Pie chart with 2 portion set label with center position - iphone

I have problem regarding setting the uilabel in the middle edge in pie chart circle.
In my Pie chart there are 2 portion.
Both portion change dynamically.
How can i get center position in both portion so i can set my label in the center edge of the particular section.
Thank You
Regards,
Keyur Bhalodiya

use carteasian equation.
(x,y) = (rcos#,rsin#).
R is the radius of the piechart. # is the angle at which you need to find a point. In your case middle of your pie slices.

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