How can I calculate the center of an NSButton?

I'm not sure how to find the center of my button:

spinner = [[EKActivityIndicatorView alloc] initWithFrame:CGRectMake([followButton bounds].origin.x/2, [followButton bounds].ori开发者_开发问答gin.y/2, 16, 16)];

Dividing the frame.x and frame.y does not do the trick

The correct way is to do:

CGRectMake(CGRectGetMidX([followButton frame]), CGRectGetMidY([followButton frame]), 16, 16)

Alternatively, the correct formula is:

CGRect frame;
CGPoint center;
frame = [view frame];
center.x = frame.origin.x + (frame.size.width / 2);
center.y = frame.origin.y + (frame.size.height / 2);

What you want to do is:

CGRectMake(NSMidX([followButton frame], NSMidY([followButton frame]), 16, 16)

Using the bounds will return (0,0) for the origin, only taking into account the size of the button. Using the frame will provide the origin as well.

Edit: sorry, my code is a bastardized cocoa/core graphics hybrid.