zoukankan      html  css  js  c++  java
  • ios创建二维码

    #import "LCTwoCodeImage.h"

     

    @implementation LCTwoCodeImage

     

     

    +(UIImage *) GotoCreatMyTwoCode :(NSString *) string {

        //通过传入的字符串来创建二维码初始图层渲染

        CIImage * firstImage = [self creatCIImageFromString:string];

        //通过 CIImage 来生成二维码

        UIImage * qrCode = [self createNonInterpolatedUIImageFormCIImage:firstImage withSize:250.0f];

        

        return qrCode;

    }

     

     

    +(UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {

        CGRect extent = CGRectIntegral(image.extent);

        CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

        // create a bitmap image that we'll draw into a bitmap context at the desired size;

        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:image fromRect:extent];

        CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);

        CGContextScaleCTM(bitmapRef, scale, scale);

        CGContextDrawImage(bitmapRef, extent, bitmapImage);

        // Create an image with the contents of our bitmap

        CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);

        // Cleanup

        CGContextRelease(bitmapRef);

        CGImageRelease(bitmapImage);

        return [UIImage imageWithCGImage:scaledImage];

    }

     

    +(CIImage *)creatCIImageFromString:(NSString *) string {

        NSData * stringData = [string dataUsingEncoding:NSUTF8StringEncoding];

        //添加图层

        CIFilter * qrFiler = [CIFilter filterWithName:@"CIQRCodeGenerator"];

        [qrFiler setValue:stringData forKey:@"inputMessage"];

        [qrFiler setValue:@"M" forKey:@"inputCorrectionLevel"];

        return [qrFiler outputImage];

    }

     

     

     

     

    @end

  • 相关阅读:
    Intellij Idea 创建Web项目入门
    使用swagger作为restful api的doc文档生成
    SpringMVC中的参数绑定总结
    Spring注解@Resource和@Autowired区别对比
    java的(PO,VO,TO,BO,DAO,POJO)解释
    java有几种对象(PO,VO,DAO,BO,POJO)
    clone项目到本地
    修改虚拟机上Linux系统的IP地址
    虚拟机下CentOS 6.5配置IP地址的三种方法
    系统重启
  • 原文地址:https://www.cnblogs.com/supersr/p/4969510.html
Copyright © 2011-2022 走看看