Question

I have a method like this:

- (CGPoint) _convertCGPointCT2UIKit:(CGPoint)ctPoint{
 CGPoint uikitPoint = CGPointMake(ctPoint.x + INITIAL_HORIZ_OFFSET, 
          self.bounds.size.height - ctPoint.y - INITIAL_VERT_OFFSET);
 return uikitPoint;
}

Is there any way I can make this a macro?
I tried this but I get errors like “; expected before )” and so on.

#define CGPointUIKit2CT(p) CGPointMake(p.x - INITIAL_HORIZ_OFFSET, self.bounds.size.height - p.y - INITIAL_VERT_OFFSET);

thanks in advance.

Ignacio

Answer 1

A couple of rules of thumb to guide you:

• Wrap everything in parentheses
• Don’t end a macro with a semicolon, that’s probably what’s generating your errors. Instead put the semicolon in your code when you use it.

Here’s my answer:

 #define CGPointUIKit2CT(p) CGPointMake(((p).x) - INITIAL_HORIZ_OFFSET, self.bounds.size.height - ((p).y) - INITIAL_VERT_OFFSET)