Swift3.0生成二维码、扫描二维码、相册读取二维码,兼容iOS7(结合ZXingObjC)

《Swift3.0生成二维码、扫描二维码、相册读取二维码,兼容iOS7(结合ZXingObjC)》《Swift3.0生成二维码、扫描二维码、相册读取二维码,兼容iOS7(结合ZXingObjC)》

 

 

 

二维码生成

 

//MARK: 传进去字符串,生成二维码图片(>=iOS7)  text:要生成的二维码内容   WH:二维码高宽
    private func creatQRCodeImage(text: String,WH:CGFloat) -> UIImage{
        
        //创建滤镜
        let filter = CIFilter(name: "CIQRCodeGenerator")
        //还原滤镜的默认属性
        filter?.setDefaults()
        //设置需要生成二维码的数据
        filter?.setValue(text.data(using: String.Encoding.utf8), forKey: "inputMessage")
        //从滤镜中取出生成的图片
        let ciImage = filter?.outputImage
        //这个清晰度好
        let bgImage = createNonInterpolatedUIImageFormCIImage(image: ciImage!, size: WH)
        
        return bgImage
    }

 

 

 

上面生成的image,需要用到一个方法,原因是直接生产的图片二维码清晰度不够,需要处理一下

//MARK: - 根据CIImage生成指定大小的高清UIImage
    private func createNonInterpolatedUIImageFormCIImage(image: CIImage, size: CGFloat) -> UIImage {
        
        let extent: CGRect = image.extent.integral
        let scale: CGFloat = min(size/extent.width, size/extent.height)
        
        let width = extent.width * scale
        let height = extent.height * scale
        let cs: CGColorSpace = CGColorSpaceCreateDeviceGray()
        let bitmapRef = CGContext(data: nil, width: Int(width), height: Int(height), bitsPerComponent: 8, bytesPerRow: 0, space: cs, bitmapInfo: 0)!
        
        let context = CIContext(options: nil)
        let bitmapImage: CGImage = context.createCGImage(image, from: extent)!
        
        bitmapRef.interpolationQuality = CGInterpolationQuality.none
        bitmapRef.scaleBy(x: scale, y: scale)
        bitmapRef.draw(bitmapImage, in: extent)
        let scaledImage: CGImage = bitmapRef.makeImage()!
        return UIImage(cgImage: scaledImage)
    }

 

 

这样,我们就能得到想要的二维码图片了

有时,我们需要在二维码中间添加log水印等,我试过两种方法,第一种是直接用图形上下文UIGraphicsBeginImageContext这种实现,不够实现起来有点模糊,后来就直接用最原始方式了:直接add图片上去(也可能是我第一种实现有问题,这里大家可以自己试一下先)

添加log:(一些参数可以自己调,这里做个示例)

 

//MARK: - 根据背景图片和头像合成头像二维码
    private func creatIconImage(iconImage:UIImage,sizeWH:CGFloat,superImgView:UIImageView){
        
        let iconImgView = UIImageView(image: iconImage)
        iconImgView.contentMode = .scaleAspectFit
        iconImgView.frame = CGRect(x: (superImgView.bounds.size.width-sizeWH)/2, y: (superImgView.bounds.size.height-sizeWH)/2, width: sizeWH, height: sizeWH)
        iconImgView.layer.cornerRadius = 5
        iconImgView.layer.borderColor = UIColor.white.cgColor
        iconImgView.layer.borderWidth = 4
        iconImgView.layer.masksToBounds = true
        superImgView.addSubview(iconImgView)
        
    }

 

 

二维码扫描

使用AVCaptureDevice,基于系统的AVFoundation框架,所以使用前,先import

import UIKit
import AVFoundation

1、定义扫描的一些属性

    //扫描定义属性
    var device:AVCaptureDevice! = nil
    var input:AVCaptureDeviceInput! = nil
    var output:AVCaptureMetadataOutput! = nil
    var session:AVCaptureSession! = nil
    var preview:AVCaptureVideoPreviewLayer! = nil

2、设置扫描

/// 设置扫描参数
    func setupCamera() {
        DispatchQueue.global().async {
            if (self.device == nil){
                self.device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
                do{
                    self.input = try AVCaptureDeviceInput.init(device: self.device)
                }catch{
                    print("self.input init error")
                }
                
                self.output = AVCaptureMetadataOutput.init()
                self.output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
                
                self.session = AVCaptureSession.init()
                self.session.canSetSessionPreset(AVCaptureSessionPresetHigh)
                if self.session.canAddInput(self.input){
                    self.session .addInput(self.input)
                    self.canOpen = true
                }else{
                    DispatchQueue.main.async {
                        let alert = UIAlertView(title: "提示", message: "打开相机权限", delegate: self, cancelButtonTitle: "取消", otherButtonTitles: "设置")
                        alert.show()
                    }
                }
                
                if self.canOpen{
                    if self.session.canAddOutput(self.output){
                        self.session.addOutput(self.output)
                    }
                    // 只支持二维码
                    self.output.metadataObjectTypes = [AVMetadataObjectTypeQRCode]
                    
                    self.preview = AVCaptureVideoPreviewLayer(session: self.session)
                    self.preview.videoGravity = AVLayerVideoGravityResizeAspectFill
                    DispatchQueue.main.async {
                        self.preview.frame = CGRect(x: 0, y: 0, width: KScreenWidth, height: KScreenHeight)
                        self.view.layer.insertSublayer(self.preview, at: 0)
                    }
                    
                }
                
            }
            if self.canOpen{
                DispatchQueue.main.async {
                    //开启定时器,构造移动动画效果
                    self.timer = Timer(timeInterval: 0.02, target: self, selector: #selector(self.lineAnimation), userInfo: nil, repeats: true)
                    RunLoop.current.add(self.timer!, forMode: .defaultRunLoopMode)
                    //开始采集数据
                    self.session.startRunning()
                }
            }
        }
      
    }

扫描后,会触发一个代理,这里我们可以获取到扫描内容

// MARK: - 扫描二维码后的代理
extension QRCodeScanViewController:AVCaptureMetadataOutputObjectsDelegate{
    func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
        var strValue:String = ""
        if metadataObjects.count>0{
            let obj:AVMetadataMachineReadableCodeObject = metadataObjects.first as! AVMetadataMachineReadableCodeObject
            strValue = obj.stringValue
        }
        
        self.session.stopRunning()
        self.timer?.invalidate()
        self.timer = nil
        
        self.playBeep()
        
        self.showQRCode(qrcodeString: strValue)
    }
    
}

以上都是一些核心代码,当然,我们还需要对它进行一些UI自定义,比如扫描背景色,扫描提示说明,红线的动画移动等

这里我就不一一贴出来了,文章最后会有获取源码的链接地址。

 

其实到这里,我们都可以依靠系统提供的API实现二维码的生成和扫描功能,最低要求的系统为iOS7。

下面,如果是从相册获取呢?

二维码相册读取

ios从相册读取二维码,在ios8以上,苹果依然提供了自带的识别图片二维码的功能,这种方式效率最好,也是最推荐的,但在兼容ios7时,我们就必须用其他方式实现。

选择第三方框架:

ZXingObjC  OR  ZBar   ??

 

这里我选择的是 ZXingObjC,相比于ZBar,这个库一直有人在维护,而且易用性相比后者 也好一点(个人觉得哈,当然也有很多人选择的ZBar,其实都差不多)。

 

1、pod导入ZXingObjc

pod 'ZXingObjC', '~> 3.0'

 

代码实现记录如下:

注意:这里我之前测试的代码是用oc写的,还没来得及转成swift3,大家先看思路哈,勿怪~~

2、从相册选择好图片  

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    UIImage *image = 
; [self dismissViewControllerAnimated:YES completion:^{ [self getInfoWithImage:image]; }]; }

 

3、解析图片二维码-(void)getInfoWithImage:(UIImage *)image{

//8系统以上用系统提供的方法
    if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")){
        CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];
        NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];
        
        if (features.count >= 1){
            
            for (int index = 0; index < [features count]; index ++) {
                CIQRCodeFeature *feature = [features objectAtIndex:index];
                NSString *scannedResult = feature.messageString;
                NSLog(@"result:%@",scannedResult);
                //进行自己业务处理
            }
        }else{
            NSLog(@"no image");
        }
       
    }else{
        NSLog(@"ios8  以下系统");
        CGImageRef imageToDecode=[image CGImage];
        
        ZXLuminanceSource * source = [[ZXCGImageLuminanceSource alloc] initWithCGImage:imageToDecode];
        ZXBinaryBitmap * bitmap = [ZXBinaryBitmap binaryBitmapWithBinarizer:[ZXHybridBinarizer binarizerWithSource:source]];
        NSError *error = nil;
        ZXDecodeHints *hints = [ZXDecodeHints hints];
        ZXMultiFormatReader * reader = [ZXMultiFormatReader reader];
        ZXResult *result = [reader decode:bitmap hints:hints error:&error];
        
        if (result) {
            NSString *contents = result.text;
            NSLog(@"解析成功:%@",contents);
       //进行自己业务处理
     }else{ 
        NSLog(@" --- 解析失败"); 
     }
}

}

系统 CIDetector识别二维码,我后面加了swift4版本写法,供参考

///  识别图片二维码,要求ios8系统及以上
    ///
    /// - Parameter img: <#img description#>
    func getQRCodeWithImage(img:UIImage) {
        let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh])
        let features = detector?.features(in: CIImage(cgImage: img.cgImage!))
        if features == nil || features!.count <= 0{
            return
        }
        
        for feature in features! {
            if let qrcode = feature as? CIQRCodeFeature{
                self.playBeep()
                print(qrcode.messageString)
            }
        }
        
    }

 

 

最后,获取源码地址

点击这里获取源码

 

Enjoy~

转载于:https://www.cnblogs.com/yajunLi/p/5942361.html

    原文作者:9栋108
    原文地址: https://blog.csdn.net/weixin_30814319/article/details/95906648
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
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