一对一直播系统开发如何在页面内实现扫描二维码功能

二维码功能方便快捷，深受用户喜好，本文为你们简单介绍，一对一直播系统开发想要实如今APP内实现扫描二维码功能，须要如下几步。

1、首先是二维码的获取和分析，须要一对一直播系统开发源码获取手机摄像头使用权限，设置扫描范围，进入二维码界面后，会对界面进行初始化。

2. // 一、获取摄像设备
3. AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
5. // 二、建立摄像设备输入流
6. AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
8. // 三、建立元数据输出流
9. AVCaptureMetadataOutput *metadataOutput = [[AVCaptureMetadataOutput alloc] init];
10. [metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
11. [metadataOutput setRectOfInterest:CGRectMake((self.view.frame.size.height - 220)*0.5/UIScreen.mainScreen.bounds.size.height,
12. (self.view.frame.size.width - 220)*0.5/UIScreen.mainScreen.bounds.size.width,
13. 220/UIScreen.mainScreen.bounds.size.height,
14. 220/UIScreen.mainScreen.bounds.size.width)];
15. // 设置扫描范围（每个取值0～1，以屏幕右上角为坐标原点）
16. // 注：微信二维码的扫描范围是整个屏幕，这里并无作处理（可不用设置）;
17. // 如需限制扫描框范围，打开下一句注释代码并进行相应调整
18. // metadataOutput.rectOfInterest = CGRectMake(0.05, 0.2, 0.7, 0.6);
20. // 四、建立会话对象
21. _session = [[AVCaptureSession alloc] init];
22. // 并设置会话采集率
23. _session.sessionPreset = AVCaptureSessionPreset1920x1080;
25. // 五、添加元数据输出流到会话对象
26. [_session addOutput:metadataOutput];
28. // 建立摄像数据输出流并将其添加到会话对象上, --> 用于识别光线强弱
29. self.videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
30. [_videoDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
31. [_session addOutput:_videoDataOutput];
33. // 六、添加摄像设备输入流到会话对象
34. [_session addInput:deviceInput];
36. // 七、设置数据输出类型(以下设置为条形码和二维码兼容)，须要将数据输出添加到会话后，才能指定元数据类型，不然会报错
37. metadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];
39. // 八、实例化预览图层, 用于显示会话对象
40. _videoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
41. // 保持纵横比；填充层边界
42. _videoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
43. CGFloat x = 0;
44. CGFloat y = 0;
45. CGFloat w = [UIScreen mainScreen].bounds.size.width;
46. CGFloat h = [UIScreen mainScreen].bounds.size.height;
47. _videoPreviewLayer.frame = CGRectMake(x, y, w, h);
48. [self.view.layer insertSublayer:_videoPreviewLayer atIndex:0];
50. // 九、启动会话
51. [_session startRunning];

2、添加一对一直播系统开发源码扫描涂层，设置扫描蒙版，检测边框、镂空、二维码图标的四个角角落。

//懵层

• (UIView )hudView
  {
  if (!_hudView) {
  _hudView = [[UIView alloc] initWithFrame:CGRectMake(0, 64+statusbarHeight, _window_width, _window_height-64-statusbarHeight)];
  CGFloat x = (self.view.frame.size.width - 220)0.5;
  CGFloat y = (self.view.frame.size.height - 220)0.4;
  CGFloat height = 220;
  //镂空
  CGRect qrRect = CGRectMake(x,y,height, height);
  UIBezierPath path = [UIBezierPath bezierPathWithRoundedRect:self.view.frame cornerRadius:0];
  UIBezierPath circlePath = [UIBezierPath bezierPathWithRect:qrRect];
  [path appendPath:circlePath];
  [path setUsesEvenOddFillRule:YES];
  CAShapeLayer fillLayer = [CAShapeLayer layer];
  fillLayer.path = path.CGPath;
  fillLayer.fillRule = kCAFillRuleEvenOdd;
  fillLayer.fillColor = [UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:0.4].CGColor;
  fillLayer.opacity = 0.5;
  [_hudView.layer addSublayer:fillLayer];

  //白色矩形
  UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRect:CGRectMake(x, y, height, height)];
  CAShapeLayer *shapLayer = [CAShapeLayer layer];
  shapLayer.backgroundColor = UIColor.clearColor.CGColor;
  shapLayer.path = bezierPath.CGPath;
  shapLayer.lineWidth = 0.5;
  shapLayer.strokeColor = UIColor.whiteColor.CGColor;
  shapLayer.fillColor = UIColor.clearColor.CGColor;
  [_hudView.layer addSublayer:shapLayer];
  
  //红色四个角落
  UIBezierPath *cornerBezierPath = [UIBezierPath bezierPath];
  
  [cornerBezierPath moveToPoint:CGPointMake(x, y+30)];//左上角
  [cornerBezierPath addLineToPoint:CGPointMake(x, y)];
  [cornerBezierPath addLineToPoint:CGPointMake(x+30, y)];
  
  [cornerBezierPath moveToPoint:CGPointMake(x+height-30, y)];//右上角
  [cornerBezierPath addLineToPoint:CGPointMake(x+height, y)];
  [cornerBezierPath addLineToPoint:CGPointMake(x+height, y+30)];
  
  [cornerBezierPath moveToPoint:CGPointMake(x+height, y+height-30)];//左上角
  [cornerBezierPath addLineToPoint:CGPointMake(x+height, y+height)];
  [cornerBezierPath addLineToPoint:CGPointMake(x+height-30, y+height)];
  
  [cornerBezierPath moveToPoint:CGPointMake(x+30, y+height)];//左上角
  [cornerBezierPath addLineToPoint:CGPointMake(x, y+height)];
  [cornerBezierPath addLineToPoint:CGPointMake(x, y+height-30)];
  
  CAShapeLayer *cornerShapLayer = [CAShapeLayer layer];
  cornerShapLayer.backgroundColor = UIColor.clearColor.CGColor;
  cornerShapLayer.path = cornerBezierPath.CGPath;
  cornerShapLayer.lineWidth = 3.0;
  cornerShapLayer.strokeColor = [UIColor redColor].CGColor;
  cornerShapLayer.fillColor = UIColor.clearColor.CGColor;
  [_hudView.layer addSublayer:cornerShapLayer];

  }
  return _hudView;
  }

3、扫描完成，对扫描结果进行分析和处理。通常一对一直播源码的扫描结果分为两种。
一、扫描结果分析成功，跳转相关页面
二、扫描结果解析失败，显示暂未识别出扫描结果。

• (void)captureOutput:(AVCaptureOutput )captureOutput didOutputMetadataObjects:(NSArray )metadataObjects fromConnection:(AVCaptureConnection )connection {
  if (metadataObjects != nil && metadataObjects.count > 0) {
  AVMetadataMachineReadableCodeObject obj = metadataObjects[0];
  NSDictionary infoDic = [self convertJsonStringToNSDictionary:[obj stringValue]];br/>NSLog(@"sweepcodeVC--------:%@",infoDic);
  if ([[infoDic valueForKey:@"scope"] isEqual:@"laolaiwang"]) {
  if ([minstr([[infoDic valueForKey:@"data"] valueForKey:@"type"]) isEqual:@"1"]) {
  [_session stopRunning] ;
  otherUserMsgVC person = [[otherUserMsgVC alloc]init];
  person.userID = minstr([[infoDic valueForKey:@"data"] valueForKey:@"uid"]);
  [self.navigationController pushViewController:person animated:YES];
  }else if ([minstr([[infoDic valueForKey:@"data"] valueForKey:@"type"]) isEqual:@"2"]){
  [self loginManagerWithDic:infoDic];
  }

  }

  } else {br/>NSLog(@"暂未识别出扫描的二维码");
  }
  }

以上就是一对一直播源码开发的扫描二维码功能的大致流程实现，该功能对于提升用户感觉和方便用户使用都有帮助，在万物皆可扫一扫的时代背景下，开发这个功能可以增强一对一直播源码开发加强社交性、互动性，知足人们的社交需求。