changing property contentsGravity in transform-only layer, will have no effect
It could happen because you changed the Mode attribute of the StackView:
I got this warning when I set Mode to Aspect Fit.
Any layer change on a UIStackView
will result in this warning. As the warning points out UIStackView
is a transform-only layer and it differs quite slightly from a UIView
. As per documentation:
The UIStackView is a nonrendering subclass of UIView; that is, it does not provide any user interface of its own. Instead, it just manages the position and size of its arranged views. As a result, some properties (like backgroundColor) have no effect on the stack view. Similarly, you cannot override layerClass, drawRect:, or drawLayer:inContext:.
It may not point to the exact source of the OP's issue but hopefully, it will shed some light on why UIStackView
behaviour is not the same and should not be confused with UIView
.