Swift5以及IOS15对于二维码的使用

info.plist 加入这句话，而且第三个功能必须在真机上运行，模拟机不行。

Privacy - Camera Usage Description

OC方式:

一，二维码生成:

关键性代码:

- (void)viewDidLoad {[super viewDidLoad];//self.qrImageView.image = [GeneratorQRCodeVC creatQRImage:@"123" withSize:200];UIImage *image1 = [GeneratorQRCodeVC creatQRImage:@"123" withSize:200];UIImage *center = [UIImage imageNamed:@"zhengshuang.jpeg"];image1 = [self getNewImage:image1 withCenter:center];self.qrImageView.image = image1;
}
+(UIImage *)creatQRImage:(NSString *)url withSize:(CGFloat)size{CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];[filter setDefaults];NSString *string = url;NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];[filter setValue:data forKeyPath:@"inputMessage"];CIImage *img= [filter outputImage];return [self setQRImage:img withSize:size];
}
+(UIImage *)setQRImage:(CIImage *)image withSize:(CGFloat)size{CGRect extent = CGRectIntegral(image.extent);CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));size_t width = CGRectGetWidth(extent) * scale;size_t height = CGRectGetHeight(extent) * scale;CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);CIContext *context = [CIContext contextWithOptions:nil];CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);CGContextScaleCTM(bitmapRef, scale, scale);CGContextDrawImage(bitmapRef, extent, bitmapImage);CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);CGContextRelease(bitmapRef);CGImageRelease(bitmapImage);return [UIImage imageWithCGImage:scaledImage];
}
-(UIImage *)getNewImage:(UIImage *)sourceImage withCenter:(UIImage *)center{CGSize size = sourceImage.size;UIGraphicsBeginImageContext(sourceImage.size);[sourceImage drawInRect:CGRectMake(0, 0, size.width, size.height)];CGFloat width = 40,height = 40;CGFloat x = (size.width - width) / 2;CGFloat y = (size.height - height) / 2;[center drawInRect:CGRectMake(x, y, width, height)];UIImage *resultImgae = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return resultImgae;
}
@end

利用图形上下文，绘制了一个小图在图片内部，

二，二维码识别:

- (IBAction)shiBie:(id)sender {UIImage *image = self.sourceImageView.image;CIImage *imageCI = [[CIImage alloc] initWithImage:image];//开始识别//创建一个二维码探测器CIDetector *detector =  [CIDetector  detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];//直接探测二维码特征NSString *strMSg = nil;NSArray<CIFeature *> *features = [detector featuresInImage:imageCI];for (CIFeature *feature in features) {CIQRCodeFeature *qrFeatrue = (CIQRCodeFeature *)feature;NSLog(@"%@",qrFeatrue.messageString);strMSg = qrFeatrue.messageString;}UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"结果" message:strMSg preferredStyle:UIAlertControllerStyleAlert];[self presentViewController:alert animated:YES completion:nil];dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3*NSEC_PER_SEC)), dispatch_get_main_queue(), ^{[alert dismissViewControllerAnimated:YES completion:nil];});
}

我这里识别的是单一的图片。可以识别多张图片。

三，扫描二维码:

扫描是最难的，最麻烦的。

//
//  ScanQRCodeVC.m
//  01-掌握二维码综合案例OC
//
//  Created by lujun on 2021/11/4.
//
#import <AVFoundation/AVFoundation.h>
#import "ScanQRCodeVC.h"
#import "UIView+Frame.h"
@interface ScanQRCodeVC ()<AVCaptureVideoDataOutputSampleBufferDelegate>
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *bottomConstan;
@property (weak, nonatomic) IBOutlet UIImageView *qrBackView;
@property(nonatomic,weak)AVCaptureSession *session;
@end
@implementation ScanQRCodeVC
- (void)viewDidAppear:(BOOL)animated{[super viewDidAppear:animated];self.bottomConstan.constant = self.qrBackView.hm_height;[self.view layoutIfNeeded];self.bottomConstan.constant = -self.qrBackView.hm_height;[UIView animateWithDuration:2 animations:^{[UIView setAnimationsEnabled:YES];[UIView setAnimationRepeatCount:MAXFLOAT];[self.view layoutIfNeeded];}];
}
- (void)viewDidLoad {[super viewDidLoad];[self setupCaptureSession];
}
- (void)setupCaptureSession
{NSError *error = nil;AVCaptureSession *session = [[AVCaptureSession alloc] init];//负责输入和输出设置之间的数据传递session.sessionPreset = AVCaptureSessionPresetMedium;//设置分辨率AVCaptureDevice *device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:deviceerror:&error];if (!input) {}AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];//创建一个视频数据输出流if([session canAddInput:input] && [session canAddOutput:output] ){[session addInput:input];[session addOutput:output];}dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL);[output setSampleBufferDelegate:self queue:queue];// Specify the pixel formatoutput.videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA], kCVPixelBufferPixelFormatTypeKey,[NSNumber numberWithInt: 320], (id)kCVPixelBufferWidthKey,[NSNumber numberWithInt: 240], (id)kCVPixelBufferHeightKey,nil];AVCaptureVideoPreviewLayer* preLayer = [AVCaptureVideoPreviewLayer layerWithSession: session];//相机拍摄预览图层//preLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];preLayer.frame = CGRectMake(0, 0, 320, 240);preLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;[self.view.layer addSublayer:preLayer];output.minFrameDuration = CMTimeMake(1, 15);[session startRunning];
}- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBufferfromConnection:(AVCaptureConnection *)connection
{UIImage *image = [self imageFromSampleBuffer:sampleBuffer];
}
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);CVPixelBufferLockBaseAddress(imageBuffer, 0);void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);size_t width = CVPixelBufferGetWidth(imageBuffer);size_t height = CVPixelBufferGetHeight(imageBuffer);CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);CGImageRef quartzImage = CGBitmapContextCreateImage(context);CVPixelBufferUnlockBaseAddress(imageBuffer,0);CGContextRelease(context);CGColorSpaceRelease(colorSpace);UIImage *image = [UIImage imageWithCGImage:quartzImage];CGImageRelease(quartzImage);return (image);
}
@end

swift方式:

一。二维码的生成

override func viewDidLoad() {let str = inputTextView.text ?? ""super.viewDidLoad()self.title = "二维码生成";let filter = CIFilter(name: "CIQRCodeGenerator")filter?.setDefaults()let data = str.data(using: String.Encoding.utf8)filter?.setValue(data, forKey: "inputMessage")filter?.setValue("H", forKey: "inputCorrectionLevel")var image = filter?.outputImagelet transform = CGAffineTransform(scaleX: 20, y: 20)image = image?.transformed(by: transform)var resultImage = UIImage(ciImage: image!)let center  = UIImage(named: "zhengshuang.jpeg")!resultImage =  getNewImage(sourceImage: resultImage, center: center)qrCodeImageView.image = resultImage}func getNewImage(sourceImage: UIImage,center: UIImage) -> UIImage {let size = sourceImage.sizeUIGraphicsBeginImageContext(size)sourceImage.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))let width: CGFloat = 80let height: CGFloat = 80let x: CGFloat = (size.width - width) * 0.5let y: CGFloat = (size.height - height) * 0.5center.draw(in: CGRect(x: x, y: y, width: width, height: height))let resultImage = UIGraphicsGetImageFromCurrentImageContext()!UIGraphicsEndImageContext()return resultImage}

二，二维码的识别

        let image =  sourceImageView.imagelet imageCI = CIImage(image: image!)//开始识别//创建一个二维码探测器let dector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy: CIDetectorAccuracyHigh])//直接探测二维码特征let features = dector?.features(in: imageCI!)var resultImage = imagevar strMsg: String?var strMsgArr = [String]()for feature in features! {//            debugPrint(feature)let qrFeature = feature as! CIQRCodeFeaturedebugPrint(qrFeature.messageString)strMsgArr.append(qrFeature.messageString!)
//            debugPrint(qrFeature.bounds)resultImage = drawFrame(image: resultImage!, feature: qrFeature)sourceImageView.image = resultImagestrMsg = qrFeature.messageString}debugPrint(strMsg?.count)let al = UIAlertController(title: "结果", message: strMsgArr.description, preferredStyle: .alert)let action = UIAlertAction(title: "关闭", style: .cancel, handler: nil)self .present(al, animated: true, completion: nil)al.addAction(action)

   func drawFrame(image:UIImage,feature: CIQRCodeFeature) ->UIImage {let size = image.sizeUIGraphicsBeginImageContext(size)image.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))//转换坐标系 (上下颠倒)开始let context = UIGraphicsGetCurrentContext()!context.scaleBy(x: 1, y: -1)context.translateBy(x: 0, y: -size.height)
//        CGContextScaleCTM(context,1,-1) 函数过期
//        CGContextTranslateCTM(context,0,-size.height) 函数过期//转换坐标系 (上下颠倒) 结束let bounds = feature.boundslet path = UIBezierPath(rect: bounds)path.lineWidth = 6UIColor.red.setStroke()path.stroke()let resultImage = UIGraphicsGetImageFromCurrentImageContext()UIGraphicsEndImageContext()return resultImage!}

三，扫描二维码

import UIKit
import AVFoundation
class ScanQRCodeVC: UIViewController {var session: AVCaptureSession?weak var layer: AVCaptureVideoPreviewLayer?@IBOutlet weak var chongjiBoView: UIImageView!@IBOutlet weak var scanBackVIew: UIView!@IBOutlet weak var toBottom: NSLayoutConstraint!override func viewDidLoad() {super.viewDidLoad()title = "扫描二维码"}func startScan() -> Void{//1.获取 摄像头设备let device: AVCaptureDevice = AVCaptureDevice.default(for: .video)!var input: AVCaptureDeviceInput?do {input = try AVCaptureDeviceInput(device: device)}catch {debugPrint(error)return}//2.设置输出let output = AVCaptureMetadataOutput()//2.1 设置结果处理的代理output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)//3.创建会话session = AVCaptureSession()if session!.canAddInput(input!) && session!.canAddOutput(output) {session!.addInput(input!)session!.addOutput(output)}else{return}//3.1 设置二维码可以识别的码制output.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]let bounds = UIScreen.main.boundslet x: CGFloat = scanBackVIew.frame.origin.x / bounds.size.widthlet y: CGFloat = scanBackVIew.frame.origin.y / bounds.size.heightlet width: CGFloat = scanBackVIew.frame.size.width / bounds.size.widthlet height: CGFloat = scanBackVIew.frame.size.height / bounds.size.heightoutput.rectOfInterest = CGRect(x: y, y: x, width: height, height: width)let layer = AVCaptureVideoPreviewLayer(session: session!)layer.frame = UIScreen.main.boundsview.layer.insertSublayer(layer, at: 0)//4.启动会话让输入开始菜单数据 输出对象 开始处理数据session!.startRunning()self.layer = layer}override func viewDidAppear(_ animated: Bool) {super.viewDidAppear(animated)toBottom.constant = scanBackVIew.frame.size.heightview.layoutIfNeeded()toBottom.constant = -scanBackVIew.frame.size.heightUIView.animate(withDuration: 2) {UIView.setAnimationRepeatCount(MAXFLOAT)self.view.layoutIfNeeded()}}override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {startScan()}func removeScanAnim(){chongjiBoView.layer.removeAllAnimations()}}extension ScanQRCodeVC : AVCaptureMetadataOutputObjectsDelegate{func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection){//        debugPrint("set")debugPrint(metadataObjects)for obj in metadataObjects {if obj.isKind(of: AVMetadataMachineReadableCodeObject.self) {let resultObj = self.layer?.transformedMetadataObject(for: obj)let qrCodeObj = resultObj as! AVMetadataMachineReadableCodeObjectdebugPrint(qrCodeObj.stringValue!)debugPrint(qrCodeObj.corners)
//                qrCodeObj.corners 代表二维码4个角 但是//  drawFrame(qrCodeObj: qrCodeObj)}}}func drawFrame(qrCodeObj: AVMetadataMachineReadableCodeObject) -> Void {let corners = qrCodeObj.corners//1.借助一个图形层let shapLayer = CAShapeLayer()let path = UIBezierPath()var index = 0;for corner in corners {let pointDic = corner as! CFDictionaryvar point = CGPoint.zero
//            CGPointMakeWithDictionaryRepresentation(pointDic, &point)
//            point = CGPoint.init(dictionaryRepresentation: pointDic)!point = CGPoint.init(dictionaryRepresentation: pointDic)!if index==0 {path.move(to: point)}else {path.addLine(to: point)}index += 1}shapLayer.path = path.cgPathlayer?.addSublayer(shapLayer)}
}

git地址
https://gitee.com/johnson__save_admin/qrcode-swift

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Swift5以及IOS15对于二维码的使用

Swift5以及IOS15对于二维码的使用

OC方式:

一，二维码生成:

二，二维码识别:

三，扫描二维码:

swift方式:

一。二维码的生成

二，二维码的识别

三，扫描二维码

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