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[操作系统]二维码扫描利用ZBar实现


上次是根据系统的属性自己封装的一个二维码扫描,这次给大家介绍一下基于ZBar集成的类似于QQ二维码扫描界面的二维码扫描的效果。

                                                               最下方配有效果图哦!

首先,需要引入ZBar第三方库文件:

ZBarSDK

libqrencode

其次,利用ZBar集成二维码扫描需要引入的类库有:

libiconv.tbd

QuartzCore.framework

CoreVideo.framework

CoreMedia.framework

AVFoundation.framework

代码实现:

-(void)createView{

    //扫描页的背景图片

    UIImageView*bgImageView;

    if (self.view.frame.size.height<500) {

        UIImage*image= [UIImage imageNamed:@"qrcode_scan_bg_Green.png"];

        bgImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height-64-100)];

        bgImageView.contentMode=UIViewContentModeTop;

        bgImageView.clipsToBounds=YES;

        

        bgImageView.image=image;

        bgImageView.userInteractionEnabled=YES;

    }else if(self.view.frame.size.height<600){

        UIImage*image= [UIImage imageNamed:@"qrcode_scan_bg_Green_iphone5"];

        bgImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height-64-100)];

        bgImageView.contentMode=UIViewContentModeTop;

        bgImageView.clipsToBounds=YES;

        

        bgImageView.image=image;

        bgImageView.userInteractionEnabled=YES;

    }

    else if(self.view.frame.size.height<680){

        UIImage*image= [UIImage imageNamed:@"qrcode_scan_bg_Green_iphone6"];

        bgImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height-64-100)];

        bgImageView.contentMode=UIViewContentModeTop;

        bgImageView.clipsToBounds=YES;

        

        bgImageView.image=image;

        bgImageView.userInteractionEnabled=YES;

    }

    else{

        UIImage*image= [UIImage imageNamed:@"qrcode_scan_bg_Green_iphone6p"];

        bgImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height-64-100)];

        bgImageView.contentMode=UIViewContentModeTop;

        bgImageView.clipsToBounds=YES;

        

        bgImageView.image=image;

        bgImageView.userInteractionEnabled=YES;

    }

    [self.view addSubview:bgImageView];

    

    //扫描框下面的提示语

    if (self.view.frame.size.height<600) {

        UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height-200, self.view.frame.size.width, 40)];

        label.text = @"将取景框对准二维码,即可自动扫描。";

        label.font=[UIFont systemFontOfSize:12];

        label.textColor = [UIColor whiteColor];

        label.textAlignment = NSTextAlignmentCenter;

        label.lineBreakMode = NSLineBreakByWordWrapping;

        label.numberOfLines = 2;

        label.backgroundColor = [UIColor clearColor];

        [bgImageView addSubview:label];

 

    }else{

        UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height-300, self.view.frame.size.width, 40)];

        label.text = @"将取景框对准二维码,即可自动扫描。";

        label.font=[UIFont systemFontOfSize:17];

        label.textColor = [UIColor whiteColor];

        label.textAlignment = NSTextAlignmentCenter;

        label.lineBreakMode = NSLineBreakByWordWrapping;

        label.numberOfLines = 2;

        label.backgroundColor = [UIColor clearColor];

        [bgImageView addSubview:label];

 

    }

    //初始化扫描线

    //4s/5/5s

    if (self.view.frame.size.height<600) {

        _line = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width/5.8, 50, 220, 2)];

    }

    else{

        //6/6s/6p

        _line = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width/4.6, 50, 220, 2)];

    }

    

    _line.image = [UIImage imageNamed:@"qrcode_scan_light_green.png"];

    [bgImageView addSubview:_line];

    //下方相册

    UIImageView*scanImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, bgImageView.frame.size.height+64, self.view.frame.size.width, 100)];

    scanImageView.image=[UIImage imageNamed:@"qrcode_scan_bar.png"];

    scanImageView.userInteractionEnabled=YES;

    [self.view addSubview:scanImageView];

    NSArray*unSelectImageNames=@[@"qrcode_scan_btn_photo_nor.png",@"qrcode_scan_btn_flash_nor.png",@"qrcode_scan_btn_myqrcode_nor.png"];

    NSArray*selectImageNames=@[@"qrcode_scan_btn_photo_down.png",@"qrcode_scan_btn_flash_down.png",@"qrcode_scan_btn_myqrcode_down.png"];

    

    for (int i=0; i<unSelectImageNames.count; i++) {

        UIButton*button=[UIButton buttonWithType:UIButtonTypeCustom];

        [button setImage:[UIImage imageNamed:unSelectImageNames[i]] forState:UIControlStateNormal];

        [button setImage:[UIImage imageNamed:selectImageNames[i]] forState:UIControlStateHighlighted];

        button.frame=CGRectMake(self.view.frame.size.width/3*i, 0, self.view.frame.size.width/3, 100);

        [scanImageView addSubview:button];

        if (i==0) {

            [button addTarget:self action:@selector(pressPhotoLibraryButton:) forControlEvents:UIControlEventTouchUpInside];

        }

        if (i==1) {

            [button addTarget:self action:@selector(flashLightClick) forControlEvents:UIControlEventTouchUpInside];

        }

        if (i==2) {

            button.hidden=YES;

        }  

    }

    //假导航

    UIImageView*navImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 64)];

    navImageView.image=[UIImage imageNamed:@"qrcode_scan_bar.png"];

    navImageView.userInteractionEnabled=YES;

    [self.view addSubview:navImageView];

    UILabel*titleLabel=[[UILabel alloc]initWithFrame:CGRectMake(self.view.frame.size.width/2-32,20 , 64, 44)];

    titleLabel.textColor=[UIColor whiteColor];

    titleLabel.text=@"扫一扫";

    [navImageView addSubview:titleLabel];

    //返回按钮

    UIButton*button = [UIButton buttonWithType:UIButtonTypeCustom];

    [button setImage:[UIImage imageNamed:@"qrcode_scan_titlebar_back_pressed@2x.png"] forState:UIControlStateHighlighted];

    [button setImage:[UIImage imageNamed:@"qrcode_scan_titlebar_back_nor.png"] forState:UIControlStateNormal];

    

    [button setFrame:CGRectMake(10,15, 48, 48)];

    [button addTarget:self action:@selector(pressCancelButton:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

    

    timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(animation1) userInfo:nil repeats:YES];

}

 

//扫描线的动画效果

-(void)animation1

{

        [UIView animateWithDuration:2 animations:^{

        if (self.view.frame.size.height<600) {

            _line.frame = CGRectMake(self.view.frame.size.width/5.8, self.view.frame.size.height/43*22, 220, 2);

        }else{

            _line.frame = CGRectMake(self.view.frame.size.width/4.6, self.view.frame.size.height/43*22, 220, 2);

        }

    }completion:^(BOOL finished) {

        [UIView animateWithDuration:2 animations:^{

            if (self.view.frame.size.height<600) {

                _line.frame = CGRectMake(self.view.frame.size.width/5.8, 50, 220, 2);

            }

            else{

                _line.frame = CGRectMake(self.view.frame.size.width/5.8, 50, 220, 2);

            }

        }];

    }];

}

//开启关闭闪光灯

-(void)flashLightClick{

    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    

    if (device.torchMode==AVCaptureTorchModeOff) {

        //闪光灯开启

        [device lockForConfiguration:nil];

        [device setTorchMode:AVCaptureTorchModeOn];

    }else {

        //闪光灯关闭

        [device setTorchMode:AVCaptureTorchModeOff];

    }

}

 

- (void)viewDidLoad

{

    

    //相机界面的定制在self.view上加载即可

    BOOL Custom= [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];//判断摄像头是否能用

    if (Custom) {

        [self initCapture];//启动摄像头

    }

    [self createView];

    [super viewDidLoad];

    

}

#pragma mark 选择相册

- (void)pressPhotoLibraryButton:(UIButton *)button

{  if (timer) {

    [timer invalidate];

    timer=nil;

}

    _line.frame = CGRectMake(50, 50, 220, 2);

    num = 0;

    upOrdown = NO;

 

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    picker.allowsEditing = YES;

    picker.delegate = self;

    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentViewController:picker animated:YES completion:^{

        self.isScanning = NO;

        [self.captureSession stopRunning];

    }];

}

#pragma mark 点击取消

- (void)pressCancelButton:(UIButton *)button

{

    self.isScanning = NO;

    [self.captureSession stopRunning];

    

    self.ScanResult(nil,NO);

    if (timer) {

        [timer invalidate];

        timer=nil;

    }

    _line.frame = CGRectMake(50, 50, 220, 2);

    num = 0;

    upOrdown = NO;

    [self dismissViewControllerAnimated:YES completion:nil];

}

#pragma mark 开启相机

- (void)initCapture

{

    self.captureSession = [[AVCaptureSession alloc] init];

    

    AVCaptureDevice* inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    

    AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:nil];

    [self.captureSession addInput:captureInput];

    AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init];

    captureOutput.alwaysDiscardsLateVideoFrames = YES;

    

    if (IOS7) {

        AVCaptureMetadataOutput*_output=[[AVCaptureMetadataOutput alloc]init];

        [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

        [self.captureSession setSessionPreset:AVCaptureSessionPresetHigh];

        [self.captureSession addOutput:_output];

        _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];

        

        if (!self.captureVideoPreviewLayer) {

            self.captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];

        }

        // NSLog(@"prev %p %@", self.prevLayer, self.prevLayer);

        self.captureVideoPreviewLayer.frame = self.view.bounds;

        self.captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

        [self.view.layer addSublayer: self.captureVideoPreviewLayer];

        self.isScanning = YES;

        [self.captureSession startRunning];

    }else{

        [captureOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];

        

        NSString* key = (NSString *)kCVPixelBufferPixelFormatTypeKey;

        NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];

        NSDictionary *videoSettings = [NSDictionary dictionaryWithObject:value forKey:key];

        [captureOutput setVideoSettings:videoSettings];

        [self.captureSession addOutput:captureOutput];

        

        NSString* preset = 0;

        if (NSClassFromString(@"NSOrderedSet") && // Proxy for "is this iOS 5" ...

            [UIScreen mainScreen].scale > 1 &&

            [inputDevice

             supportsAVCaptureSessionPreset:AVCaptureSessionPresetiFrame960x540]) {

                // NSLog(@"960");

                preset = AVCaptureSessionPresetiFrame960x540;

            }

        if (!preset) {

            // NSLog(@"MED");

            preset = AVCaptureSessionPresetMedium;

        }

        self.captureSession.sessionPreset = preset;

        

        if (!self.captureVideoPreviewLayer) {

            self.captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];

        }

        // NSLog(@"prev %p %@", self.prevLayer, self.prevLayer);

        self.captureVideoPreviewLayer.frame = self.view.bounds;

        self.captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

        [self.view.layer addSublayer: self.captureVideoPreviewLayer];

        

        self.isScanning = YES;

        [self.captureSession startRunning];

     }

}

- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer

{

    CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

    // Lock the base address of the pixel buffer

    CVPixelBufferLockBaseAddress(imageBuffer,0);

    

    // Get the number of bytes per row for the pixel buffer

    size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);

    // Get the pixel buffer width and height

    size_t width = CVPixelBufferGetWidth(imageBuffer);

    size_t height = CVPixelBufferGetHeight(imageBuffer);

    

    // Create a device-dependent RGB color space

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    if (!colorSpace)

    {

        NSLog(@"CGColorSpaceCreateDeviceRGB failure");

        return nil;

    }

    // Get the base address of the pixel buffer

    void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);

    // Get the data size for contiguous planes of the pixel buffer.

    size_t bufferSize = CVPixelBufferGetDataSize(imageBuffer);

    

    // Create a Quartz direct-access data provider that uses data we supply

    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, baseAddress, bufferSize,NULL);

    // Create a bitmap image from data supplied by our data provider

    CGImageRef cgImage =

    CGImageCreate(width,height,8,32,bytesPerRow,colorSpace,kCGImageAlphaNoneSkipFirst |kCGBitmapByteOrder32Little,provider,NULL,true,kCGRenderingIntentDefault);

    CGDataProviderRelease(provider);

    CGColorSpaceRelease(colorSpace);

    // Create and return an image object representing the specified Quartz image

    UIImage *image = [UIImage imageWithCGImage:cgImage];

  return image;

}

 #pragma mark 对图像进行解码

- (void)decodeImage:(UIImage *)image

{

    self.isScanning = NO;

    ZBarSymbol *symbol = nil;

    ZBarReaderController* read = [ZBarReaderController new];

    read.readerDelegate = self;

    CGImageRef cgImageRef = image.CGImage;

    for(symbol in [read scanImage:cgImageRef])break;

    if (symbol!=nil) {

        if (timer) {

            [timer invalidate];

            timer=nil;

        }

        _line.frame = CGRectMake(50, 50, 220, 2);

        num = 0;

        upOrdown = NO;

        self.ScanResult(symbol.data,YES);

        [self.captureSession stopRunning];

        [self dismissViewControllerAnimated:YES completion:nil];

    }else{

        timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(animation1) userInfo:nil repeats:YES];

        num = 0;

        upOrdown = NO;

        self.isScanning = YES;

        [self.captureSession startRunning];

        }

 }

#pragma mark - AVCaptureVideoDataOutputSampleBufferDelegate

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection

{

    UIImage *image = [self imageFromSampleBuffer:sampleBuffer];

    

    [self decodeImage:image];

}

#pragma mark AVCaptureMetadataOutputObjectsDelegate//IOS7下触发

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection

{

  if (metadataObjects.count>0)

    {

        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];

        self.ScanResult(metadataObject.stringValue,YES);

    }

    [self.captureSession stopRunning];

    _line.frame = CGRectMake(50, 50, 220, 2);

    num = 0;

    upOrdown = NO;

    [self dismissViewControllerAnimated:YES completion:nil];

}

#pragma mark - UIImagePickerControllerDelegate

 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

    if (timer) {

        [timer invalidate];

        timer=nil;

    }

    _line.frame = CGRectMake(50, 50, 220, 2);

    num = 0;

    upOrdown = NO;

    UIImage *image = [info objectForKey:@"UIImagePickerControllerEditedImage"];

    [self dismissViewControllerAnimated:YES completion:^{[self decodeImage:image];}];

}

//相册取消

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

    if (timer) {

        [timer invalidate];

        timer=nil;

    }

    _line.frame = CGRectMake(50, 50, 220, 2);

    num = 0;

    upOrdown = NO;

    timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(animation1) userInfo:nil repeats:YES];

    [self dismissViewControllerAnimated:YES completion:^{

        self.isScanning = YES;

        [self.captureSession startRunning];

    }];

}

 #pragma mark - DecoderDelegate

+(NSString*)zhengze:(NSString*)str

{

      NSError *error;

    //http+:[^\\s]* 这是检测网址的正则表达式

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"http+:[^\\s]*" options:0 error:&error];//筛选

        if (regex != nil) {

        NSTextCheckingResult *firstMatch = [regex firstMatchInString:str options:0 range:NSMakeRange(0, [str length])];

        if (firstMatch) {

            NSRange resultRange = [firstMatch rangeAtIndex:0];

            //从urlString中截取数据

            NSString *result1 = [str substringWithRange:resultRange];

            NSLog(@"正则表达后的结果%@",result1);

            return result1;            

        }

    }

    return nil;

}

 

 

效果图:

 

开灯可以打开系统的手电筒,相册可以进入系统相册,如果选择的图片中包含有二维码,既可以自动扫描!

 

如有问题可以评论提问,有评必回!!!

2015最后一天,祝大家新年快乐!记得给个赞哦^_^