iOS 二维码扫描相关功能实现

#import "QRCodeScanManager.h"#import #import "QRLightManager.h"#import "QRCodeScanView.h"#import "QRCodeHelper.h"

/** 打开手电筒 */+ (void)openFlashLight;/** 关闭手电筒 */+ (void)closeFlashLight;

#pragma mark 打开手电筒+ (void)openFlashLight { AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; NSError *error = nil; if ([captureDevice hasTorch]) {  BOOL locked = [captureDevice lockForConfiguration:&error];  if (locked) {   captureDevice.torchMode = AVCaptureTorchModeOn;   [captureDevice unlockForConfiguration];  } }}#pragma mark 关闭手电筒+ (void)closeFlashLight { AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; if ([device hasTorch]) {  [device lockForConfiguration:nil];  [device setTorchMode:AVCaptureTorchModeOff];  [device unlockForConfiguration]; }}

typedef enum : NSUInteger { CornerLoactionDefault,//默认与边框同中心点 CornerLoactionInside,//在边框线内部 CornerLoactionOutside,//在边框线外部} CornerLoaction;

@property (nonatomic, strong) UIColor *borderColor;/** 边框颜色*/@property (nonatomic, assign) CornerLoaction cornerLocation;/** 边角位置 默认default*/@property (nonatomic, strong) UIColor *cornerColor;/** 边角颜色 默认正保蓝#32d2dc*/@property (nonatomic, assign) CGFloat cornerWidth;/** 边角宽度 默认2.f*/@property (nonatomic, assign) CGFloat backgroundAlpha;/** 扫描区周边颜色的alpha 默认0.5*/@property (nonatomic, assign) CGFloat timeInterval;/** 扫描间隔 默认0.02*/@property (nonatomic, strong) UIButton *lightBtn;/** 闪光灯*/

/** 添加定时器 */- (void)addTimer;/** 移除定时器 */- (void)removeTimer;/** 根据灯光判断 */- (void)lightBtnChangeWithBrightnessValue:(CGFloat)brightnessValue;

- (void)initilize { self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5]; self.borderColor = [UIColor whiteColor]; _cornerLocation = CornerLoactionDefault; _cornerColor = [UIColor colorWithRed:50/255.0f green:210/255.0f blue:220/255.0f alpha:1.0]; _cornerWidth = 2.0; self.timeInterval = 0.02; _backgroundAlpha = 0.5;   [self addSubview:self.lightBtn];}

//空白区域设置 [[[UIColor blackColor] colorWithAlphaComponent:self.backgroundAlpha] setFill]; UIRectFill(rect); //获取上下文，并设置混合模式 -> kCGBlendModeDestinationOut CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetBlendMode(context, kCGBlendModeDestinationOut); //设置空白区 UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRect:CGRectMake(borderX + 0.5 * borderLineW, borderY+ 0.5 * borderLineW, borderW - borderLineW, borderH - borderLineW)]; [bezierPath fill]; //执行混合模式 CGContextSetBlendMode(context, kCGBlendModeNormal);   //边框设置 UIBezierPath *borderPath = [UIBezierPath bezierPathWithRect:CGRectMake(borderX, borderY, borderW, borderH)]; borderPath.lineCapStyle = kCGLineCapButt; borderPath.lineWidth = borderLineW; [self.borderColor set]; [borderPath stroke];   CGFloat cornerLength = 20; //左上角小图标 UIBezierPath *leftTopPath = [UIBezierPath bezierPath]; leftTopPath.lineWidth = self.cornerWidth; [self.cornerColor set];   CGFloat insideExcess = fabs(0.5 * (self.cornerWidth - borderLineW)); CGFloat outsideExcess = 0.5 * (borderLineW + self.cornerWidth); if (self.cornerLocation == CornerLoactionInside) {  [leftTopPath moveToPoint:CGPointMake(borderX + insideExcess, borderY + cornerLength + insideExcess)];  [leftTopPath addLineToPoint:CGPointMake(borderX + insideExcess, borderY + insideExcess)];  [leftTopPath addLineToPoint:CGPointMake(borderX + cornerLength + insideExcess, borderY + insideExcess)]; } else if (self.cornerLocation == CornerLoactionOutside) {  [leftTopPath moveToPoint:CGPointMake(borderX - outsideExcess, borderY + cornerLength - outsideExcess)];  [leftTopPath addLineToPoint:CGPointMake(borderX - outsideExcess, borderY - outsideExcess)];  [leftTopPath addLineToPoint:CGPointMake(borderX + cornerLength - outsideExcess, borderY - outsideExcess)]; } else {  [leftTopPath moveToPoint:CGPointMake(borderX, borderY + cornerLength)];  [leftTopPath addLineToPoint:CGPointMake(borderX, borderY)];  [leftTopPath addLineToPoint:CGPointMake(borderX + cornerLength, borderY)]; } [leftTopPath stroke];

- (void)addTimer { [self addSubview:self.scanningLine]; self.timer = [NSTimer timerWithTimeInterval:self.timeInterval target:self selector:@selector(beginAnimaiton) userInfo:nil repeats:YES]; [[NSRunLoop mainRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];}#pragma mark 动画- (void)beginAnimaiton { static BOOL isOrignPostion = YES;   if (isOrignPostion) {  _scanningLine.y = 0;  isOrignPostion = NO;  [UIView animateWithDuration:self.timeInterval animations:^{   self->_scanningLine.y += 2;  } completion:nil]; } else {  if (_scanningLine.frame.origin.y >= 0) {   CGFloat scanContent_MaxY = self.frame.size.width;   if (_scanningLine.y >= scanContent_MaxY - 10) {    _scanningLine.y = 0;    isOrignPostion = YES;   } else {    [UIView animateWithDuration:0.02 animations:^{     self->_scanningLine.y += 2;          } completion:nil];   }  } else {   isOrignPostion = !isOrignPostion;  } }}

- (void)lightBtnClick:(UIButton *)btn { btn.selected = !btn.selected; if (btn.selected) {  [QRLightManager openFlashLight]; } else {  [QRLightManager closeFlashLight]; }}

//设置二维码读取率 数据类型 当前控制器- (void)setupSessionPreset:(NSString *)sessionPreset metadataObjectTypes:(NSArray *)metadataObjectTypes currentController:(UIViewController *)currentController { if (sessionPreset == nil || metadataObjectTypes == nil || currentController == nil) {  NSException *excp = [NSException exceptionWithName:@"excp" reason:@"setupSessionPreset:metadataObjectTypes:currentController: 方法中的 sessionPreset 参数不能为空" userInfo:nil];  [excp raise]; }   //1、获取摄像设备 AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];   //2、创建设备输入流 AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];   //3、创建数据输出流 AVCaptureMetadataOutput *metadataOutput = [[AVCaptureMetadataOutput alloc] init]; [metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];   //3(1)、创建设备输出流 self.videoDataOutput = [[AVCaptureVideoDataOutput alloc] init]; [_videoDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];   // 设置扫描范围（每一个取值0～1，以屏幕右上角为坐标原点） // 注：微信二维码的扫描范围是整个屏幕，这里并没有做处理（可不用设置）; 如需限制扫描范围，打开下一句注释代码并进行相应调试 // metadataOutput.rectOfInterest = CGRectMake(0.05, 0.2, 0.7, 0.6);   //4、创建会话对象 _session = [[AVCaptureSession alloc] init]; //会话采集率：AVCaptureSessionPresetHigh _session.sessionPreset = sessionPreset;   //5、添加设备输出流到会话对象 [_session addOutput:metadataOutput]; //5(1)添加设备输出流到会话对象；与3(1)构成识别光纤强弱 [_session addOutput:_videoDataOutput];   //6、添加设备输入流到会话对象 [_session addInput:deviceInput];   //7、设置数据输出类型，需要将数据输出添加到会话后，才能指定元数据类型，否则会报错 // 设置扫码支持的编码格式(如下设置条形码和二维码兼容) // @[AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code] metadataOutput.metadataObjectTypes = metadataObjectTypes;   //8、实例化预览图层，传递_session是为了告诉图层将来显示什么内容 _videoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session]; //保持纵横比；填充层边界 _videoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; CGFloat x = 0; CGFloat y = 0; CGFloat w = [UIScreen mainScreen].bounds.size.width; CGFloat h = [UIScreen mainScreen].bounds.size.height; _videoPreviewLayer.frame = CGRectMake(x, y, w, h); [currentController.view.layer insertSublayer:_videoPreviewLayer atIndex:0];   //9、启动会话 [_session startRunning];  }

typedef void(^GetBrightnessBlock)(CGFloat brightness);//用来向外部传递捕获到的亮度值以便于识别何时开启闪光灯，typedef void(^ScanBlock)(NSArray *metadataObjects);//捕获到的结果集合//亮度回调- (void)brightnessChange:(GetBrightnessBlock)getBrightnessBlock;//扫描结果- (void)scanResult:(ScanBlock)scanBlock;

- (void)startRunning { [_session startRunning];}- (void)stopRunning { [_session stopRunning];}

需要遵循：/** 重置根据光线强弱值打开手电筒 delegate方法 */- (void)resetSampleBufferDelegate;/** 取消根据光线强弱值打开手电筒的delegate方法 */- (void)cancelSampleBufferDelegate;- (void)resetSampleBufferDelegate { [_videoDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];}- (void)cancelSampleBufferDelegate { [_videoDataOutput setSampleBufferDelegate:nil queue:dispatch_get_main_queue()];}

#pragma mark 播放扫描提示音- (void)playSoundName:(NSString *)name { NSString *audioFile = [[NSBundle mainBundle] pathForResource:name ofType:nil]; NSURL *fileUrl = [NSURL fileURLWithPath:audioFile]; SystemSoundID soundID = 0; AudioServicesCreateSystemSoundID((__bridge CFURLRef)(fileUrl), &soundID); AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallback, NULL); AudioServicesPlaySystemSound(soundID); // 播放音效}void soundCompleteCallback(SystemSoundID soundID, void *clientData){  }

- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self.scanView addTimer]; [_scanManager startRunning]; [_scanManager resetSampleBufferDelegate];}- (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [self.scanView removeTimer]; [_scanManager stopRunning]; [_scanManager cancelSampleBufferDelegate];}

- (void)setupScanManager { self.scanManager = [QRCodeScanManager sharedManager];   NSArray *arr = @[AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]; [_scanManager setupSessionPreset:AVCaptureSessionPreset1920x1080 metadataObjectTypes:arr currentController:self];   __weak __typeof(self)weakSelf = self; //光扫描结果回调 [_scanManager scanResult:^(NSArray *metadataObjects) {  if (metadataObjects != nil && metadataObjects.count > 0) {   [weakSelf.scanManager playSoundName:@"sound.caf"];   //obj 为扫描结果   AVMetadataMachineReadableCodeObject *obj = metadataObjects[0];   NSString *url = [obj stringValue];   NSLog(@"---url = :%@", url);  } else {   NSLog(@"暂未识别出扫描的二维码");  } }];   //光纤变化回调 [_scanManager brightnessChange:^(CGFloat brightness) {  [weakSelf.scanView lightBtnChangeWithBrightnessValue:brightness]; }];  }

//借助第三方相册- (void)albumBtnClick { TZImagePickerController *pickerController = [[TZImagePickerController alloc] initWithMaxImagesCount:1 delegate:self];   __weak __typeof(self)weakSelf = self;   [pickerController setDidFinishPickingPhotosHandle:^(NSArray *photos, NSArray *assets, BOOL isSelectOriginalPhoto) {  UIImage *image = photos[0];  // CIDetector(CIDetector可用于人脸识别)进行图片解析，从而使我们可以便捷的从相册中获取到二维码  // 声明一个 CIDetector，并设定识别类型 CIDetectorTypeQRCode  // 识别精度  CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];     //取得识别结果  NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];     NSString *resultStr;  if (features.count == 0) {   NSLog(@"暂未识别出二维码");  } else {   for (int index = 0; index < [features count]; index++) {    CIQRCodeFeature *feature = [features objectAtIndex:index];    resultStr = feature.messageString;   }   NSLog(@"---url:%@", resultStr);  } }]; [self presentViewController:pickerController animated:YES completion:nil];}