iOS 原生二维码的扫描详解(代码)

来源：互联网发布：矩阵的f范数怎么求编辑：程序博客网时间：2024/04/30 14:06
#import <AVFoundation/AVFoundation.h> // 要引入static const CGFloat kBorderW = 100;static const CGFloat kMargin = 30;@interface Scan_VC ()<UIAlertViewDelegate,AVCaptureMetadataOutputObjectsDelegate,UINavigationControllerDelegate, UIImagePickerControllerDelegate>{        }@property (nonatomic, strong) AVCaptureSession *session;@property (nonatomic, weak)   UIView *maskView;@property (nonatomic, strong) UIView *scanWindow;@property (nonatomic, strong) UIImageView *scanNetImageView;@end@implementation Scan_VC-(void)viewWillAppear:(BOOL)animated{        self.navigationController.navigationBar.hidden=YES;    [self resumeAnimation];    }-(void)viewDidDisappear:(BOOL)animated{        self.navigationController.navigationBar.hidden=NO;    }- (void)viewDidLoad {    [super viewDidLoad];    //这个属性必须打开否则返回的时候会出现黑边    self.view.clipsToBounds=YES;    //1.遮罩    [self setupMaskView];    //2.下边栏    [self setupBottomBar];    //3.提示文本    [self setupTipTitleView];    //4.顶部导航    [self setupNavView];    //5.扫描区域    [self setupScanWindowView];    //6.开始动画    [self beginScanning];        [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(resumeAnimation) name:@"EnterForeground" object:nil];   }-(void)setupTipTitleView{        //1.补充遮罩        UIView*mask=[[UIView alloc]initWithFrame:CGRectMake(0, _maskView.sd_y+_maskView.sd_height, self.view.sd_width, kBorderW)];    mask.backgroundColor=[UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];    [self.view addSubview:mask];        //2.操作提示    UILabel * tipLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, self.view.sd_height*0.9-kBorderW*2, self.view.bounds.size.width, kBorderW)];    tipLabel.text = @"将取景框对准二维码，即可自动扫描";    tipLabel.textColor = [UIColor whiteColor];    tipLabel.textAlignment = NSTextAlignmentCenter;    tipLabel.lineBreakMode = NSLineBreakByWordWrapping;    tipLabel.numberOfLines = 2;    tipLabel.font=[UIFont systemFontOfSize:12];    tipLabel.backgroundColor = [UIColor clearColor];    [self.view addSubview:tipLabel];    }-(void)setupNavView{        //1.返回        UIButton *backBtn=[UIButton buttonWithType:UIButtonTypeCustom];    backBtn.frame = CGRectMake(20, 30, 25, 25);    [backBtn setBackgroundImage:[UIImage imageNamed:@"qrcode_scan_titlebar_back_nor"] forState:UIControlStateNormal];    backBtn.contentMode=UIViewContentModeScaleAspectFit;    [backBtn addTarget:self action:@selector(disMiss) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:backBtn];        //2.相册        UIButton * albumBtn=[UIButton buttonWithType:UIButtonTypeCustom];    albumBtn.frame = CGRectMake(0, 0, 35, 49);    albumBtn.center=CGPointMake(self.view.sd_width/2, 20+49/2.0);    [albumBtn setBackgroundImage:[UIImage imageNamed:@"qrcode_scan_btn_photo_down"] forState:UIControlStateNormal];    albumBtn.contentMode=UIViewContentModeScaleAspectFit;    [albumBtn addTarget:self action:@selector(myAlbum) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:albumBtn];        //3.闪光灯        UIButton * flashBtn=[UIButton buttonWithType:UIButtonTypeCustom];    flashBtn.frame = CGRectMake(self.view.sd_width-55,20, 35, 49);    [flashBtn setBackgroundImage:[UIImage imageNamed:@"qrcode_scan_btn_flash_down"] forState:UIControlStateNormal];    flashBtn.contentMode=UIViewContentModeScaleAspectFit;    [flashBtn addTarget:self action:@selector(openFlash:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:flashBtn];    }- (void)setupMaskView{    UIView *mask = [[UIView alloc] init];    _maskView = mask;        mask.layer.borderColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7].CGColor;    mask.layer.borderWidth = kBorderW;        mask.bounds = CGRectMake(0, 0, self.view.sd_width + kBorderW + kMargin , self.view.sd_width + kBorderW + kMargin);    mask.center = CGPointMake(self.view.sd_width * 0.5, self.view.sd_height * 0.5);    mask.sd_y = 0;        [self.view addSubview:mask];}- (void)setupBottomBar{    //1.下边栏    UIView *bottomBar = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.sd_height * 0.9, self.view.sd_width, self.view.sd_height * 0.1)];    bottomBar.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.8];        [self.view addSubview:bottomBar];        //2.我的二维码    UIButton * myCodeBtn=[UIButton buttonWithType:UIButtonTypeCustom];    myCodeBtn.frame = CGRectMake(0,0, self.view.sd_height * 0.1*35/49, self.view.sd_height * 0.1);    myCodeBtn.center=CGPointMake(self.view.sd_width/2, self.view.sd_height * 0.1/2);    [myCodeBtn setImage:[UIImage imageNamed:@"qrcode_scan_btn_myqrcode_down"] forState:UIControlStateNormal];     myCodeBtn.contentMode=UIViewContentModeScaleAspectFit;        [myCodeBtn addTarget:self action:@selector(myCode) forControlEvents:UIControlEventTouchUpInside];    [bottomBar addSubview:myCodeBtn];       }- (void)setupScanWindowView{    CGFloat scanWindowH = self.view.sd_width - kMargin * 2;    CGFloat scanWindowW = self.view.sd_width - kMargin * 2;    _scanWindow = [[UIView alloc] initWithFrame:CGRectMake(kMargin, kBorderW, scanWindowW, scanWindowH)];    _scanWindow.clipsToBounds = YES;    [self.view addSubview:_scanWindow];    _scanNetImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"scan_net"]];    CGFloat buttonWH = 18;        UIButton *topLeft = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWH, buttonWH)];    [topLeft setImage:[UIImage imageNamed:@"scan_1"] forState:UIControlStateNormal];    [_scanWindow addSubview:topLeft];        UIButton *topRight = [[UIButton alloc] initWithFrame:CGRectMake(scanWindowW - buttonWH, 0, buttonWH, buttonWH)];    [topRight setImage:[UIImage imageNamed:@"scan_2"] forState:UIControlStateNormal];    [_scanWindow addSubview:topRight];        UIButton *bottomLeft = [[UIButton alloc] initWithFrame:CGRectMake(0, scanWindowH - buttonWH, buttonWH, buttonWH)];    [bottomLeft setImage:[UIImage imageNamed:@"scan_3"] forState:UIControlStateNormal];    [_scanWindow addSubview:bottomLeft];        UIButton *bottomRight = [[UIButton alloc] initWithFrame:CGRectMake(topRight.sd_x, bottomLeft.sd_y, buttonWH, buttonWH)];    [bottomRight setImage:[UIImage imageNamed:@"scan_4"] forState:UIControlStateNormal];    [_scanWindow addSubview:bottomRight];}- (void)beginScanning{    //获取摄像设备    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    //创建输入流    AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];    if (!input) return;    //创建输出流    AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];    //设置代理 在主线程里刷新    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];    //设置有效扫描区域    CGRect scanCrop=[self getScanCrop:_scanWindow.bounds readerViewBounds:self.view.frame];     output.rectOfInterest = scanCrop;    //初始化链接对象    _session = [[AVCaptureSession alloc]init];    //高质量采集率    [_session setSessionPreset:AVCaptureSessionPresetHigh];        [_session addInput:input];    [_session addOutput:output];    //设置扫码支持的编码格式(如下设置条形码和二维码兼容)    output.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];        AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];    layer.videoGravity=AVLayerVideoGravityResizeAspectFill;    layer.frame=self.view.layer.bounds;    [self.view.layer insertSublayer:layer atIndex:0];    //开始捕获    [_session startRunning];}-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{    if (metadataObjects.count>0) {        [_session stopRunning];        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex : 0 ];                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"扫描结果" message:metadataObject.stringValue delegate:self cancelButtonTitle:@"退出" otherButtonTitles:@"再次扫描", nil];        [alert show];    }}#pragma mark-> 我的相册-(void)myAlbum{        NSLog(@"我的相册");    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){        //1.初始化相册拾取器        UIImagePickerController *controller = [[UIImagePickerController alloc] init];        //2.设置代理        controller.delegate = self;        //3.设置资源：        /**         UIImagePickerControllerSourceTypePhotoLibrary,相册         UIImagePickerControllerSourceTypeCamera,相机         UIImagePickerControllerSourceTypeSavedPhotosAlbum,照片库         */        controller.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;        //4.随便给他一个转场动画        controller.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;        [self presentViewController:controller animated:YES completion:NULL];            }else{                UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"设备不支持访问相册，请在设置->隐私->照片中进行设置！" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alert show];    }    }#pragma mark-> imagePickerController delegate- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    //1.获取选择的图片    UIImage *image = info[UIImagePickerControllerOriginalImage];    //2.初始化一个监测器    CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];        [picker dismissViewControllerAnimated:YES completion:^{        //监测到的结果数组        NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];        if (features.count >=1) {            /**结果对象 */            CIQRCodeFeature *feature = [features objectAtIndex:0];            NSString *scannedResult = feature.messageString;            UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"扫描结果" message:scannedResult delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];            [alertView show];                  }        else{            UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"该图片没有包含一个二维码！" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];            [alertView show];                    }              }];        }#pragma mark-> 闪光灯-(void)openFlash:(UIButton*)button{        NSLog(@"闪光灯");    button.selected = !button.selected;    if (button.selected) {        [self turnTorchOn:YES];    }    else{        [self turnTorchOn:NO];    }    }#pragma mark-> 我的二维码-(void)myCode{        NSLog(@"我的二维码");    ViewController2*vc=[[ViewController2 alloc]init];    [self.navigationController pushViewController:vc animated:YES];        }#pragma mark-> 开关闪光灯- (void)turnTorchOn:(BOOL)on{        Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");    if (captureDeviceClass != nil) {        AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];                if ([device hasTorch] && [device hasFlash]){                        [device lockForConfiguration:nil];            if (on) {                [device setTorchMode:AVCaptureTorchModeOn];                [device setFlashMode:AVCaptureFlashModeOn];                            } else {                [device setTorchMode:AVCaptureTorchModeOff];                [device setFlashMode:AVCaptureFlashModeOff];            }            [device unlockForConfiguration];        }    }}#pragma mark 恢复动画- (void)resumeAnimation{    CAAnimation *anim = [_scanNetImageView.layer animationForKey:@"translationAnimation"];    if(anim){        // 1. 将动画的时间偏移量作为暂停时的时间点        CFTimeInterval pauseTime = _scanNetImageView.layer.timeOffset;        // 2. 根据媒体时间计算出准确的启动动画时间，对之前暂停动画的时间进行修正        CFTimeInterval beginTime = CACurrentMediaTime() - pauseTime;                // 3. 要把偏移时间清零        [_scanNetImageView.layer setTimeOffset:0.0];        // 4. 设置图层的开始动画时间        [_scanNetImageView.layer setBeginTime:beginTime];                [_scanNetImageView.layer setSpeed:1.0];            }else{                CGFloat scanNetImageViewH = 241;        CGFloat scanWindowH = self.view.sd_width - kMargin * 2;        CGFloat scanNetImageViewW = _scanWindow.sd_width;            _scanNetImageView.frame = CGRectMake(0, -scanNetImageViewH, scanNetImageViewW, scanNetImageViewH);        CABasicAnimation *scanNetAnimation = [CABasicAnimation animation];        scanNetAnimation.keyPath = @"transform.translation.y";        scanNetAnimation.byValue = @(scanWindowH);        scanNetAnimation.duration = 1.0;        scanNetAnimation.repeatCount = MAXFLOAT;        [_scanNetImageView.layer addAnimation:scanNetAnimation forKey:@"translationAnimation"];        [_scanWindow addSubview:_scanNetImageView];    }        }#pragma mark-> 获取扫描区域的比例关系-(CGRect)getScanCrop:(CGRect)rect readerViewBounds:(CGRect)readerViewBounds{        CGFloat x,y,width,height;        x = (CGRectGetHeight(readerViewBounds)-CGRectGetHeight(rect))/2/CGRectGetHeight(readerViewBounds);    y = (CGRectGetWidth(readerViewBounds)-CGRectGetWidth(rect))/2/CGRectGetWidth(readerViewBounds);    width = CGRectGetHeight(rect)/CGRectGetHeight(readerViewBounds);    height = CGRectGetWidth(rect)/CGRectGetWidth(readerViewBounds);        return CGRectMake(x, y, width, height);    }
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