AddComponent Order bug

[aymen157]

This code leads to proper flexbox

var _text = GameObject.AddComponent<Text>();
var fitter = GameObject.AddComponent<ContentSizeFitter>();
fitter.verticalFit = fitter.horizontalFit = ContentSizeFitter.FitMode.PreferredSize;
this.GameObject.AddComponent<FlexLayout>(); // <----- added after creating the text.

this code leads to nothing. flexbox has no effect on the _text and its siblings.

this.GameObject.AddComponent<FlexLayout>(); // <----- added before creating the text.
var _text = GameObject.AddComponent<Text>();
var fitter = GameObject.AddComponent<ContentSizeFitter>();
fitter.verticalFit = fitter.horizontalFit = ContentSizeFitter.FitMode.PreferredSize;

[gilzoide]

Hey @aymen157 , thanks for the report.

Questions:

1. If you manually trigger a layout rebuild with either LayoutRebuilder.MarkLayoutForRebuild or LayoutRebuilder.ForceRebuildLayoutImmediate, does it fix the problem?
2. If you use a regular VerticalLayoutGroup or HorizontalLayoutGroup instead of the FlexLayout, does the bug still happens?

The Unity UI layout system is sometimes buggy when used dynamically from scripts, sometimes you need to manually trigger layout rebuilds when changing some properties from script. If this is the case, the problem would not be in FlexLayout itself, but rather the Unity UI layout engine.

[aymen157]

I do not have the project anymore, but when you would copy and paste the UI tree, it would work on the new copy just fine. Not sure if that helps you infer the issue though.