RN二维码生成&扫描

生成二维码

通过滤镜生成二维码====》具体代码如下

#import <CoreImage/CoreImage.h>

- (void)creatQRCodeImage {
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
      //创建过滤器
      CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
     //恢复默认设置
      [filter setDefaults];
     //添加数据
      NSData *data = [@"wangzhepeng" dataUsingEncoding:NSUTF8StringEncoding];
      [filter setValue:data forKey:@"inputMessage"];
      //生成二维码（有点模糊）
       CIImage *ciImage = [filter outputImage];
      /**生成高清图片 */
       CGAffineTransform transform = CGAffineTransformMakeScale(10, 10);
       CIImage *transformedImage = [ciImage imageByApplyingTransform:transform];
       CIContext *context = [CIContext contextWithOptions:nil];
       CGImageRef cgImage = [context createCGImage:transformedImage fromRect:transformedImage.extent];
       UIImage *qrImage = [UIImage imageWithCGImage:cgImage scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];
       CGImageRelease(cgImage);
       if (!qrImage) {
           //二维码中添加头像
           qrImage = [self qrcodeImage:qrImage addAvatar:nil scale:0.2];
       }
       dispatch_async(dispatch_get_main_queue(), ^{
          img = qrImage;
          self.qrImageView.image = qrImage;
       });
   });
}

- (UIImage *)qrcodeImage:(UIImage *)qrImage addAvatar:(UIImage *)avatar scale:(CGFloat)scale {
   CGFloat screenScale = [UIScreen mainScreen].scale;
   CGRect rect = CGRectMake(0, 0, qrImage.size.width * screenScale, qrImage.size.height * screenScale);
   UIGraphicsBeginImageContextWithOptions(rect.size, YES, screenScale);
   [qrImage drawInRect:rect];
   CGSize avatarSize = CGSizeMake(rect.size.width * scale, rect.size.height * scale);
   CGFloat x = (rect.size.width - avatarSize.width) * 0.5;
   CGFloat y = (rect.size.height - avatarSize.height) * 0.5;
   [avatar drawInRect:CGRectMake(x, y, avatarSize.width, avatarSize.height)];
   UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();
   return [UIImage imageWithCGImage:result.CGImage scale:screenScale orientation:UIImageOrientationUp];
}

- (UIImageView *)qrImageView {
   if (_qrImageView == nil) {
       _qrImageView = [[UIImageView alloc] initWithFrame:CGRectMake(80, 80, kScreenW-160, kScreenW-160)];
       [self.view addSubview:_qrImageView];
   }
   return _qrImageView;
}

扫描二维码

- (void)captureSessionScanQRcodeImage {
      AVCaptureSession *session = [[AVCaptureSession alloc] init];
      AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
      AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
      if ([session canAddInput:input]) {
          [session addInput:input];    
      }
      AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
      if ([session canAddOutput:output]) {
          [session addOutput:output];
      }
  // 可识别的类型
      [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
      [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
      AVCaptureVideoPreviewLayer *preLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
      preLayer.frame = CGRectMake(80, CGRectGetMaxY(self.qrImageView.frame)+20, kScreenW-160, kScreenW-160);
    //填充方式这步很重要
      preLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
      [self.view.layer addSublayer:preLayer];
      [session startRunning];
}

#pragma mark -- 扫码成功的回调方法
- (void)captureOutput:(AVCaptureOutput *)output didOutputMetadataObjects:(NSArray<__kindof AVMetadataObject *> *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
      NSString *content = @"";  
      AVMetadataMachineReadableCodeObject *metadata = metadataObjects.firstObject;
      content = metadata.stringValue;
      if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:content]]) {
          [[UIApplication sharedApplication] openURL:[NSURL URLWithString:content]];
    }
}

//========分割线 下面是扫码成功的提示  可选择添加=========
- (void)playBeep{
      SystemSoundID soundID;
      AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"滴-2"ofType:@"mp3"]], &soundID);
      AudioServicesPlaySystemSound(soundID);
      AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}

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