一对一直播系统开发如何在页面内实现扫描二维码功能

昵称70678147 2020-08-21

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二维码功能方便快捷，深受用户喜爱，本文为大家简单介绍，一对一直播系统开发想要实现在APP内实现扫描二维码功能，需要以下几步。

一、首先是二维码的获取和分析，需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. // 1、获取摄像设备

3. AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

5. // 2、创建摄像设备输入流

6. AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

8. // 3、创建元数据输出流

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（每一个取值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，这里并没有做处理（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);

19.

20. // 4、创建会话对象

21. _session = [[AVCaptureSession alloc] init];

22. // 并设置会话采集率

23. _session.sessionPreset = AVCaptureSessionPreset1920x1080;

24.

25. // 5、添加元数据输出流到会话对象

26. [_session addOutput:metadataOutput];

27.

28. // 创建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];

32.

33. // 6、添加摄像设备输入流到会话对象

34. [_session addInput:deviceInput];

35.

36. // 7、设置数据输出类型(如下设置为条形码和二维码兼容)，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

37. metadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];

38.

39. // 8、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];

49.

50. // 9、启动会话

51. [_session startRunning];

二、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;

}

三、扫描完成，对扫描结果进行分析和处理。一般一对一直播源码的扫描结果分为两种。

1、扫描结果分析成功，跳转相关页面

2、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]];

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];