iOS二维码的生成和扫描
本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下
属性
@property(strong,nonatomic)AVCaptureDevice*device; @property(strong,nonatomic)AVCaptureDeviceInput*input; @property(strong,nonatomic)AVCaptureMetadataOutput*output; @property(strong,nonatomic)AVCaptureSession*session; @property(strong,nonatomic)AVCaptureVideoPreviewLayer*layer; @property(nonatomic,strong)UIImageView*imageView;
二维码的生成
//1.创建过滤器 CIFilter*filter=[CIFilterfilterWithName:@"CIQRCodeGenerator"]; //2.恢复默认 [filtersetDefaults]; //3.给过滤器添加数据(正则表达式/账号和密码) NSString*dataString=@"http://www.520it.com"; NSData*data=[dataStringdataUsingEncoding:NSUTF8StringEncoding]; [filtersetValue:dataforKeyPath:@"inputMessage"]; //4.获取输出的二维码 CIImage*outputImage=[filteroutputImage]; //因为生成的二维码模糊，所以通过createNonInterpolatedUIImageFormCIImage:outputImage来获得高清的二维码图片 //5.显示二维码 self.imageView.image=[selfcreateNonInterpolatedUIImageFormCIImage:outputImagewithSize:200];
*createNonInterpolatedUIImageFormCIImage:outputImage方法的实现
/**
*根据CIImage生成指定大小的UIImage
*
*@paramimageCIImage
*@paramsize图片宽度
*/
-(UIImage*)createNonInterpolatedUIImageFormCIImage:(CIImage*)imagewithSize:(CGFloat)size
{
CGRectextent=CGRectIntegral(image.extent);
CGFloatscale=MIN(size/CGRectGetWidth(extent),size/CGRectGetHeight(extent));
//1.创建bitmap;
size_twidth=CGRectGetWidth(extent)*scale;
size_theight=CGRectGetHeight(extent)*scale;
CGColorSpaceRefcs=CGColorSpaceCreateDeviceGray();
CGContextRefbitmapRef=CGBitmapContextCreate(nil,width,height,8,0,cs,(CGBitmapInfo)kCGImageAlphaNone);
CIContext*context=[CIContextcontextWithOptions:nil];
CGImageRefbitmapImage=[contextcreateCGImage:imagefromRect:extent];
CGContextSetInterpolationQuality(bitmapRef,kCGInterpolationNone);
CGContextScaleCTM(bitmapRef,scale,scale);
CGContextDrawImage(bitmapRef,extent,bitmapImage);
//2.保存bitmap到图片
CGImageRefscaledImage=CGBitmapContextCreateImage(bitmapRef);
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);
return[UIImageimageWithCGImage:scaledImage];
}
二维码的扫描
//1.创建捕捉会话 AVCaptureSession*session=[[AVCaptureSessionalloc]init]; self.session=session; //2.添加输入设备(数据从摄像头输入) AVCaptureDevice*device=[AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput*input=[AVCaptureDeviceInputdeviceInputWithDevice:deviceerror:nil]; [sessionaddInput:input]; //3.添加输出数据(示例对象-->类对象-->元类对象-->根元类对象) AVCaptureMetadataOutput*output=[[AVCaptureMetadataOutputalloc]init]; [outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()]; [sessionaddOutput:output]; //3.1.设置输入元数据的类型(类型是二维码数据) [outputsetMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]]; //4.添加扫描图层 AVCaptureVideoPreviewLayer*layer=[AVCaptureVideoPreviewLayerlayerWithSession:session]; layer.frame=self.view.bounds; [self.view.layeraddSublayer:layer]; self.layer=layer; //5.开始扫描 [sessionstartRunning];
*扫描到结果后会调用的方法
//当扫描到数据时就会执行该方法
-(void)captureOutput:(AVCaptureOutput*)captureOutputdidOutputMetadataObjects:(NSArray*)metadataObjectsfromConnection:(AVCaptureConnection*)connection
{
if(metadataObjects.count>0){
//获得扫描数据，最后一个时最新扫描的数据
AVMetadataMachineReadableCodeObject*object=[metadataObjectslastObject];
NSLog(@"%@",object.stringValue);
//停止扫描
[self.sessionstopRunning];
//将预览图层移除
[self.layerremoveFromSuperlayer];
}else{
NSLog(@"没有扫描到数据");
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。