先在控制器里面创建一个UIimageView来充当二维码的容器
CGFloatqrImageViewWH =SP(190);
CGFloatqrImageViewX =0.5*(SCREEN_WIDTH- qrImageViewWH);
UIImageView* qrImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(qrImageViewX, iconImageView.bottom+SP(35), qrImageViewWH, qrImageViewWH)];
qrImageView.backgroundColor= [UIColorrandomColor];
[self.viewaddSubview:qrImageView];
self.qrImageView= qrImageView;//在此记得设置为成员变量
然后调用生成二维码的方法
#pragma mark - creatQR
- (void)creatQR
{
//创建过滤器
CIFilter* filter = [CIFilterfilterWithName:@"CIQRCodeGenerator"];
//恢复默认
[filtersetDefaults];
//给过滤器添加数据http://www.txship.com/
NSString* dataStr =@"http://www.txship.com";
NSData* data = [dataStrdataUsingEncoding:NSUTF8StringEncodingallowLossyConversion:YES];
//通过KVO设置滤镜inputMessage数据
[filtersetValue:dataforKey:@"inputMessage"];
//获取输出的二维码
CIImage* qrImage = [filteroutputImage];
//将CIImage装换为UIimage并放大显示
self.qrImageView.image= [self createNonInterpolatedUIImageFormCIImage:qrImage withSize:SP(190)];
}
这样就可以生成一个二维码了，但是这样生成的二维码不清晰
可以调用下面方法来还原二维码的清晰度，把输出的二维码传到这个方法中，同时设置二维码的尺寸 你会得到一个全新的 UIimage 再复制给全局变量装二维码的容器中
/**
*根据CIImage生成指定大小的UIImage
*
*@param image CIImage
*@param size图片宽度
*/
- (UIImage*)createNonInterpolatedUIImageFormCIImage:(CIImage*)image withSize:(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];
}
截图功能
传进入你想要截图的view 然后会返回给你一个UIImage对象
#pragma mark -截图功能
-(UIImage*)captureImageFromView:(UIView*)view
{
CGRectscreenRect = [viewbounds];
UIGraphicsBeginImageContext(screenRect.size);
CGContextRefctx =UIGraphicsGetCurrentContext();
[view.layerrenderInContext:ctx];
UIImage* image =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnimage;
}
/**
* 根据CIImage生成指定大小的UIImage
*
* @param image CIImage
* @param size 图片宽度
*/- (UIImage*)createNonInterpolatedUIImageFormCIImage:(CIImage*)image withSize:(CGFloat) size{CGRectextent =CGRectIntegral(image.extent);CGFloatscale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));// 1.创建bitmap;size_t width =CGRectGetWidth(extent) * scale; size_t height =CGRectGetHeight(extent) * scale;CGColorSpaceRefcs =CGColorSpaceCreateDeviceGray();CGContextRefbitmapRef =CGBitmapContextCreate(nil, width, height,8,0, cs, (CGBitmapInfo)kCGImageAlphaNone);CIContext*context = [CIContextcontextWithOptions:nil];CGImageRefbitmapImage = [context createCGImage:image fromRect: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:device error:nil]; [session addInput: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]; [output setMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()]; [session addOutput:output];// 3.1.设置输入元数据的类型(类型是二维码数据)[output setMetadataObjectTypes:@[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[session startRunning];
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*)captureOutput didOutputMetadataObjects:(NSArray*)metadataObjects fromConnection:(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 = [metadataObjects lastObject];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"); }}
