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。

// 1、获取摄像设备
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// 2、创建摄像设备输入流
AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
// 3、创建元数据输出流
AVCaptureMetadataOutput *metadataOutput = [[AVCaptureMetadataOutput alloc] init];
[metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[metadataOutput setRectOfInterest:CGRectMake((self.view.frame.size.height - 220)*0.5/UIScreen.mainScreen.bounds.size.height,
(self.view.frame.size.width - 220)*0.5/UIScreen.mainScreen.bounds.size.width,
220/UIScreen.mainScreen.bounds.size.height,
220/UIScreen.mainScreen.bounds.size.width)];
// 设置扫描范围（每一个取值0～1，以屏幕右上角为坐标原点）
// 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）;
// 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
// metadataOutput.rectOfInterest = CGRectMake(0.05, 0.2, 0.7, 0.6);
// 4、创建会话对象
_session = [[AVCaptureSession alloc] init];
// 并设置会话采集率
_session.sessionPreset = AVCaptureSessionPreset1920x1080;
// 5、添加元数据输出流到会话对象
[_session addOutput:metadataOutput];
// 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
self.videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
[_videoDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
[_session addOutput:_videoDataOutput];
// 6、添加摄像设备输入流到会话对象
[_session addInput:deviceInput];
// 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
metadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];
// 8、实例化预览图层, 用于显示会话对象
_videoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
// 保持纵横比；填充层边界
_videoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
CGFloat x = 0;
CGFloat y = 0;
CGFloat w = [UIScreen mainScreen].bounds.size.width;
CGFloat h = [UIScreen mainScreen].bounds.size.height;
_videoPreviewLayer.frame = CGRectMake(x, y, w, h);
[self.view.layer insertSublayer:_videoPreviewLayer atIndex:0];
// 9、启动会话
[_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]];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体流程实现，该功能对于提高用户感受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，开发这个功能能够加强一对一直播源码开发增强社交性、互动性，满足人们的社交需求。

来源：oschina

链接：https://my.oschina.net/u/4343260/blog/4524424

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