二维码相关

一、生成二维码

1、生成过滤器

CIFilter*filer = [CIFilterfilterWithName:@"CIQRCodeGenerator"];

2、恢复默认设置

[filersetDefaults];

3、向二维码中添加数据

NSString*string = [NSStringstringWithFormat:@"傻屌"];

NSData*data = [stringdataUsingEncoding:NSUTF8StringEncoding];

[filersetValue:dataforKeyPath:@"inputMessage"];

4、从过滤器中获取到二维码

CIImage*ciImage =  [fileroutputImage];

5、把获取到的二维码数据加载到视图中

self.CodeImageView.image= [UIImageimageWithCIImage:ciImage];

二、扫描二维码

// 1、创建捕捉会话

AVCaptureSession*session = [[AVCaptureSessionalloc]init];

// 2、设置捕捉的输入设备

AVCaptureDevice*device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

AVCaptureDeviceInput*inPutDevice = [AVCaptureDeviceInputdeviceInputWithDevice:deviceerror:nil];

[sessionaddInput:inPutDevice];

// 3、设置捕捉的输出数据

AVCaptureMetadataOutput*MetadataOutput = [[AVCaptureMetadataOutputalloc]init];

[MetadataOutputsetMetadataObjectsDelegate:selfqueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0)];

[sessionaddOutput:MetadataOutput];

[MetadataOutputsetMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];

// 4、添加捕捉图层

AVCaptureVideoPreviewLayer*preViewLayer = [AVCaptureVideoPreviewLayerlayerWithSession:session];

preViewLayer.frame=self.view.bounds;

[self.view.layeraddSublayer:preViewLayer];

// 5、执行捕捉

[sessionstartRunning];