iOS native Cifilter Create two-dimensional code

iOS native Cifilter Create two-dimensional code2016-05-31 Future C

iOS native Cifilter Create two-dimensional code

About the two-dimensional code generation, online is also a lot, a long-ago third-party libraries are mostly written by C + +, but also some such as zxing, is also very useful, here is introduced through Cifilter to create two-dimensional code.

Creating the QR code is simple, just passing in a simple string .

-(Ciimage *) createqrforstring: (NSString *) qrstring {nsdata*stringdata =[qrstring datausingencoding:nsutf8stringencoding]; //Create filterCifilter*qrfilter = [Cifilter filterwithname:@"Ciqrcodegenerator"]; //setting content and error correction levels[Qrfilter setvalue:stringdata forkey:@"InputMessage"]; [Qrfilter SetValue:@"M"Forkey:@"Inputcorrectionlevel"]; //back to Ciimage    returnqrfilter.outputimage;}

For 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)); //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:image fromrect:extent];    Cgcontextsetinterpolationquality (Bitmapref, Kcginterpolationnone);    CGCONTEXTSCALECTM (bitmapref, scale, scale);     Cgcontextdrawimage (Bitmapref, extent, bitmapImage); //2. Save Bitmap to Picturecgimageref scaledimage=cgbitmapcontextcreateimage (BITMAPREF);     Cgcontextrelease (BITMAPREF);     Cgimagerelease (BitmapImage); //OriginalUIImage*outputimage =[UIImage Imagewithcgimage:scaledimage];    Uigraphicsbeginimagecontextwithoptions (Outputimage.size, NO, [[UIScreen mainscreen] scale]); [Outputimage Drawinrect:cgrectmake (0,0, size, size)]; //Watermark MapUIImage*waterimage = [UIImage imagenamed:@"icon"]; [Waterimage drawinrect:cgrectmake (Size-waterimagesize)/2.0, (size-waterimagesize)/2.0, Waterimagesize, waterimagesize)]; UIImage*newpic =Uigraphicsgetimagefromcurrentimagecontext ();    Uigraphicsendimagecontext (); returnNewpic;}

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iOS native Cifilter Create two-dimensional code