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iOS中生成指定大小、指定颜色的二维码和条形码方法详解

时间：2021-02-27 16:19     来源/作者：jianshu_wl

ios7.0之后可以利用系统原生 api 生成二维码, ios8.0之后可以生成条形码, 系统默认生成的颜色是黑色. 在这里, 利用以下方法可以生成指定大小、指定颜色的二维码和条形码, 还可以添加背景颜色、阴影效果, 以下是具体方法.

一. 生成二维码

avilable in ios 7.0 and later

方法如下:

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#pragma mark - 生成二维码
//avilable in ios 7.0 and later
+ (uiimage *)qrcodeimagewithcontent:(nsstring *)content
           codeimagesize:(cgfloat)size
                logo:(uiimage *)logo
             logoframe:(cgrect)logoframe
                red:(cgfloat)red
               green:(cgfloat)green
                blue:(cgfloat)blue;

具体实现如下:

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#pragma mark - 生成二维码
+ (uiimage *)qrcodeimagewithcontent:(nsstring *)content
           codeimagesize:(cgfloat)size
                logo:(uiimage *)logo
             logoframe:(cgrect)logoframe
                red:(cgfloat)red
               green:(cgfloat)green
                blue:(cgfloat)blue{
 uiimage *image = [self qrcodeimagewithcontent:content codeimagesize:size red:red green:green blue:blue];
  //有 logo 则绘制 logo
  if (logo != nil) {
    uigraphicsbeginimagecontext(image.size);
    [image drawinrect:cgrectmake(0, 0, image.size.width, image.size.height)];
    [logo drawinrect:logoframe];
    uiimage *resultimage = uigraphicsgetimagefromcurrentimagecontext();
    uigraphicsendimagecontext();
    return resultimage;
  }else{
    return image;
  }
}
//改变二维码颜色
+ (uiimage *)qrcodeimagewithcontent:(nsstring *)content codeimagesize:(cgfloat)size red:(cgfloat)red green:(cgfloat)green blue:(cgfloat)blue{
  uiimage *image = [self qrcodeimagewithcontent:content codeimagesize:size];
  int imagewidth = image.size.width;
  int imageheight = image.size.height;
  size_t bytesperrow = imagewidth * 4;
  uint32_t *rgbimagebuf = (uint32_t *)malloc(bytesperrow * imageheight);
  cgcolorspaceref colorspaceref = cgcolorspacecreatedevicergb();
  cgcontextref context = cgbitmapcontextcreate(rgbimagebuf, imagewidth, imageheight, 8, bytesperrow, colorspaceref, kcgbitmapbyteorder32little|kcgimagealphanoneskiplast);
  cgcontextdrawimage(context, cgrectmake(0, 0, imagewidth, imageheight), image.cgimage);
  //遍历像素, 改变像素点颜色
  int pixelnum = imagewidth * imageheight;
  uint32_t *pcurptr = rgbimagebuf;
  for (int i = 0; i<pixelnum; i++, pcurptr++) {
    if ((*pcurptr & 0xffffff00) < 0x99999900) {
      uint8_t* ptr = (uint8_t*)pcurptr;
      ptr[3] = red*255;
      ptr[2] = green*255;
      ptr[1] = blue*255;
    }else{
      uint8_t* ptr = (uint8_t*)pcurptr;
      ptr[0] = 0;
    }
  }
  //取出图片
  cgdataproviderref dataprovider = cgdataprovidercreatewithdata(null, rgbimagebuf, bytesperrow * imageheight, providerreleasedata);
  cgimageref imageref = cgimagecreate(imagewidth, imageheight, 8, 32, bytesperrow, colorspaceref,
kcgimagealphalast | kcgbitmapbyteorder32little, dataprovider,null, true, kcgrenderingintentdefault);
  cgdataproviderrelease(dataprovider);
  uiimage *resultimage = [uiimage imagewithcgimage:imageref];
  cgimagerelease(imageref);
  cgcontextrelease(context);
  cgcolorspacerelease(colorspaceref);
  return resultimage;
}
//改变二维码尺寸大小
+ (uiimage *)qrcodeimagewithcontent:(nsstring *)content codeimagesize:(cgfloat)size{
  ciimage *image = [self qrcodeimagewithcontent:content];
  cgrect integralrect = cgrectintegral(image.extent);
  cgfloat scale = min(size/cgrectgetwidth(integralrect), size/cgrectgetheight(integralrect));
size_t width = cgrectgetwidth(integralrect)*scale;
size_t height = cgrectgetheight(integralrect)*scale;
  cgcolorspaceref colorspaceref = cgcolorspacecreatedevicegray();
  cgcontextref bitmapref = cgbitmapcontextcreate(nil, width, height, 8, 0, colorspaceref, (cgbitmapinfo)kcgimagealphanone);
  cicontext *context = [cicontext contextwithoptions:nil];
  cgimageref bitmapimage = [context createcgimage:image fromrect:integralrect];
  cgcontextsetinterpolationquality(bitmapref, kcginterpolationnone);
  cgcontextscalectm(bitmapref, scale, scale);
  cgcontextdrawimage(bitmapref, integralrect, bitmapimage);
  cgimageref scaledimage = cgbitmapcontextcreateimage(bitmapref);
  cgcontextrelease(bitmapref);
  cgimagerelease(bitmapimage);
  return [uiimage imagewithcgimage:scaledimage];
}
//生成最原始的二维码
+ (ciimage *)qrcodeimagewithcontent:(nsstring *)content{
  cifilter *qrfilter = [cifilter filterwithname:@"ciqrcodegenerator"];
  nsdata *contentdata = [content datausingencoding:nsutf8stringencoding];
  [qrfilter setvalue:contentdata forkey:@"inputmessage"];
  [qrfilter setvalue:@"h" forkey:@"inputcorrectionlevel"];
  ciimage *image = qrfilter.outputimage;
  return image;
}
void providerreleasedata (void *info, const void *data, size_t size){
  free((void*)data);
}

一. 生成条形码

avilable in ios 8.0 and later

方法如下:

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#pragma mark - 生成条形码
//avilable in ios 8.0 and later
+ (uiimage *)barcodeimagewithcontent:(nsstring *)content
            codeimagesize:(cgsize)size
                 red:(cgfloat)red
                green:(cgfloat)green
                blue:(cgfloat)blue;

具体实现如下:

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#pragma mark - 生成条形码
+ (uiimage *)barcodeimagewithcontent:(nsstring *)content codeimagesize:(cgsize)size red:(cgfloat)red green:(cgfloat)green blue:(cgfloat)blue{
  uiimage *image = [self barcodeimagewithcontent:content codeimagesize:size];
  int imagewidth = image.size.width;
  int imageheight = image.size.height;
  size_t bytesperrow = imagewidth * 4;
  uint32_t *rgbimagebuf = (uint32_t *)malloc(bytesperrow * imageheight);
  cgcolorspaceref colorspaceref = cgcolorspacecreatedevicergb();
  cgcontextref context = cgbitmapcontextcreate(rgbimagebuf, imagewidth, imageheight, 8, bytesperrow, colorspaceref, kcgbitmapbyteorder32little|kcgimagealphanoneskiplast);
  cgcontextdrawimage(context, cgrectmake(0, 0, imagewidth, imageheight), image.cgimage);
  //遍历像素, 改变像素点颜色
  int pixelnum = imagewidth * imageheight;
  uint32_t *pcurptr = rgbimagebuf;
  for (int i = 0; i<pixelnum; i++, pcurptr++) {
    if ((*pcurptr & 0xffffff00) < 0x99999900) {
      uint8_t* ptr = (uint8_t*)pcurptr;
      ptr[3] = red*255;
      ptr[2] = green*255;
      ptr[1] = blue*255;
    }else{
      uint8_t* ptr = (uint8_t*)pcurptr;
      ptr[0] = 0;
    }
  }
  //取出图片
  cgdataproviderref dataprovider = cgdataprovidercreatewithdata(null, rgbimagebuf, bytesperrow * imageheight, providerreleasedata);
  cgimageref imageref = cgimagecreate(imagewidth, imageheight, 8, 32, bytesperrow, colorspaceref,
kcgimagealphalast | kcgbitmapbyteorder32little, dataprovider,null, true, kcgrenderingintentdefault);
  cgdataproviderrelease(dataprovider);
  uiimage *resultimage = [uiimage imagewithcgimage:imageref];
  cgimagerelease(imageref);
  cgcontextrelease(context);
  cgcolorspacerelease(colorspaceref);
  return resultimage;
}
//改变条形码尺寸大小
+ (uiimage *)barcodeimagewithcontent:(nsstring *)content codeimagesize:(cgsize)size{
  ciimage *image = [self barcodeimagewithcontent:content];
  cgrect integralrect = cgrectintegral(image.extent);
  cgfloat scale = min(size.width/cgrectgetwidth(integralrect), size.height/cgrectgetheight(integralrect));
  size_t width = cgrectgetwidth(integralrect)*scale;
  size_t height = cgrectgetheight(integralrect)*scale;
  cgcolorspaceref colorspaceref = cgcolorspacecreatedevicegray();
  cgcontextref bitmapref = cgbitmapcontextcreate(nil, width, height, 8, 0, colorspaceref, (cgbitmapinfo)kcgimagealphanone);
  cicontext *context = [cicontext contextwithoptions:nil];
  cgimageref bitmapimage = [context createcgimage:image fromrect:integralrect];
  cgcontextsetinterpolationquality(bitmapref, kcginterpolationnone);
  cgcontextscalectm(bitmapref, scale, scale);
  cgcontextdrawimage(bitmapref, integralrect, bitmapimage);
  cgimageref scaledimage = cgbitmapcontextcreateimage(bitmapref);
  cgcontextrelease(bitmapref);
  cgimagerelease(bitmapimage);
  return [uiimage imagewithcgimage:scaledimage];
}
//生成最原始的条形码
+ (ciimage *)barcodeimagewithcontent:(nsstring *)content{
  cifilter *qrfilter = [cifilter filterwithname:@"cicode128barcodegenerator"];
  nsdata *contentdata = [content datausingencoding:nsutf8stringencoding];
  [qrfilter setvalue:contentdata forkey:@"inputmessage"];
    [qrfilter setvalue:@(0.00) forkey:@"inputquietspace"];
  ciimage *image = qrfilter.outputimage;
  return image;
}
void providerreleasedata (void *info, const void *data, size_t size){
  free((void*)data);
}

三.测试

主要代码如下:

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//-----------------------------------二维码、条形码测试--------------------------------------------------
  //条形码
  uiimage *barimage = [utilities barcodeimagewithcontent:@"123456"
codeimagesize:cgsizemake(300, 90)
red:0                        green:0.4
blue:0.6];
cgrect barimageview_frame = cgrectmake(self.view.bounds.size.width/2-300/2, 100, 300, 90);
  uiimageview *barimageview = [[uiimageview alloc] initwithframe:barimageview_frame];
  barimageview.image = barimage;
  barimageview.backgroundcolor = [uicolor clearcolor];
  //阴影
  barimageview.layer.shadowoffset = cgsizemake(-0.5, 0.5);
  barimageview.layer.shadowradius = 0.5;
  barimageview.layer.shadowcolor = [uicolor blackcolor].cgcolor;
  barimageview.layer.shadowopacity = 0.2;
[self.view addsubview:barimageview];
//二维码
  uiimage *qrcodeimage = [utilities qrcodeimagewithcontent:@"how are you?"
codeimagesize:200
logo:[uiimage imagenamed:@"logo.png"]
logoframe:cgrectmake(75, 75, 50, 50)
red:0.0f
green:139/255.0f
blue:139/255.0f];
cgrect qrcodeimageview_frame = cgrectmake(self.view.bounds.size.width/2-200/2, cgrectgetmaxy(barimageview.frame)+20, 200, 200);
  uiimageview *qrcodeimageview = [[uiimageview alloc] initwithframe:qrcodeimageview_frame];
  qrcodeimageview.image = qrcodeimage;
  qrcodeimageview.backgroundcolor = [utilities colorwithhexstring:@"#fdf5e6"];// #006400
  //阴影
  qrcodeimageview.layer.shadowoffset = cgsizemake(0, 0);
  qrcodeimageview.layer.shadowradius = 5;
  qrcodeimageview.layer.shadowcolor = [uicolor blackcolor].cgcolor;
  qrcodeimageview.layer.shadowopacity = 0.4;
  [self.view addsubview:qrcodeimageview];

运行结果如下:

iOS中生成指定大小、指定颜色的二维码和条形码方法详解

运行结果

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持服务器之家！

原文链接：http://www.jianshu.com/p/b893690b472e

标签：
iOS 二维码 条形码 

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