iphone - Add a simple CGGradient to UINavigationBar -

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possible duplicate:
uinavigationbar gradient details

i looked around web haven't found clear example. have no experience cggradient need simple thing: want add gradient navigationbar of navigationcontroller, gradient should linear, top bottom. want start color : (88.0, 38.0, 40.0) , end color (50.0 15.0 16.0). please give me example of how add gradient navigation bar?

thank

adjust color or supply image if want

//                                  #lighter r,g,b,a                    #darker r,g,b,a #define main_color_components       { 0.153, 0.306, 0.553, 1.0, 0.122, 0.247, 0.482, 1.0 } #define light_color_components      { 0.478, 0.573, 0.725, 1.0, 0.216, 0.357, 0.584, 1.0 }  @implementation uinavigationbar (uinavigationbarcategory)  - (void)drawrect:(cgrect)rect {     if (imageready) {         uiimage *img = [uiimage imagenamed: @"navigation_background.png"];         [img drawinrect:cgrectmake(0, 0, self.frame.size.width, self.frame.size.height)];     } else {         // render instead.         // need adjust main_color_components , light_color_components match app         // emulate tint colored bar        cgcontextref context = uigraphicsgetcurrentcontext();        cgfloat locations[2] = { 0.0, 1.0 };        cgcolorspaceref mycolorspace = cgcolorspacecreatedevicergb();         cgfloat topcomponents[8] = light_color_components;        cggradientref topgradient = cggradientcreatewithcolorcomponents(mycolorspace, topcomponents, locations, 2);        cgcontextdrawlineargradient(context, topgradient, cgpointmake(0, 0), cgpointmake(0,self.frame.size.height/2), 0);        cggradientrelease(topgradient);         cgfloat botcomponents[8] = main_color_components;        cggradientref botgradient = cggradientcreatewithcolorcomponents(mycolorspace, botcomponents, locations, 2);        cgcontextdrawlineargradient(context, botgradient,        cgpointmake(0,self.frame.size.height/2), cgpointmake(0, self.frame.size.height), 0);        cggradientrelease(botgradient);         cgcolorspacerelease(mycolorspace);          // top line        cgcontextsetrgbstrokecolor(context, 1, 1, 1, 1.0);        cgcontextmovetopoint(context, 0, 0);        cgcontextaddlinetopoint(context, self.frame.size.width, 0);        cgcontextstrokepath(context);         // bottom line        cgcontextsetrgbstrokecolor(context, 0, 0, 0, 1.0);        cgcontextmovetopoint(context, 0, self.frame.size.height);        cgcontextaddlinetopoint(context, self.frame.size.width, self.frame.size.height);        cgcontextstrokepath(context);     } }

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