Sending nil to CGPoint type parameter

Question

Suppose I have this method:

- (void)placeView:(UIView*)theView withCenterIn:(CGPoint)centerPoint;

So I pass the view and a point to te the

Answer 1

CGPoint is a C struct, you cannot pass nil for it. You can create a separate method that does not take the unnecessary CGPoint, and get rid of your if statement, like this:

- (void)placeView:(UIView*)theView withCenterIn:(CGPoint)centerPoint{
    //set that view to the specified point
}

- (void)placeView:(UIView*)theView {
    //set a random center point
}

If you insist on keeping one method, you could designate one point as "special" (say, CGMakePoint(CGFLOAT_MAX, CGFLOAT_MAX)), wrap it in a #define, and use instead of nil.

Yet another solution would be to wrap your CGPoint in NSValue:

NSValue *v = [NSValue withPoint:CGMakePoint(12, 34)];
CGPoint p = [v pointValue];