iphone - 如何计算 NSButton 的中心？

Question

我不知道如何找到按钮的中心:

spinner = [[EKActivityIndicatorView alloc] initWithFrame:CGRectMake([followButton bounds].origin.x/2, [followButton bounds].origin.y/2, 16, 16)];

划分frame.x和frame.y并不能解决问题

Answer 1

正确的做法是:

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

或者，正确的公式是:

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);