ios - CAAnimation with a CGPath using arrays of values -

i have uiview shapes drawn path, inside loop using values array radius , stroke width. blends important, switch colours (ignore rgb macro).

what want animate oldshaperadius values newshaperadius affecting radius of arc , strokewidth of strokedarc.

now have looked @ lot of examples of core animation, can't see how affect drawing of effects have below, , how work calayers?

//my uiview #import "quartzcore/calayer.h" #define degreestoradians( degrees ) ( ( degrees ) / 180.0 * m_pi )  - (id)initwithframe:(cgrect)frame {     self = [super initwithframe:frame];      if (self) {         self.strokewidth=38.0f;         self.radius=47.0f;         oldshaperadius=[[nsmutablearray alloc] initwithobjects:[nsnumber numberwithfloat:1], [nsnumber numberwithfloat:1], [nsnumber numberwithfloat:1.0], [nsnumber numberwithfloat:1], nil];         newshaperadius=[[nsmutablearray alloc] initwithobjects:[nsnumber numberwithfloat:0.6], [nsnumber numberwithfloat:0.9], [nsnumber numberwithfloat:1.0], [nsnumber numberwithfloat:0.5], nil];     } }  - (void)drawrect:(cgrect)rect {        (int i=0; i<4; i++) {         uicolor *shapecolor;          switch (i) {             case 0:                 shapecolor=uicolorfromrgb(category_color_blue);                 break;             case 1:                 shapecolor=uicolorfromrgb(category_color_green);                 break;             case 2:                 shapecolor=uicolorfromrgb(category_color_pink);                 break;             case 3:                 shapecolor=uicolorfromrgb(category_color_yellow);                 break;             default:                 break;         }          cgmutablepathref arc = cgpathcreatemutable();          cgpathaddarc(arc, null, 160.0f,85, radius*[[oldshaperadius objectatindex:i] floatvalue], degreestoradians(90*i), degreestoradians(90*(i+1)), no);         cgpathref strokedarc =cgpathcreatecopybystrokingpath(arc, null, strokewidth*[[oldshaperadius objectatindex:i] floatvalue], kcglinecapround,kcglinejoinround,0.0f);          context = uigraphicsgetcurrentcontext();         cgcontextsetblendmode(context, kcgblendmodemultiply);         cgcontextaddpath(context, strokedarc);         cgcontextsetfillcolorwithcolor(context, shapecolor.cgcolor);          cgcontextdrawpath(context, kcgpathfill);     } } 

oh lords of stackoverflow may have please. high lord david rönnqvist around haha. many in advance.