生成二维码-Apple 原生

最新推荐文章于 2026-01-04 15:51:21 发布

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#二维码

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本文介绍如何使用Objective-C通过NSString分类生成二维码，并利用UIImage分类为二维码图片添加中间图标。

1.NSString的分类
生成纯的二维码：

#import "NSString+Extension.h"
#import <CoreImage/CoreImage.h>
@implementation NSString (Extension)

-(UIImage *)createRRcodeWithSize:(CGFloat)size
{
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    [filter setDefaults];
    NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
    [filter setValue:data forKey:@"inputMessage"];
    CIImage *outputImage = [filter outputImage];


    CGRect extent = CGRectIntegral(outputImage.extent);
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

    size_t width = CGRectGetWidth(extent) * scale;
    size_t height = CGRectGetHeight(extent) * scale;
    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
    CIContext *context = [CIContext contextWithOptions:nil];
    CGImageRef bitmapImage = [context createCGImage:outputImage fromRect:extent];
    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
    CGContextScaleCTM(bitmapRef, scale, scale);
    CGContextDrawImage(bitmapRef, extent, bitmapImage);


    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
    CGContextRelease(bitmapRef);
    CGImageRelease(bitmapImage);
    return [UIImage imageWithCGImage:scaledImage];
}

@end

UIImage的分类，对生成的二维码进行处理（添加中间icon）

#import "UIImage+Operatioin.h"

@implementation UIImage (Operatioin)

+(UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withIconSize:(CGSize)iconSize {
    UIGraphicsBeginImageContext(image.size);


    CGFloat widthOfImage = image.size.width;
    CGFloat heightOfImage = image.size.height;
    CGFloat widthOfIcon = iconSize.width;
    CGFloat heightOfIcon = iconSize.height;

    [image drawInRect:CGRectMake(0, 0, widthOfImage, heightOfImage)];
    [icon drawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,
                                widthOfIcon, heightOfIcon)];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();
    return img;
}

@end