenerateQRCode(sender: UIButton)
        {
            label.text = "";
            if (textField.text == "")
            {
                label.font = UIFont.systemFontOfSize(20);
                label.text = "电话号码不能为空";
                return;
            }
        
            textField.resignFirstResponder();/// 取消焦点
            // 生成二维码
            QRCodeView.GenerateQRCode(textField.text!, surperView: imageView, logo: UIImage(named: "logo")!, logoSize: CGSizeMake(100, 100), cornerRadius: CGFloat(1000));
            
        }
    
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
    
    
    }

／／／－－－－－我是分割线－－－－－－－－－－－－－－－－－－－－

4、扫描二维码

～～～～ 新建项目～～～

A、扫描，就是在main.storyboard 中添加一个控件：按钮， 然后关联其touch事件。

B、在 Viewcontroller.swift 中，导入的库：

import UIKit
    import AVFoundation

C、

ViewController类继承的有：

UIViewController, AVCaptureMetadataOutputObjectsDelegate

代码：

class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate

D、viewcontroller类 定义的属性有：

定义属性
        var session: AVCaptureSession?;
        var layer: AVCaptureVideoPreviewLayer?;

E、viewDidLoad方法中添加代码：

super.viewDidLoad();
            ///self.view.backgroundColor = UIColor.lightGrayColor();
            self.modalPresentationStyle = .Custom;

F、在自己关联的按钮事件函数，源码如下：

扫描
        @IBAction func scanQRcode(sender: AnyObject)
        {
            self.session = AVCaptureSession();
            
             
            let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo);
            do
            {
                let input = try AVCaptureDeviceInput(device: device);
                
                if (self.session!.canAddInput(input))
                {
                    self.session!.addInput(input);
                }
                
                输出
                let output = AVCaptureMetadataOutput();
                output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue());
                
                if (self.session!.canAddOutput(output))
                {
                    self.session!.addOutput(output)
                    output.metadataObjectTypes = [AVMetadataObjectTypeQRCode];
                }
                
                添加图层
                self.layer = AVCaptureVideoPreviewLayer(session:self.session!);
                self.layer!.frame = self.view.frame;
                self.view.layer.addSublayer(self.layer!);
                
                 开始扫描
                self.session?.startRunning();
            }
            catch let error as NSError
            {
                print(error);
            }
        }

F、实现 AVCaptureMetadataOutputObjectsDelegate 委托中的方法：

委托
        @objc func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!)
        {
            let stringValue:String?;
            
            if (metadataObjects.count > 0)
            {
                let metadataObject = metadataObjects[0] as! AVMetadataMachineReadableCodeObject;
                
                
                stringValue = metadataObject.stringValue;
                if (nil != stringValue) 这里捕捉到二维码
                {
                    self.session!.stopRunning();
                     移除图层
                    self.layer!.removeFromSuperlayer();
                    
                    启动拨号～～
                    UIApplication.sharedApplication().openURL(NSURL(string: "tel://\(stringValue)")!);
                    
                    
    //                let alertView = UIAlertController(title: "二维码", message: stringValue, preferredStyle: .Alert);
    //                let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil);
    //                alertView.addAction(action);
                    
                    显示提示框
    //                self.presentViewController(alertView, animated: true, completion:nil);
                }
                else
                {
                    let alertView = UIAlertController(title: "二维码", message: "没有扫描到二维码", preferredStyle: .Alert);
                    let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil);
                    alertView.addAction(action);
                    
                    显示提示框
                    self.presentViewController(alertView, animated: true, completion:nil);
                }
            }
        }

G、详细源码：

import UIKit
    import AVFoundation
    
    class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate
    {
        定义属性
        var session: AVCaptureSession?;
        var layer: AVCaptureVideoPreviewLayer?;
        
        
        方法
        override func viewDidLoad()
        {
            super.viewDidLoad();
            ///self.view.backgroundColor = UIColor.lightGrayColor();
            self.modalPresentationStyle = .Custom;
            
        }
    
        
        扫描
        @IBAction func scanQRcode(sender: AnyObject)
        {
            self.session = AVCaptureSession();
            
             
            let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo);
            do
            {
                let input = try AVCaptureDeviceInput(device: device);
                
                if (self.session!.canAddInput(input))
                {
                    self.session!.addInput(input);
                }
                
                输出
                let output = AVCaptureMetadataOutput();
                output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue());
                
                if (self.session!.canAddOutput(output))
                {
                    self.session!.addOutput(output)
                    output.metadataObjectTypes = [AVMetadataObjectTypeQRCode];
                }
                
                添加图层
                self.layer = AVCaptureVideoPreviewLayer(session:self.session!);
                self.layer!.frame = self.view.frame;
                self.view.layer.addSublayer(self.layer!);
                
                 开始扫描
                self.session?.startRunning();
            }
            catch let error as NSError
            {
                print(error);
            }
        }
        
        委托
        @objc func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!)
        {
            let stringValue:String?;
            
            if (metadataObjects.count > 0)
            {
                let metadataObject = metadataObjects[0] as! AVMetadataMachineReadableCodeObject;
                
                
                stringValue = metadataObject.stringValue;
                if (nil != stringValue) 这里捕捉到二维码
                {
                    self.session!.stopRunning();
                     移除图层
                    self.layer!.removeFromSuperlayer();
                    
                    启动拨号～～
                    UIApplication.sharedApplication().openURL(NSURL(string: "tel://\(stringValue)")!);
                    
                    
    //                let alertView = UIAlertController(title: "二维码", message: stringValue, preferredStyle: .Alert);
    //                let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil);
    //                alertView.addAction(action);
                    
                    显示提示框
    //                self.presentViewController(alertView, animated: true, completion:nil);
                }
                else
                {
                    let alertView = UIAlertController(title: "二维码", message: "没有扫描到二维码", preferredStyle: .Alert);
                    let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil);
                    alertView.addAction(action);
                    
                    显示提示框
                    self.presentViewController(alertView, animated: true, completion:nil);
                }
            }
        }
        
        override func didReceiveMemoryWarning()
        {
            super.didReceiveMemoryWarning()
          
        }
    
    
    }

[http_blog.sina.com.cn_s_blog_7ea0400d0102uy01.html]: http://blog.sina.com.cn/s/blog_7ea0400d0102uy01.html
[Center]: /images/20220717/b450c963ead2414882d5149f0d23c4bc.png
[Center 1]: /images/20220717/b500a95b874441cdb7c2bde619294360.png
[Center 2]: /images/20220717/c8518a52f1a54c58a8e0ad198e453d50.png
[Center 3]: /images/20220717/dbf25dd3056d4afa90b057eef9a9c0a7.png
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[Center 5]: /images/20220717/75c0e64aa779490bbd1966d50ac289e4.png