Centering a button in UIScrollView

Question

For the life of me, I can't figure out how to center a UIButton in UIScrollView...

let sv = UIScrollView(frame: CGRect(x: 0, y: 0, width: 300, height: 600))
let b = UIButton(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
sv.addSubview(b)
b.center = sv.center

No matter what I do, the button seems to be off center. This logic works in normal UIView. Why doesn't it with UIScrollView?

why don't you just put it in the center of UIView? it will always be in the center. — Mina, Jun 13 '17 at 04:49
The thing is I'd need the button's y position to be after all the content in the scroll view, but still centered in the middle. — 7ball, Jun 13 '17 at 05:01

score 0 · Answer 1 · answered Jun 13 '17 at 04:53

you can also use

let b = UIButton(frame: CGRect(x: sv.frame.size.width/2 -15, y: sv.frame.size.height/2 -15, width: 30, height: 30))

for your code first check value of sv.center, if it is OK and your UI is not updating then call layoutIfneeded

Reference : How is layoutIfNeeded used?

Centering a button in UIScrollView

1 Answers1