iOS-长按识别二维码/生成二维码/扫描二维码

你的名字 2023-10-05 09:17 47阅读 0赞

参考：http://www.jianshu.com/p/997cec333822

参考：https://github.com/nglszs/BCQRcode

方式一：长按识别二维码

#import "LYBLongPressRecognizeEwmVC.h"
    #import "UIImageView+CreatCode.h"
    /** 补充的iOS9新特性*/
    #import <SafariServices/SafariServices.h>
    
    @interface LYBLongPressRecognizeEwmVC ()
    
    @end
    
    @implementation LYBLongPressRecognizeEwmVC
    
    - (void)viewDidLoad {
        [super viewDidLoad];
    
        [self createErweima];
    
        //长按识别图中的二维码，类似于微信里面的功能,前提是当前页面必须有二维码
        UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(readCode:)];
        [self.view addGestureRecognizer:longPress];
    }
    
    - (void)readCode:(UILongPressGestureRecognizer *)pressSender {
        if (pressSender.state ==UIGestureRecognizerStateBegan) {
            //截图再读取
            UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,YES, 0);
            CGContextRef context =UIGraphicsGetCurrentContext();
            [self.view.layer renderInContext:context];
            UIImage *image =UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
    
            //识别二维码
            CIImage *ciImage = [[CIImage alloc]initWithCGImage:image.CGImage options:nil];
            CIContext *ciContext = [CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer : @(YES)}];//软件渲染
            CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:ciContext options:@{CIDetectorAccuracy :CIDetectorAccuracyHigh}];//二维码识别
            NSArray *features = [detector featuresInImage:ciImage];
            for (CIQRCodeFeature *feature in features) {
                NSLog(@"msg = %@",feature.messageString);//打印二维码中的信息
                if ([feature.messageString containsString:@"http"]) {
                    //4.1 创建SafariVC
                    SFSafariViewController *sfVC = [[SFSafariViewController         alloc] initWithURL:[NSURL URLWithString:feature.messageString]];
                    //4.2 弹出SafariVC
                    [self presentViewController:sfVC animated:YES completion:nil];
                }
            }
        }
    }
    
    //创建二维码
    - (void)createErweima {
        UIImageView *imgV=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, WIDTH)];
        [self.view addSubview:imgV];
        [imgV creatCode:@"http://www.baidu.com" Image:nil andImageCorner:20];
    }
    
    @end

\*\*\*\*\*\*\*\*\*\*\*\*生成二维码

#import <UIKit/UIKit.h>
     
    NS_ASSUME_NONNULL_BEGIN
     
    @interface UIImageView (CreatCode)
    
    /**
      这里传入二维码的信息,image是加载二维码上方的图片,如果不要图片直接codeImage为nil即可,后面是图片的圆角
      */
    -(void)creatCode:(NSString *)codeContent Image:(UIImage *)codeImage andImageCorner:(CGFloat)imageCorner;
     
    @end
     
    NS_ASSUME_NONNULL_END
    *******
     
    #import "UIImageView+CreatCode.h"
    #define ImageSize self.bounds.size.width
    
    @implementation UIImageView (CreatCode)
    
    - (void)creatCode:(NSString *)codeContent Image:(UIImage *)codeImage andImageCorner:(CGFloat)imageCorner {
       //用CoreImage框架实现二维码的生成，下面方法最好异步调用
       dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
           CIFilter *codeFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
           //每次调用都恢复其默认属性
           [codeFilter setDefaults];
           NSData *codeData = [codeContent dataUsingEncoding:NSUTF8StringEncoding];
           //设置滤镜数据
           [codeFilter setValue:codeData forKey:@"inputMessage"];
           //获得滤镜输出的图片
           CIImage *outputImage = [codeFilter outputImage];
           //这里的图像必须经过位图转换，不然会很模糊
           UIImage *translateImage = [self creatUIImageFromCIImage:outputImage andSize:ImageSize];
           //这里如果不想设置圆角，直接传一个image就好了
           UIImage *resultImage = [self setSuperImage:translateImage andSubImage:[self
           imageCornerRadius:imageCorner andImage:codeImage]];
           dispatch_async(dispatch_get_main_queue(), ^{
                self.image = resultImage;
             });
       });
    }
     
    //这里的size我是用imageview的宽度来算的，你可以改为自己想要的size
    - (UIImage *)creatUIImageFromCIImage:(CIImage *)image andSize:(CGFloat)size {
        //下面是创建bitmao没什么好解释的,不懂得自行百度或者参考官方文档
        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 colorRef = CGColorSpaceCreateDeviceGray();
        CGContextRef contextRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorRef, (CGBitmapInfo)kCGImageAlphaNone);
        CIContext *context = [CIContext contextWithOptions:nil];
        CGImageRef imageRef = [context createCGImage:image fromRect:extent];
        CGContextSetInterpolationQuality(contextRef,kCGInterpolationNone);
        CGContextScaleCTM(contextRef, scale, scale);
        CGContextDrawImage(contextRef, extent, imageRef);
        CGImageRef newImage = CGBitmapContextCreateImage(contextRef);
        CGContextRelease(contextRef);
        CGImageRelease(imageRef);
        return [UIImage imageWithCGImage:newImage];
    }
     
    //这里将二维码上方的图片设置圆角并缩放
    - (UIImage *)imageCornerRadius:(CGFloat)cornerRadius andImage:(UIImage *)image {
        //这里是将图片进行处理，frame不能太大，否则会挡住二维码
        CGRect frame = CGRectMake(0, 0,ImageSize/5, ImageSize/5);
        UIGraphicsBeginImageContextWithOptions(frame.size,NO, 0);
        [[UIBezierPath bezierPathWithRoundedRect:frame cornerRadius:cornerRadius] addClip];
        [image drawInRect:frame];
        UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return clipImage;
    }
    
    - (UIImage *)setSuperImage:(UIImage *)superImage andSubImage:(UIImage *)subImage {
        //将两张图片绘制在一起
        UIGraphicsBeginImageContextWithOptions(superImage.size,YES, 0);
        [superImage drawInRect:CGRectMake(0, 0, superImage.size.width, superImage.size.height)];
        [subImage drawInRect:CGRectMake((ImageSize - ImageSize/5)/2, (ImageSize -ImageSize/5)/2, subImage.size.width, subImage.size.height)];
        UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return resultImage;
    }
     
    @end

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*扫描二维码

#import <UIKit/UIKit.h>
    
    #import <AVFoundation/AVFoundation.h>
    
    @interface ScanCodeViewController :UIViewController<AVCaptureMetadataOutputObjectsDelegate>{
        AVCaptureSession * session;
        AVCaptureMetadataOutput * output;
        NSInteger lineNum;
        BOOL upOrDown;
        NSTimer *lineTimer;
    }
    
    @property (nonatomic,strong)UIImageView *lineImageView;
    @property (nonatomic,strong)UIImageView *backImageView;
    
    @end
    
    
    #import "ScanCodeViewController.h"
    
    @implementation ScanCodeViewController
    
    - (void)viewDidLoad {
        [superviewDidLoad];
        if ([[[UIDevicecurrentDevice]systemVersion]floatValue] >= 7.0) {
           AVAuthorizationStatus authStatus =  [AVCaptureDeviceauthorizationStatusForMediaType:AVMediaTypeVideo];
           if (authStatus ==AVAuthorizationStatusDenied || authStatus ==AVAuthorizationStatusRestricted) {
                [[[UIAlertViewalloc]initWithTitle:nilmessage:@"本应用无访问相机的权限，如需访问，可在设置中修改"delegate:nilcancelButtonTitle:@"好的"otherButtonTitles:nil,nil]show];
                return;
           } else {
                //打开相机
                AVCaptureDevice * device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];
                //创建输入流
                AVCaptureDeviceInput * input = [AVCaptureDeviceInputdeviceInputWithDevice:deviceerror:nil];
    
                //创建输出流
                output = [[AVCaptureMetadataOutputalloc]init];
                //设置代理在主线程里刷新[outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];
                //设置扫描区域，这个需要仔细调整
                [outputsetRectOfInterest:CGRectMake(64/BCHeight, (BCWidth - 320)/2/BCWidth, 320/BCHeight, 320/BCWidth)];
    
                //初始化链接对象
                session = [[AVCaptureSessionalloc]init];
                //高质量采集率
                [sessionsetSessionPreset:AVCaptureSessionPresetHigh];
                [sessionaddInput:input];
                [sessionaddOutput:output];
                //设置扫码支持的编码格式output.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode128Code];
                AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayerlayerWithSession:session];
                layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
                layer.frame=self.view.layer.bounds;
                [self.view.layeraddSublayer:layer];
            }
        }
        [self_initView];
    }
    
    //里面所有的控件可以自己定制，这里只是简单的例子
    - (void)_initView {
        //扫码框
        _backImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0, 64,BCWidth,BCHeight - 64)];
        _backImageView.image = [UIImageimageNamed:@"camera_bg"];
        [self.viewaddSubview:_backImageView];
        _lineImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(16, 15,BCWidth - 32, 1)];
        _lineImageView.backgroundColor = [UIColororangeColor];
        [_backImageViewaddSubview:_lineImageView];
        //各种参数设置
        lineNum = 0;
        upOrDown =NO;
        lineTimer = [NSTimerscheduledTimerWithTimeInterval:0.01target:selfselector:@selector(lineAnimation)userInfo:nilrepeats:YES];
    }
    
    - (void)lineAnimation {
        if (upOrDown ==NO) {
            lineNum ++;
            _lineImageView.frame =CGRectMake(CGRectGetMinX(_lineImageView.frame), 15 + lineNum, BCWidth - 32, 1);
            CGFloat tempHeight =CGRectGetHeight(_backImageView.frame) * 321/542;
            NSInteger height = (NSInteger)tempHeight + 20;
            if (lineNum == height) {
                upOrDown =YES;
            }
        }
        else {
            lineNum --;
            _lineImageView.frame =CGRectMake(CGRectGetMinX(_lineImageView.frame), 15 + lineNum, BCWidth - 32, 1);
            if (lineNum == 0) {
                upOrDown =NO;
            }
        }
    }
    
    #pragma mark AVCaptureMetadataOutputObjectsDelegate
    - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
        if ([metadataObjectscount] > 0) {
            [sessionstopRunning];//停止扫码
            AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjectsfirstObject];
            ResultViewController *resultVC = [[ResultViewControlleralloc]init];
            resultVC.contentString = metadataObject.stringValue;
            [self.navigationControllerpushViewController:resultVCanimated:NO];
        }
    }
    
    - (void)viewWillAppear:(BOOL)animated {
        [superviewWillAppear:animated];
        [sessionstartRunning];
        [lineTimersetFireDate:[NSDatedistantPast]];
    }
    
    - (void)viewWillDisappear:(BOOL)animated {
        [superviewWillDisappear:animated];
        [sessionstopRunning];
        [lineTimersetFireDate:[NSDatedistantFuture]];
        if (![self.navigationController.viewControllers containsObject:self]) {//释放timer
            [lineTimerinvalidate];
            lineTimer =nil;
        }
    }
    
    - (void)dealloc {
        NSLog(@"已释放");
    }
    
    @end