iphone - UIImageView filter image into solid color -

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i have colored icons transparent backgrounds. automatically able show flat versions of (solid color gray) depending on state of program.

could core image filters? there way?

i think i've did same thing before, have colored icon, needs keep shape , change color mono color. write extension uiimage.

here code, hope you.

uiimage+monoimage.h

// //  uiimage+monoimage.h //  shiftscheduler // //  created zhang jiejing on 12-2-11. //  copyright (c) 2012. rights reserved. //  #import <uikit/uikit.h>  @interface uiimage (monoimage)  // function create image context , draw image mask // clip context mask // fill color user choosed. // can create image shape specify color icon. + (uiimage *) generatemonoimage: (uiimage *)icon withcolor:(uicolor *)color; @end

uiimage+monoimage.m

// //  uiimage+monoimage.m //  shiftscheduler // //  created jiejing zhang on 12-2-11. //  copyright (c) 2012. rights reserved. //  #import "uiimage+monoimage.h"  @implementation uiimage (monoimage)  + (uiimage *) generatemonoimage: (uiimage *)icon withcolor:(uicolor *)color {     uiimage *finishimage;     cgimageref alphaimage = cgimageretain(icon.cgimage);     cgcolorref colorref = cgcolorretain(color.cgcolor);      uigraphicsbeginimagecontext(icon.size);     cgcontextref ctx = uigraphicsgetcurrentcontext();      cgrect imagearea = cgrectmake (0, 0,                                    icon.size.width, icon.size.height);      // don't know why if don't translate ctm, image *bottom*     // aka, head on bottom shape, need use tranlatectm , scalectm let     // y-axis rotated.     cgfloat height = icon.size.height;     cgcontexttranslatectm(ctx, 0.0, height);     cgcontextscalectm(ctx, 1.0, -1.0);      cgcontextcliptomask(ctx, imagearea , alphaimage);      cgcontextsetfillcolorwithcolor(ctx, colorref);     cgcontextfillrect(ctx, imagearea);     cgimagerelease(alphaimage);     cgcolorrelease(colorref);      finishimage = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();     return finishimage; }   @end

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