二維碼功能方便快捷，深受用戶喜愛，本文為大家簡單介紹，一對一直播系統(tǒng)開發(fā)想要實現(xiàn)在APP內(nèi)實現(xiàn)掃描二維碼功能，需要以下幾步。

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一、首先是二維碼的獲取和分析，需要一對一直播系統(tǒng)開發(fā)源碼獲取手機攝像頭使用權(quán)限，設(shè)置掃描范圍，進入二維碼界面后，會對界面進行初始化。

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2. ???// 1、獲取攝像設(shè)備

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

4. ???

5. ???// 2、創(chuàng)建攝像設(shè)備輸入流

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

7. ???

8. ???// 3、創(chuàng)建元數(shù)據(jù)輸出流

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. ???// 設(shè)置掃描范圍（每一個取值0～1，以屏幕右上角為坐標原點）

16. ???// 注：微信二維碼的掃描范圍是整個屏幕，這里并沒有做處理（可不用設(shè)置）;

17. ???// 如需限制掃描框范圍，打開下一句注釋代碼并進行相應(yīng)調(diào)整

18. ???// ???metadataOutput.rectOfInterest = CGRectMake(0.05, 0.2, 0.7, 0.6);

19. ???

20. ???// 4、創(chuàng)建會話對象

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

22. ???// 并設(shè)置會話采集率

23. ???_session.sessionPreset = AVCaptureSessionPreset1920x1080;

24. ???

25. ???// 5、添加元數(shù)據(jù)輸出流到會話對象

26. ???[_session addOutput:metadataOutput];

27. ???

28. ???// 創(chuàng)建攝像數(shù)據(jù)輸出流并將其添加到會話對象上, ?--> 用于識別光線強弱

29. ???self.videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];

30. ???[_videoDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];

31. ???[_session addOutput:_videoDataOutput];

32. ???

33. ???// 6、添加攝像設(shè)備輸入流到會話對象

34. ???[_session addInput:deviceInput];

35. ???

36. ???// 7、設(shè)置數(shù)據(jù)輸出類型(如下設(shè)置為條形碼和二維碼兼容)，需要將數(shù)據(jù)輸出添加到會話后，才能指定元數(shù)據(jù)類型，否則會報錯

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

38. ???

39. ???// 8、實例化預(yù)覽圖層, 用于顯示會話對象

40. ???_videoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];

41. ???// 保持縱橫比；填充層邊界

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、啟動會話

51. ???[_session startRunning];

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二、添加一對一直播系統(tǒng)開發(fā)源碼掃描涂層，設(shè)置掃描蒙版，檢測邊框、鏤空、二維碼圖標的四個角角落。

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//懵層

- (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;

????????//鏤空

????????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];

????????

????????//紅色四個角落

????????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;

}

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三、掃描完成，對掃描結(jié)果進行分析和處理。一般一對一直播源碼的掃描結(jié)果分為兩種。

1、掃描結(jié)果分析成功，跳轉(zhuǎn)相關(guān)頁面

2、掃描結(jié)果解析失敗，顯示暫未識別出掃描結(jié)果。

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- (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];

????????????}

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????????}

????} else {

????????NSLog(@"暫未識別出掃描的二維碼");

????}

}

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以上就是一對一直播源碼開發(fā)的掃描二維碼功能的大體流程實現(xiàn)，該功能對于提高用戶感受和方便用戶使用都有幫助，在萬物皆可掃一掃的時代背景下，開發(fā)這個功能能夠加強一對一直播源碼開發(fā)增強社交性、互動性，滿足人們的社交需求。