Slow animation action

Question

Im have a nslayoutconstraint and when a user presses a button, the constraint is supposed to slowly reach zero. Currently it just automatically hits zero quickly when a button is pressed. My code isn't working. Here it is.

@IBAction func Expansion(_ sender: AnyObject) {

    UIView.animate(withDuration: 0.1, animations: {

        self.ScrolliewTopConstraint.constant = 0
        self.ScrollView.isScrollEnabled = true

    }, completion: nil)
}

score 3 · Answer 1 · answered Jan 08 '17 at 00:08

3

You need to animate after setting the constant.

// set the constant
UIView.animate(withDuration: 0.1 {
   self.view.layoutIfNeeded()
}

answered Jan 08 '17 at 00:08

Mundi

79,884
17
117
140

i already set the constant – user7222919 Jan 08 '17 at 00:14
Set it before the animation. Then animate `layoutIfNeeded()`. – Mundi Jan 08 '17 at 00:16
i did that didn't work – user7222919 Jan 08 '17 at 00:16
never mind it worked thanks – user7222919 Jan 08 '17 at 00:18

Slow animation action

1 Answers1