How often is layoutSubviews called?
How often is layoutSubviews called?
layoutSubviews is called when the view is created, but never again. My subviews are correctly laid out. If I toggle the in-call status bar off, the subview’s layoutSubviews is not called at all, even though the main view does animate its resize.
What is super layoutSubviews?
The layoutSubviews method Its role is to give to each view its right size and position. It is in this method that the equations defined by our constraints are solved.
When should I call updateConstraints?
Sounds simple enough: whenever you need to change your layout, invalidate it. Then wait for the system to call updateConstraints() in the next layout pass, which is your chance to make the necessary changes to your layout constraints.
Should I call layoutIfNeeded?
You should not call this method directly. If you want to force a layout update, call the setNeedsLayout() method instead to do so prior to the next drawing update. If you want to update the layout of your views immediately, call the layoutIfNeeded() method.
Should we call super layoutSubviews?
You always have to call [super layoutSubviews] last, if the intrinsic content size of a view will be changed. If you change the title of the button, the intrinsic content size of the UIButton will be changed, therefore the last call.
Does layoutIfNeeded call layoutSubviews?
layoutIfNeeded is another method on UIView that will trigger a layoutSubviews call in the future. Instead of queueing layoutSubviews to run on the next update cycle, however, the system will call layoutSubviews immediately if the view needs a layout update.
What is Autoresizingmask?
An integer bit mask that determines how the receiver resizes itself when its superview’s bounds change.
How do I use updateConstraints?
To schedule a change, call setNeedsUpdateConstraints() on the view. The system then calls your implementation of updateConstraints() before the layout occurs. This lets you verify that all necessary constraints for your content are in place at a time when your custom view’s properties are not changing.
How do I contact layoutSubviews?
- this method seems to work better than just calling self.view.layoutSubviews() – Dustin Williams.
- Calling layoutSubviews will use any constraints you have set to arrange the subviews. If what you’re doing doesn’t use constraints, you’ll need to setNeedsLayout and then layoutIfNeeded to force a layout update immediately.
