swift生成二维码,扫描二维码

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~~~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


~~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~~



------------我是分割线--------------

基于AVFoundation实现的。

1、效果

生成界面


扫描界面:



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,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,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
C、在ViewController.swift 文件调用

D、在main.storyboard中添加控件:


E、在viewcontroller.swift 做关联:


F、同理,在 viewcontroller.swift 关联按钮的事件


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

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!,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",handler: nil);
                alertView.addAction(action);
                
                ////显示提示框
                self.presentViewController(alertView,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!,completion:nil);
            }
        }
    }
    
    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
      
    }


}

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