二维码之qrencode生成(带logo)

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 <[email protected]>

//

// 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 <[email protected]>

//

// 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 = 3

};



@implementation QRCodeGenerator



+ (void)drawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size {

    unsigned char *data = 0;

    int width;

    data = code->data;

    width = code->width;

    float zoom = (double)size / (code->width + 2.0 * qr_margin);

    CGRect rectDraw = CGRectMake(0, 0, zoom, zoom);

    

    // draw

    CGContextSetFillColor(ctx, CGColorGetComponents([UIColor blackColor].CGColor));

    for(int i = 0; i < width; ++i) {

        for(int j = 0; j < width; ++j) {

            if(*data & 1) {

                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([string UTF8String], 0, QR_ECLEVEL_L, QR_MODE_8, 1);

    if (!code) {

        return nil;

    }

    

    // create context

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef ctx = CGBitmapContextCreate(0, size, size, 8, size * 4, colorSpace, kCGImageAlphaPremultipliedLast);

    

    CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -size);

    CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1, -1);

    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(10, 100, 300, 40)];

    _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(20, 150, 100, 40);

    [_btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:_btn];

    

    _imgView=[[UIImageView alloc]initWithFrame:CGRectMake(20, 200, 250, 250)];

//    _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*3/7, _imgView.bounds.size.height*3/7, _imgView.bounds.size.width/7, _imgView.bounds.size.height/7);

    img.backgroundColor=[UIColor redColor];

    [_imgView addSubview:img];



}