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;
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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);
}
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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;
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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);
}
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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];
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运行结果如下:
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快网idc！
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