生成扫描二维码

1.系统生成二维码

// // ViewController.m // 实验 // // #import "ViewController.h" @interface ViewController () @end @implementation ViewController //模糊 - (UIImage *)generateQRCodeFromString:(NSString *)string { //1. 需要生成二维码的内容 NSData *stringData = [string dataUsingEncoding:NSUTF8StringEncoding]; //2. 二维码生成器 CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; //3. 设置输入参数 [filter setValue:stringData forKey:@"inputMessage"]; //4. 设置识别率 [filter setValue:@"M" forKey:@"inputCorrectionLevel"]; //5. 获取生成的图片 CGImageRef cgImage = [[CIContext contextWithOptions:nil]createCGImage:[filter outputImage] fromRect:[[filter outputImage]extent]]; return [UIImage imageWithCGImage:cgImage]; } //清晰 - (UIImage *)image:(UIImage *)image scale:(CGFloat)scale { CGSize size = image.size; //1. 缩放图片，使生成的二维码变得更清晰 UIGraphicsBeginImageContext(CGSizeMake(size.width * scale, size.width *scale)); CGContextRef context = UIGraphicsGetCurrentContext(); //2. 插值 CGContextSetInterpolationQuality(context, kCGInterpolationNone); //3. 绘制图片 CGContextDrawImage(context, CGContextGetClipBoundingBox(context), image.CGImage); //4. 获取图片 UIImage *preImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); //5. 旋转图片 UIImage *qrImage = [UIImage imageWithCGImage:[preImage CGImage] scale:[preImage scale] orientation:UIImageOrientationDownMirrored]; return qrImage; } -(UIImage *)generateQRCodeWithString:(NSString *)string scale:(CGFloat) scale { NSData *stringData = [string dataUsingEncoding:NSUTF8StringEncoding]; CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; [filter setValue:stringData forKey:@"inputMessage"]; [filter setValue:@"M" forKey:@"inputCorrectionLevel"]; // Render the image into a CoreGraphics image渲染图像到一个CoreGraphics图像 CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:[filter outputImage] fromRect:[[filter outputImage]extent]]; //缩放图片，使生成的二维码变得更清晰 UIGraphicsBeginImageContext(CGSizeMake([[filter outputImage]extent].size.width * scale, [filter outputImage].extent.size.width * scale)); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetInterpolationQuality(context, kCGInterpolationNone); CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage); UIImage *preImage = UIGraphicsGetImageFromCurrentImageContext(); //Cleaning up .清理 UIGraphicsEndImageContext(); CGImageRelease(cgImage); // Rotate the image旋转图像 UIImage *qrImage = [UIImage imageWithCGImage:[preImage CGImage] scale:[preImage scale] orientation:UIImageOrientationDownMirrored]; return qrImage; } - (void)viewDidLoad { [super viewDidLoad]; UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 200, 200)]; [self.view addSubview:imageView]; //生成二维码 UIImage *image = [self generateQRCodeFromString:@"nihaome"]; imageView.image = [self image:image scale:10]; /** * 将图片保存到iPhone本地相册 * UIImage *image 图片对象 * id completionTarget 响应方法对象 * SEL completionSelector 方法 * void *contextInfo */ UIImageWriteToSavedPhotosAlbum(imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil); } - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{ if (error == nil) { NSLog(@"已存入手机相册"); }else{ NSLog(@"保存失败"); } } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end

2.ZBarSDK扫描二维码

ViewController.m文件

#pragma mark - 扫描按钮 - (IBAction)scanning:(id)sender { [self Hidekeyboard]; QRViewController *scanner = [[QRViewController alloc] init]; scanner.block = ^(NSString *str){ NSString *beforeDIDStr = _DIDTextField.text; _DIDTextField.text = str; }; [self.navigationController pushViewController:scanner animated:YES]; }

QRViewController.m文件

// // QRViewController.m // #import "QRViewController.h" #import "ZBarSDK.h" #import "Header.h" #import <AVFoundation/AVFoundation.h> @interface QRViewController () <ZBarReaderViewDelegate,ZBarReaderDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate> { ZBarReaderView *ReaderView; UIImageView * scanZomeBack; UIImageView * readLineView; BOOL is_Anmotion; } // 其他变量 @property (nonatomic,weak) UIActivityIndicatorView *indicator; @end @implementation QRViewController - (void)viewDidLoad { [super viewDidLoad]; self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"<返回" style:UIBarButtonItemStylePlain target:self action:@selector(gotoBack:)]; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"相册" style:UIBarButtonItemStylePlain target:self action:@selector(xiangceClicked:)]; is_Anmotion = NO; [self showLoading]; } -(void)viewWillAppear:(BOOL)animated { // 初始化ZBarReaderView ReaderView =[ZBarReaderView new]; ReaderView.frame = CGRectMake(0, 0, Width, Height); //设置delegate,使用ZBarReaderView的类要实现 ZBarReaderViewDelegate代理。 ReaderView.readerDelegate =self; // 不使用Pinch手势变焦 ReaderView.allowsPinchZoom =NO; ReaderView.showsFPS =NO; ReaderView.tracksSymbols = NO; //关闭闪光灯 ReaderView.torchMode = 0; [self.view addSubview:ReaderView]; //边角 UIImage *hbImage=[UIImage imageNamed:@"twocode_bg"]; scanZomeBack=[[UIImageView alloc] initWithImage:hbImage]; scanZomeBack.clipsToBounds =YES; CGRect mImagerect; if (Width==320) { mImagerect=CGRectMake(60, 150, 200, 200); }else { if (IS_IPHONE_6P) { mImagerect=CGRectMake(107, 180, 200, 200); } else { mImagerect=CGRectMake(87, 180, 200, 200); } } [scanZomeBack setFrame:mImagerect]; [ReaderView addSubview:scanZomeBack]; //扫描区域 ReaderView.scanCrop =CGRectMake(0, 0, 1, 1); // 开始扫描 [ReaderView start]; //扫描动画 [self loopDrawLine]; //我的二维码 UILabel * textLabel =[[UILabel alloc]initWithFrame:CGRectMake(scanZomeBack.frame.origin.x, scanZomeBack.frame.origin.y+scanZomeBack.frame.size.height+10, 200, 25)]; textLabel.text =@"将二维码放入框内,即可自动扫描"; textLabel.font =[UIFont systemFontOfSize:13]; textLabel.textColor =[UIColor whiteColor]; [self.view addSubview:textLabel]; } #pragma mark -- 二维码扫描动画 #pragma mark 扫描动画 -(void)loopDrawLine { CGRect rect = CGRectMake(0, -(scanZomeBack.frame.size.height), (scanZomeBack.frame.size.width), scanZomeBack.frame.size.height); if (readLineView) { [readLineView removeFromSuperview]; } readLineView = [[UIImageView alloc] initWithFrame:rect]; [readLineView setImage:[UIImage imageNamed:@"Qcode_bg"]]; [UIView animateWithDuration:3.0 delay: 0.0 options: UIViewAnimationOptionCurveEaseIn animations:^{ //修改fream的代码写在这里 readLineView.frame =CGRectMake(0, 0, scanZomeBack.frame.size.width, scanZomeBack.frame.size.height); [readLineView setAnimationRepeatCount:0]; } completion:^(BOOL finished){ if (!is_Anmotion) { NSLog(@"---"); [self loopDrawLine]; } }]; [scanZomeBack addSubview:readLineView]; } #pragma mark --二维码回调 - (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image { NSLog(@"%@",symbols); for (ZBarSymbol *symbol in symbols) { NSLog(@"%@", symbol.data); if (_block) { _block(symbol.data); } [ReaderView stop]; // 停止扫描 is_Anmotion = YES; [self.navigationController popViewControllerAnimated:YES]; } } #pragma mark -- 调用相册 -(void)xiangceClicked:(id)sender{ ZBarReaderController *reader = [ZBarReaderController new]; reader.allowsEditing = YES; reader.readerDelegate = self; reader.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; // 相机是否授权 if ([AVCaptureDevice respondsToSelector:@selector(authorizationStatusForMediaType:)]) { if (!([AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo] == AVAuthorizationStatusAuthorized)) { NSLog(@"CaptureDevice not authorized"); } } [self presentViewController:reader animated:YES completion:^{ NSLog(@"跳转成功---"); is_Anmotion = YES; }]; } #pragma mark -- 进入相册回调 // 当选取原始图片或者视频后，调用该方法 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults]; if ([info count]>2) { int quality = 0; ZBarSymbol *bestResult = nil; for(ZBarSymbol *sym in results) { int q = sym.quality; if(quality < q) { quality = q; bestResult = sym; } } [self performSelector: @selector(presentResult:) withObject: bestResult afterDelay: .001]; }else { ZBarSymbol *symbol = nil; for(symbol in results) break; [self performSelector: @selector(presentResult:) withObject: symbol afterDelay: .001]; } [picker dismissViewControllerAnimated:YES completion:^{ }]; } //扫描失败，无法读取二维码信息 - (void) readerControllerDidFailToRead: (ZBarReaderController*) reader withRetry: (BOOL) retry { //retry == YES 选择图片为非二维码 NSLog(@"扫描失败，无法读取二维码信息"); [reader popViewControllerAnimated:YES]; } //取消选择图片 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [picker dismissViewControllerAnimated:YES completion:^{ //重新开始扫描动画 is_Anmotion = NO; }]; } //相册回调内的触发方法 - (void) presentResult: (ZBarSymbol*)sym { if (sym) { if (_block) { _block(sym.data); } [ReaderView stop]; // 停止扫描 is_Anmotion = YES; [self.navigationController popViewControllerAnimated:YES]; } } #pragma mark --返回 -(void)gotoBack:(id)sender { [ReaderView stop]; // 停止扫描 is_Anmotion = YES; [self.navigationController popViewControllerAnimated:YES]; } // 显示菊花 - (void)showLoading { if (!self.indicator) { UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; indicator.backgroundColor = [UIColor clearColor]; indicator.center = self.view.center; indicator.hidden = NO; self.indicator = indicator; [self.view addSubview:indicator]; [self.view bringSubviewToFront:indicator]; } [self.indicator startAnimating]; } // 隐藏菊花 -(void)hideLoading { if (self.indicator && [self.indicator isAnimating]) { [self.indicator stopAnimating]; } } @end