UIImageView doesn't animate when using Auto Layout

Question

My image has the following constraints:

leading = 0
trailing = 0
top = 75
height = 250

I want my image to start from the right side of the screen and move to initial place where the constraints are set.

Here is my code:

imageLeadingConstraint.constant = 100
imageTrailingConstraint.constant = -100
imageTopConstraint.constant = 100
image.layoutIfNeeded()

UIView.animate(withDuration: 1.0) {
    self.imageLeadingConstraint.constant = 0
    self.imageTrailingConstraint.constant = 0
    self.imageTopConstraint.constant = 75
    self.image.layoutIfNeeded()
}

The issue is that the image is moving to initial place, but not using an animation.
Is my code right ? How come the image just appears in the new position and not animating ?

Peter Hornsby · Accepted Answer · 2016-11-08 11:27:37Z

3

You should call layoutIfNeeded for imageView's superview.

self.image.superview.layoutIfNeeded()

edited Nov 8, 2016 at 11:27

Peter Hornsby

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answered Nov 6, 2016 at 13:17

Nikita Ermolenko

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1 Comment

Peter Hornsby Over a year ago

The user has tagged this question as swift based, your answer was in objective-C.

Nikita Patskov · Accepted Answer · 2016-11-06 13:16:58Z

0

I'm not sure that I understood you, but: 1) Change constraints (second time) outside of animation block. 2) use self.image.superview?.layoutIfNeeded() instead

answered Nov 6, 2016 at 13:16

Nikita Patskov

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