Unity uses ugui to set a simple multi-level horizontal drop-down menu (no code required)

Reference resources ：Unity Use UGUI Set up a simple multi-level drop-down menu （ No code needed ）_Y-Jin heart The blog of -CSDN Blog

We need to understand these unity Know something about components ： Yes ScrollRect 、Mask 、Horizontal Layout Group  Content Size Fitter  GridLayoutGroup

design sketch ： 

Specific implementation steps ：

1. establish Image As parent node , To parent node Add corresponding components

 2. Create an empty object , For the father's day point object , Add corresponding components

Child Controls Size：width After checking, the box of sub object cannot be customized , It can only be the same as the current object , Gao Tongli
Child Force Expand: Select this sub object to automatically expand
Below Content Size Fitter, Must mount

 3. establish Toggle Control display

 4. establish Itme Sub object list , my Itme It's multi line , If it is a submenu , Components GridLayoutGroup Switch to Horizontal Layout Group

 5. matters needing attention ： Because of the above Horizontal Layout Group  It is sorted in order