怎么在iOS中实现二维码扫描功能
这篇文章将为大家详细讲解有关怎么在iOS中实现二维码扫描功能,文章内容质量较高,因此小编分享给大家做个参考,希望大家阅读完这篇文章后对相关知识有一定的了解。
创新互联公司主要从事成都做网站、成都网站制作、成都外贸网站建设、网页设计、企业做网站、公司建网站等业务。立足成都服务孝昌,10余年网站建设经验,价格优惠、服务专业,欢迎来电咨询建站服务:13518219792
控件封装后主要结构如图:
如图中代码目录,vender里面放的是UIView+Frame分类,Resource里面放的是图片声音资源,TZImagePickerController是第三方相册,用来获取相册中的二维码识别的。主要的就是以QR开头的文件,我们具体说一说。
QRCode.h
这个文件主要放的是各个文件的头文件,方便在各处调用
#import "QRCodeScanManager.h" #import #import "QRLightManager.h" #import "QRCodeScanView.h" #import "QRCodeHelper.h"
QRLightManager
这个类是用来开启关闭闪光灯的
/** 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]; } }
QRCodeScanView
这个类是将这个界面单独封装出来,便于自定义
在.h文件中有个枚举用来标识二维码扫描四周角标的位置:
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;
自定义view各个属性:
@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*/
暴露外部调用的方法:
/** 添加定时器 */ - (void)addTimer; /** 移除定时器 */ - (void)removeTimer; /** 根据灯光判断 */ - (void)lightBtnChangeWithBrightnessValue:(CGFloat)brightnessValue;
初始化默认值:
- (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]; }
重写view的drawRect方法,在这个方法里面绘制scanView的边框和边角
//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];
增加定时器以及开始动画:
- (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; } } }
闪光灯按钮点击事件,开启关闭闪光灯:
- (void)lightBtnClick:(UIButton *)btn { btn.selected = !btn.selected; if (btn.selected) { [QRLightManager openFlashLight]; } else { [QRLightManager closeFlashLight]; } }
QRCodeScanManager
这个单例用来控制所有的关于二维码扫描的事件
初始开启session 会话
//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]; }
block:
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){ }
注:这里只是截取部分重要代码,具体功能我会将代码放到GitHub上,代码里注释也写的很明白
使用功能
开启、结束定时器
开启、关闭session会话
启用、移除sampleBuffer代理
- (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]; }
初始化scanManager
- (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]; }]; }
从相册识别二维码:
//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]; }
关于怎么在iOS中实现二维码扫描功能就分享到这里了,希望以上内容可以对大家有一定的帮助,可以学到更多知识。如果觉得文章不错,可以把它分享出去让更多的人看到。
当前题目:怎么在iOS中实现二维码扫描功能
链接URL:http://pwwzsj.com/article/igpsps.html