Birth to a QR code based on a string chain

#pragma mark-interpolateduiimage= because the generated QR code is a ciimage, we switch directly to UIImage word size is not good control, so use the following method to return the size of the UIImage

-(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];

}

#pragma mark-qrcodegenerator-- First is the generation of two-dimensional code, using cifilter is very simple, directly into the generation of two-dimensional code of the string can be

-(ciimage *) createqrforstring: (nsstring *) qrstring {

//need to convert the string to a UTF-8 encoded NSData object

nsdata *stringdata = [qrstring datausingencoding:nsutf8stringencoding];

//Create the filter

cifilter *qrfilter = [cifilter filterwithname:@ "Ciqrcodegenerator"];

//Set the message content and error-correction level

[Qrfilter setValue: StringData forkey:@ "InputMessage"];

[Qrfilter setValue:@ "M" forkey:@ "Inputcorrectionlevel"];

//Send the image back

return qrfilter. Outputimage;

}

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Call:

UIImage *boundimg = [self createnoninterpolateduiimageformciimage: [ Self Createqrforstring:@ "http://baidu.com"] withsize:250.0f];

Birth to a QR code based on a string chain