Question

I’m playing around with UIbuttons, just to get a feel on what can really be done with them. I have only one problem so far:

How do I modify the position of a UIButton?

- (IBAction)buttonClicked:(id)sender
{
   UIButton *senderB = sender;

   CGPoint position = senderB.frame.origin;
   CGSize size = senderB.frame.size;
   senderB.frame = CGRectMake(position.x,position.y + 10,size.width,size.height);
}

The above works just fine, however, creating a new CGrect for every time I want to simply change one seems rather inefficient to me.

Is there any way for me to directly set the values of senderB.frame.origin.x, etc?

Answer 1

Nope. Notice that ‘someview.frame’ returns a CGRect by value, not by reference or pointer or whatever. That’s why you get the ‘Lvalue required’ error.

However, setting the frame like you’re doing is plenty fast.