//二維碼生成//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:outputImagefromRect:[outputImage extent]];UIImage *image = [UIImage imageWithCGImage:cgImagescale:1.orientation:UIImageOrientationUp];NSLog(@"image QRCode : %@",NSStringFromCGSize(image.size));// Resize without interpolatingUIImage *resized = [self resizeImage:imagewithQuality:kCGInterpolationNonerate: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);

　　由于生成的二維碼和圖片非常小，所以使用方法放大了5倍

//Resize image- (UIImage *)resizeImage:(UIImage *)imagewithQuality:(CGInterpolationQuality)qualityrate:(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; }

　　生成的結果：

? ? ? ? ??

總結

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