“Expression is not assignable” — Problem assigning float as sum of two other floats in Xcode?

Question

In a piano app, I\'m assigning the coordinates of the black keys. Here is the line of code causing the error.

\'blackKey\' and \'whiteKey\' are both customViews

Answer 1

blackKey.center = CGPointMake ( whiteKey.frame.origin.x + whiteKey.frame.size.width, blackKey.center.y);

One way of doing it.