iOS development-Generate two-dimensional code images "with small icons in the middle of the two-dimensional Code" (QRCode)

Generate two-dimensional code picture is also commonly used in the project, two-dimensional code scanning git has a lot of good, here the main next two-dimensional code generation

1. Common QR Code 1.1 method

/**

Generate two-dimensional code

Qrstering: String

Imagefloat: Two-dimensional code image size

*/

+ (UIImage *) createqrcodewithstring: (NSString *) qrstering withimgsize: (cgfloat) imagefloat;

1.2 Method implementation

/**

Generate two-dimensional code

Qrstering: String

Imagefloat: Two-dimensional code image size

*/

+ (UIImage *) createqrcodewithstring: (NSString *) qrstring withimgsize: (cgfloat) imagefloat{

Cifilter *filter = [Cifilter filterwithname:@ "Xiaoguige"];

[Filter SetDefaults];

NSString *getstring = qrstring;

NSData *datastring = [getString datausingencoding:nsutf8stringencoding];

[Filter setvalue:datastring forkey:@ "InputMessage"];

Get image of filter output

Ciimage *outimage = [Filter outputimage];

UIImage *imagev = [self imagewithimagesize:imagefloat withciiimage:outimage];

return QR code image

return Imagev;

}

2. Two-dimensional code 2.1 method with small icon in middle

/**

Generate two-dimensional code (small picture in the middle)

Qrstering: String

CenterImage: Image object in the middle of the QR code

*/

+ (UIImage *) createimgqrcodewithstring: (NSString *) qrstring centerimage: (UIImage *) centerimage;

2.2 Method implementation

/**

Generate two-dimensional code (small picture in the middle)

Qrstering: Required String

CenterImage: Image object in the middle of the QR code

*/

+ (UIImage *) createimgqrcodewithstring: (NSString *) qrstring centerimage: (UIImage *) centerimage{

Creating Filter objects

Cifilter *filter = [Cifilter filterwithname:@ "Xiaoguige"];

Restore the default properties of a filter

[Filter SetDefaults];

Convert a string to NSData

NSData *datastring = [qrstring datausingencoding:nsutf8stringencoding];

Set the input value of the filter, KVC assignment

[Filter setvalue:datastring forkey:@ "InputMessage"];

Get image of filter output

Ciimage *outimage = [Filter outputimage];

Picture is less than (27,27), we need to enlarge

Outimage = [Outimage Imagebyapplyingtransform:cgaffinetransformmakescale (20, 20)];

Turn ciimage type to UIImage type

UIImage *startimage = [UIImage imagewithciimage:outimage];

Open drawing, get graphics context

Uigraphicsbeginimagecontext (startimage.size);

Picture the two-dimensional code image (here is the graphical context, the upper-left corner is (0,0) point

[Startimage drawinrect:cgrectmake (0, 0, StartImage.size.width, startImage.size.height)];

And put the little pictures up

CGFloat Icon_imagew = 200;

CGFloat Icon_imageh = Icon_imagew;

CGFloat Icon_imagex = (startimage.size.width-icon_imagew) * 0.5;

CGFloat icon_imagey = (startimage.size.height-icon_imageh) * 0.5;

[CenterImage Drawinrect:cgrectmake (Icon_imagex, Icon_imagey, Icon_imagew, Icon_imageh)];

Get this picture of the current picture

UIImage *qrimage = Uigraphicsgetimagefromcurrentimagecontext ();

Close the graphics context

Uigraphicsendimagecontext ();

return QR code image

return qrimage;

}

Additional methods

/** convert Ciimage to uiimage and enlarge (internal conversion use) */

+ (UIImage *) Imagewithimagesize: (cgfloat) size withciiimage: (ciimage *) ciiimage{

CGRect extent = Cgrectintegral (ciiimage.extent);

CGFloat scale = MIN (Size/cgrectgetwidth (extent), size/cgrectgetheight (extent));

1. Create bitmap;

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:ciiimage fromrect:extent];

Cgcontextsetinterpolationquality (Bitmapref, Kcginterpolationnone);

CGCONTEXTSCALECTM (bitmapref, scale, scale);

Cgcontextdrawimage (Bitmapref, extent, bitmapImage);

2. Save Bitmap to Picture

Cgimageref scaledimage = Cgbitmapcontextcreateimage (bitmapref);

Cgcontextrelease (BITMAPREF);

Cgimagerelease (BitmapImage);

return [UIImage Imagewithcgimage:scaledimage];

}

iOS development-Generate two-dimensional code images "with small icons in the middle of the two-dimensional Code" (QRCode)