swift 4 - why doesn't UIButton move when told to?

Question

Why wouldn't a UIButton move when I call:

myButton.frame.origin.x = 100

I am calling it from within the viewDidLayoutSubviews() function, the function is called because an annotation is created on a map, though the button is in a view which isn't really related to the map.

maybe this will help you https://stackoverflow.com/questions/40737164/whats-exactly-viewdidlayoutsubviews — A.Munzer, Jul 15 '18 at 08:28
You don't move UIButton.frame but an instance of UIButton class, — Iraniya Naynesh, Jul 15 '18 at 08:39
Maybe it has moved, but you just don't realise it because it moves before you render the screen — George, Jul 15 '18 at 09:01
Are you using autolayout? If so, any change to the frame will be overridden when autolayout computes the layout. You need to modify the constraints. — Paulw11, Jul 15 '18 at 10:17

score 0 · Answer 1 · answered Jul 16 '18 at 14:19

viewDidLayoutSubviews() Called to notify the view controller that its view has just laid out its subviews.

So this is our chance to make changes to view after it has laid out it's subviews, but before it is visible on screen.

Any changes that depending on bounds has to be done, we can do here and not in ViewDidLoad or ViewWillAppear.

What's exactly viewDidLayoutSubviews?

swift 4 - why doesn't UIButton move when told to?

1 Answers1