iOS 7 二维码的生成

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//二维码生成   //UIImageView *theImageView = [[UIImageView alloc]init]; //[self.view addSubview:theImageView];   CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; [filter setDefaults]; NSData *data = [@"hello worold!" dataUsingEncoding:NSUTF8StringEncoding]; [filter setValue:data forKey:@"inputMessage"];   CIImage *outputImage = [filter outputImage];   CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef cgImage = [context createCGImage:outputImage                                    fromRect:[outputImage extent]];   UIImage *image = [UIImage imageWithCGImage:cgImage                                      scale:1.                                orientation:UIImageOrientationUp];   NSLog(@"image QRCode : %@",NSStringFromCGSize(image.size)); // Resize without interpolating UIImage *resized = [self resizeImage:image                          withQuality:kCGInterpolationNone                                 rate:5.0];   NSLog(@"%@",NSStringFromCGSize(resized.size));   UIImageView *theImageView =[[UIImageView alloc]initWithImage:resized]; theImageView.frame = CGRectMake(100, 200, 100, 100); [self.view addSubview:theImageView];   CGImageRelease(cgImage);

　　由于生成的二维码和图片非常小，所以使用方法放大了5倍

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//Resize image   - (UIImage *)resizeImage:(UIImage *)image              withQuality:(CGInterpolationQuality)quality                     rate:(CGFloat)rate {     UIImage *resized = nil;     CGFloat width = image.size.width * rate;     CGFloat height = image.size.height * rate;           UIGraphicsBeginImageContext(CGSizeMake(width, height));     CGContextRef context = UIGraphicsGetCurrentContext();     CGContextSetInterpolationQuality(context, quality);     [image drawInRect:CGRectMake(0, 0, width, height)];     resized = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();           return resized; }

　　生成的结果：