iOS系统原生二维码条形码扫描

　本文讲述如何用系统自带的东东实现二维码扫描的功能:点击当前页面的某个按钮，创建扫描VIEW。细心的小伙伴可以发现 title被改变了，返回按钮被隐藏了。这个代码自己写就行了，与本文关系不大。。。绿色的线会上下跑，不要担心:D

实现效果如下：

　　1.在工程中添加框架AVFoundation.framework

　　2.声明代理：AVCaptureMetadataOutputObjectsDelegate 。 define 几个东东用来画框、画线：

#define SCANVIEW_EdgeTop 40.0 #define SCANVIEW_EdgeLeft 50.0 #define TINTCOLOR_ALPHA 0.2 //浅色透明度 #define DARKCOLOR_ALPHA 0.5 //深色透明度 #define VIEW_WIDTH [UIScreen mainScreen].bounds.size.width #define VIEW_HEIGHT [UIScreen mainScreen].bounds.size.height

 

　　3.声明以下属性：

AVCaptureSession * session;//输入输出的中间桥梁UIView *AVCapView;//此 view 用来放置扫描框、取消按钮、说明 labelUIView *_QrCodeline;//上下移动绿色的线条NSTimer *_timer;

　　4.在某个方法中（我是点击扫描按钮）创建扫描界面，开始扫描：

//创建一个 view 来放置扫描区域、说明 label、取消按钮UIView *tempView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, [UIScreen mainScreen].bounds.size.height )];AVCapView = tempView;AVCapView.backgroundColor = [UIColor colorWithRed:54.f/255 green:53.f/255 blue:58.f/255 alpha:1];UIButton *cancelBtn = [[UIButton alloc]initWithFrame:CGRectMake(15, [UIScreen mainScreen].bounds.size.height - 100, 50, 25)];UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(15, 268, 290, 60)];label.numberOfLines = 0;label.text = @"小提示：将条形码或二维码对准上方区域中心即可";label.textColor = [UIColor grayColor];[cancelBtn setTitle:@"取消" forState: UIControlStateNormal];[cancelBtn setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];[cancelBtn addTarget:self action:@selector(touchAVCancelBtn) forControlEvents:UIControlEventTouchUpInside];[AVCapView addSubview:label];[AVCapView addSubview:cancelBtn];[self.view addSubview:AVCapView];//画上边框UIView *topView = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft, SCANVIEW_EdgeTop, VIEW_WIDTH- 2 * SCANVIEW_EdgeLeft, 1)];topView.backgroundColor = [UIColor whiteColor];[AVCapView addSubview:topView];//画左边框UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft, SCANVIEW_EdgeTop , 1,VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft )];leftView.backgroundColor = [UIColor whiteColor];[AVCapView addSubview:leftView];//画右边框UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft + VIEW_WIDTH- 2 * SCANVIEW_EdgeLeft, SCANVIEW_EdgeTop , 1,VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft + 1)];rightView.backgroundColor = [UIColor whiteColor];[AVCapView addSubview:rightView];//画下边框UIView *downView = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft, SCANVIEW_EdgeTop + VIEW_WIDTH- 2 * SCANVIEW_EdgeLeft,VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft ,1 )];downView.backgroundColor = [UIColor whiteColor];[AVCapView addSubview:downView];//画中间的基准线_QrCodeline = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft + 1, SCANVIEW_EdgeTop, VIEW_WIDTH- 2 * SCANVIEW_EdgeLeft - 1, 2)];_QrCodeline.backgroundColor = [UIColor greenColor];[AVCapView addSubview:_QrCodeline];// 先让基准线运动一次，避免定时器的时差[UIView animateWithDuration:1.2 animations:^{_QrCodeline.frame = CGRectMake(SCANVIEW_EdgeLeft + 1, VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft + SCANVIEW_EdgeTop , VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft - 1, 2);}];[self performSelector:@selector(createTimer) withObject:nil afterDelay:0.4];AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];//创建输入流AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];//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()];//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 = CGRectMake(SCANVIEW_EdgeLeft, SCANVIEW_EdgeTop, VIEW_WIDTH- 2 * SCANVIEW_EdgeLeft, 220);[AVCapView.layer insertSublayer:layer atIndex:0];//开始捕获[session startRunning];

　　5.实现定时器、还有基准线的滚动方法

- (void)createTimer {_timer=[NSTimer scheduledTimerWithTimeInterval:1.1 target:self selector:@selector(moveUpAndDownLine) userInfo:nil repeats:YES]; }- (void)stopTimer {if ([_timer isValid] == YES) {[_timer invalidate];_timer = nil;}}// 滚来滚去 :D :D :D - (void)moveUpAndDownLine {CGFloat YY = _QrCodeline.frame.origin.y;if (YY != VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft + SCANVIEW_EdgeTop ) {[UIView animateWithDuration:1.2 animations:^{_QrCodeline.frame = CGRectMake(SCANVIEW_EdgeLeft + 1, VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft + SCANVIEW_EdgeTop , VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft - 1,2);}];}else {[UIView animateWithDuration:1.2 animations:^{_QrCodeline.frame = CGRectMake(SCANVIEW_EdgeLeft + 1, SCANVIEW_EdgeTop, VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft - 1,2);}];} }

6.扫描成功后，想干嘛干嘛，就在这个代理方法里面实现就行了

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{if (metadataObjects.count>0) {//[session stopRunning];AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex : 0 ];//输出扫描字符串NSLog(@"%@",metadataObject.stringValue);[session stopRunning];[self stopTimer];[AVCapView removeFromSuperview];..... } }

 

7.如果用户不想扫描了，点击取消按钮：

- (void)touchAVCancelBtn{[session stopRunning];//摄像也要停止[self stopTimer];//定时器要停止[AVCapView removeFromSuperview];//刚刚创建的 view 要移除 ... }

 

转载于:https://www.cnblogs.com/onlyMyRailGun/p/5320041.html

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