objective c - iPhone - Help with CGGradientCreateWithColorComponents and creating gradient as per screenshot -

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i trying apply same gradient per screen shot below using cggradientcreatewithcolorcomponents.

this i'm using @ moment, it's not quite right , i'm after better way of trying guess these values. i'd know how determine these values code grabbed tutorial, didn't explain @ in terms of components are.

cgcolorspaceref mycolorspace = cgcolorspacecreatedevicergb(); cgfloat components[8] = { 1, 1, 1, 1, 0.866, 0.866, 0.866, 1 }; cgfloat locations[2] = { 0.0, 1.0 };  cggradientref mygradient = cggradientcreatewithcolorcomponents(mycolorspace, components, locations, 2);

enter image description here

i've played around , got picture:

enter image description here

with colors:

static const cgfloat colors [] = {  0.894, 0.894, 0.894, 1.0,  0.694, 0.694, 0.694, 1.0 };

using piece of code:

- (void) drawrect:(cgrect)rect {    cgcolorspaceref basespace = cgcolorspacecreatedevicergb();    cggradientref gradient = cggradientcreatewithcolorcomponents(basespace, colors, null, 2);    cgcolorspacerelease(basespace), basespace = null;     cgcontextref context = uigraphicsgetcurrentcontext();    cgcontextclearrect(context, rect);    cgcontextsavegstate(context);     cgpoint startpoint = cgpointmake(cgrectgetmidx(rect), cgrectgetminy(rect));    cgpoint endpoint = cgpointmake(cgrectgetmidx(rect), cgrectgetmaxy(rect));     cgcontextclip(context);    cgcontextdrawlineargradient(context, gradient, startpoint, endpoint, 0);     cggradientrelease(gradient), gradient = null;     cgcontextrestoregstate(context);    [super drawrect:rect];  }

i dont know if it's close enough.


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