从github下载的qrencode没有QRCodeGenerator文件,需要引入

//
// QR Code Generator - generates UIImage from NSString
//
// Copyright (C) 2012 http://moqod.com Andrew Kopanev <andrew@moqod.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface QRCodeGenerator : NSObject

+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size;

@end
//
// QR Code Generator - generates UIImage from NSString
//
// Copyright (C) 2012 http://moqod.com Andrew Kopanev <andrew@moqod.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//

#import "QRCodeGenerator.h"
#import "qrencode.h"

enum {
    qr_margin =
};

@implementation QRCodeGenerator

+ (void)drawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size {
    unsigned ;
    int width;
    data = code->data;
    width = code->width;
    float zoom = (double)size / (code->width + 2.0 * qr_margin);
    CGRect rectDraw = CGRectMake(, , zoom, zoom);

    // draw
    CGContextSetFillColor(ctx, CGColorGetComponents([UIColor blackColor].CGColor));
    ; i < width; ++i) {
        ; j < width; ++j) {
            ) {
                rectDraw.origin = CGPointMake((j + qr_margin) * zoom,(i + qr_margin) * zoom);
                CGContextAddRect(ctx, rectDraw);
            }
            ++data;
        }
    }
    CGContextFillPath(ctx);
}

+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size {
    if (![string length]) {
        return nil;
    }

    QRcode *code = QRcode_encodeString([, QR_ECLEVEL_L, QR_MODE_8, );
    if (!code) {
        return nil;
    }

    // create context
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef ctx = CGBitmapContextCreate(, size, size, , size * , colorSpace, kCGImageAlphaPremultipliedLast);

    CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(, -size);
    CGAffineTransform scaleTransform = CGAffineTransformMakeScale(, -);
    CGContextConcatCTM(ctx, CGAffineTransformConcat(translateTransform, scaleTransform));

    // draw QR on this context
    [QRCodeGenerator drawQRCode:code context:ctx size:size];

    // get image
    CGImageRef qrCGImage = CGBitmapContextCreateImage(ctx);
    UIImage * qrImage = [UIImage imageWithCGImage:qrCGImage];

    // some releases
    CGContextRelease(ctx);
    CGImageRelease(qrCGImage);
    CGColorSpaceRelease(colorSpace);
    QRcode_free(code);

    return qrImage;
}

@end

在需要的文件中加入#import "QRCodeGenerator.h"即可

//
//  ViewController.m
//  qRenCode
//
//  Created by City--Online on 15/6/9.
//  Copyright (c) 2015年 CYW. All rights reserved.
//

#import "ViewController.h"
#import "QRCodeGenerator.h"
@interface ViewController ()
@property(nonatomic,strong) UITextField *textField;
@property(nonatomic,strong) UIButton *btn;
@property(nonatomic,strong) UIImageView *imgView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    _textField=[[UITextField alloc]initWithFrame:CGRectMake(, , , )];
    _textField.borderStyle=UITextBorderStyleLine;
    [self.view addSubview:_textField];

    _btn=[UIButton buttonWithType:UIButtonTypeSystem];
    [_btn setTitle:@"生成" forState:UIControlStateNormal];
    [_btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    _btn.frame=CGRectMake(, , , );
    [_btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_btn];

    _imgView=[[UIImageView alloc]initWithFrame:CGRectMake(, , , )];
//    _imgView.backgroundColor=[UIColor blackColor];
    [self.view addSubview:_imgView];
}
-(void)btnClick:(id)sender
{
    _imgView.image = [QRCodeGenerator qrImageForString:_textField.text imageSize:_imgView.bounds.size.width];

}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [_textField resignFirstResponder];
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

有时候想在二维码中间带个Logo,犹豫二维码有容错率,所以可以直接将图片添加上去

-(void)btnClick:(id)sender
{
    _imgView.image = [QRCodeGenerator qrImageForString:_textField.text imageSize:_imgView.bounds.size.width];
    UIImageView *img=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"1.jpg"]];
    img.frame=CGRectMake(_imgView.bounds.size.width*/, _imgView.bounds.size.height*/, _imgView.bounds.size.width/, _imgView.bounds.size.height/);
    img.backgroundColor=[UIColor redColor];
    [_imgView addSubview:img];

}

二维码之qrencode生成(带logo)的更多相关文章

  1. 生成二维码、条形码、带logo的二维码

    Nuget安装ZXing.Net,帮助类: using System; using System.Collections.Generic; using System.Drawing; using Sy ...

  2. C# 生成二维码并且在中间加Logo

    今天做项目的时候有个在生成二维码并且在中间加入Logo的需求,动手试了几把,总感觉效果没有之前写的好,就翻出旧代码,果然还是熟悉的味道,生成一张效果图如下 左边是微信里面的,右边是我自己生成的 原理比 ...

  3. QRCode生成二维码,jq QRCode生成二维码,QRCode生成电子名片

    [QRCode官网]http://phpqrcode.sourceforge.net/ PHP QRCode生成二维码 官网下载QRCode源码包,引入源码包中的 qrlib.php . <?p ...

  4. iOS开发技术 - 二维码扫描、生成

    QRecLevel:QR_ECLEVEL_H // 二维码容错率,最高为30%(即QR_ECLEVEL_H),即LOGO有大                                       ...

  5. 二维码(QR Code)生成与解析

    二维码(QR Code)生成与解析 写在前面 经常在大街上听到扫码送什么什么,如果真闲着没事,从头扫到位,估计书包都装满了各种东西.各种扫各种送,太泛滥了.项目中从没接触过二维码的东东,最近要使用,就 ...

  6. Android二维码扫描、生成

    Android二维码扫描.生成 现在使用二维码作为信息的载体已经越来越普及,那么二维码的生成以及扫描是如何实现的呢 google为我们提供了zxing开源库供我们使用 zxing GitHub源码地址 ...

  7. iOS 原生二维码扫描和生成

    代码地址如下:http://www.demodashi.com/demo/12551.html 一.效果预览: 功能描述:WSLNativeScanTool是在利用原生API的条件下封装的二维码扫描工 ...

  8. 二维码相关---java生成二维码名片,而且自己主动保存到手机通讯录中...

    版权声明:本文为博主原创文章,未经博主credreamer 同意不得转载 违者追究法律责任. https://blog.csdn.net/lidew521/article/details/244418 ...

  9. java生成带logo的二维码,自定义大小,logo路径取服务器端

    package com.qishunet.eaehweb.util; import java.awt.BasicStroke; import java.awt.Graphics; import jav ...

随机推荐

  1. DBCC--CHECKDB--不可被替代的原因

    CHECKSUM不能发现的两类问题 1. 发生在内存中的页错误,如内存损坏+第三方程序修改等 2. MS SQL Server潜在BUG导致的逻辑错误,该类错误可以使用重建索引或重建约束来修复 CHE ...

  2. 拒绝“高冷”词汇!初学C#中的委托

    有一天,你写了好多好多带“形参”的构造函数(就是“方法”,同义),而且需要向这些构造函数里传递同样的“实参”,然后你就憨憨地一个一个函数的调用并赋予同样的“实参”,这一天就这么过去了... 又过了几天 ...

  3. 用.net开发音频编辑软件

    智能语音机器人软件免不了需要对语音流进行处理,主要包括语音的播放.录制.读取.保存.图形化展示和剪辑等功能.这方面专业的软件有Adobe Audition,为了方便用户使用,我用.net实现了上述功能 ...

  4. log4net 未生成log 原因分析

    本文假定你对log4net的配置以及在代码中的使用都非常熟悉,但就是没有按预想的生成log文件,正当你抓耳挠腮之时,那以下原因很可能是你解决问题的办法: 1.log4net.dll是否生成到程序运行目 ...

  5. Python常用第三方模块(长期更新)

    1.keyboard #监控键盘 2.PIL#处理图片 3.operator #操作列表 4.shelve #数据存储方案 保存dat文件 5.optparse #处理命令行参数 6.configpa ...

  6. “全栈2019”Java多线程第二十六章:同步方法生产者与消费者线程

    难度 初级 学习时间 10分钟 适合人群 零基础 开发语言 Java 开发环境 JDK v11 IntelliJ IDEA v2018.3 文章原文链接 "全栈2019"Java多 ...

  7. “全栈2019”Java多线程第二十二章:饥饿线程(Starvation)详解

    难度 初级 学习时间 10分钟 适合人群 零基础 开发语言 Java 开发环境 JDK v11 IntelliJ IDEA v2018.3 文章原文链接 "全栈2019"Java多 ...

  8. 蒲公英(bzoj2724)(分块+区间众数)

    Input Output Sample Input 6 3 1 2 3 2 1 2 1 5 3 6 1 5 Sample Output 1 2 1 HINT \(n <= 40000\),$ m ...

  9. 关于finecms v5 会员头像 任意文件上传漏洞分析

    看到我私藏的一个洞被别人提交到补天拿奖金,所以我干脆在社区这里分享,给大家学习下 本文原创作者:常威,本文属i春秋原创奖励计划,未经许可禁止转载! 1.定位功能 下载源码在本地搭建起来后,正常登陆了用 ...

  10. pythonweb框架Flask学习笔记02-一个简单的小程序

    #-*- coding:utf-8 -*- #导入了Flask类 这个类的实例将会是我们的WSGI应用程序 from flask import Flask #创建一个Flask类的实例 第一个参数是应 ...