本文講述如何用系統自帶的東東實現二維碼掃描的功能:點擊當前頁面的某個按鈕，創建掃描VIEW。細心的小伙伴可以發現 title被改變了，返回按鈕被隱藏了。這個代碼自己寫就行了，與本文關系不大。。。綠色的線會上下跑，不要擔心:D

實現效果如下：

　　1.在工程中添加框架AVFoundation.framework

　　2.聲明代理：AVCaptureMetadataOutputObjectsDelegate 。 define 幾個東東用來畫框、畫線：

#define SCANVIEW_EdgeTop 40.0 #define SCANVIEW_EdgeLeft 50.0 #define TINTCOLOR_ALPHA 0.2 //淺色透明度 #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

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　　3.聲明以下屬性：

AVCaptureSession * session;//輸入輸出的中間橋梁UIView *AVCapView;//此 view 用來放置掃描框、取消按鈕、說明 labelUIView *_QrCodeline;//上下移動綠色的線條NSTimer *_timer;

　　4.在某個方法中（我是點擊掃描按鈕）創建掃描界面，開始掃描：

//創建一個 view 來放置掃描區域、說明 label、取消按鈕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：將條形碼或二維碼對準上方區域中心即可";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];//畫上邊框UIView *topView = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft, SCANVIEW_EdgeTop, VIEW_WIDTH- 2 * SCANVIEW_EdgeLeft, 1)];topView.backgroundColor = [UIColor whiteColor];[AVCapView addSubview:topView];//畫左邊框UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft, SCANVIEW_EdgeTop , 1,VIEW_WIDTH - 2 * SCANVIEW_EdgeLeft )];leftView.backgroundColor = [UIColor whiteColor];[AVCapView addSubview:leftView];//畫右邊框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];//畫下邊框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];//畫中間的基準線_QrCodeline = [[UIView alloc] initWithFrame:CGRectMake(SCANVIEW_EdgeLeft + 1, SCANVIEW_EdgeTop, VIEW_WIDTH- 2 * SCANVIEW_EdgeLeft - 1, 2)];_QrCodeline.backgroundColor = [UIColor greenColor];[AVCapView addSubview:_QrCodeline];// 先讓基準線運動一次，避免定時器的時差[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];//創建輸入流AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];//創建輸出流AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];//設置代理 在主線程里刷新 [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];//初始化鏈接對象session = [[AVCaptureSession alloc]init];//高質量采集率 [session setSessionPreset:AVCaptureSessionPresetHigh];[session addInput:input];[session addOutput:output];//設置掃碼支持的編碼格式(如下設置條形碼和二維碼兼容)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];//開始捕獲[session startRunning];

　　5.實現定時器、還有基準線的滾動方法

- (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;}}// 滾來滾去 :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.掃描成功后，想干嘛干嘛，就在這個代理方法里面實現就行了

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

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7.如果用戶不想掃描了，點擊取消按鈕：

- (void)touchAVCancelBtn{[session stopRunning];//攝像也要停止[self stopTimer];//定時器要停止[AVCapView removeFromSuperview];//剛剛創建的 view 要移除 ... }

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轉載于:https://www.cnblogs.com/onlyMyRailGun/p/5320041.html

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