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[davejones]

I am developing a UI drop down list in Unity3D.  How do I make the animator stay on animation state rather than resetting to idle on re enable of GameObject?  
 
I have listed below the issue in points

- press UI button that plays drop down animation clip
- press same UI button again and fold up animation clip is played
- press UI button and drop down plays again
- set GameObject active to false when the drop down clip has been played
- Set GameObject to true whilst the list is dropped down
- press button to try and fold up but doesn't work like before GameObject was set to false.

I have attached the class used OnClick of the UI button below. I want the same behaviour that was apparent before the GameObject was set to false. The link is to a video that shows the issue.

https://gfycat.com/gifs/detail/skinnynegativechuckwalla

Code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class CustomDropDown : MonoBehaviour {
 
    public GameObject SubMenu;
    [HideInInspector]
    public int State = 0;
 
    Animator AniPlayer;
 
    public void BtnDropDown()
    {
        if (AniPlayer.GetInteger("MenuState") == 0)
        {
            AniPlayer.SetInteger("MenuState", 1);
        }
 
 
        else if (AniPlayer.GetInteger("MenuState") == 1)
        {
            AniPlayer.SetInteger("MenuState", 0);
        }
    }
        // Use this for initialization
        void Start() {
            AniPlayer = this.GetComponent<Animator>();
        }
 
    }

[davejones]

Psuedocode

onEnable

menu state = current state

OnDisable

menu state = current state

 

I suppose its just a case of finding out how to do this because I believe the issue is that the animation state machine  resets on disabling/ re enabling of the GameObject.

[Ordnas]

Yes, from the video it seems that everytime a GameObject enables, it will call some Reset function that will reset all the states of each component (in this case the Animator Controller). For sure in your code you should save your state everytime  BtnDropDown() is called:

private int MenuState = 0;

public void BtnDropDown()
    {
        if (AniPlayer.GetInteger("MenuState") == 0)
        {
            AniPlayer.SetInteger("MenuState", 1);
            MenuState = 1;
        }
   [...]

To set the cached value again every OnEnable, you could try to add it on the Start() function (I suppose it will be called every OnEnable, you could try and see if it works):

void Start() {
            AniPlayer = this.GetComponent<Animator>();

            if (AniPlayer != nullptr) AniPlayer.SetInteger("MenuState", MenuState);
        }

[besttof]

OR you set

Code:

AniPlayer.keepAnimatorControllerStateOnDisable = true

. They only added that pretty recently, but it seems the best way to do it 

[TonyLi]

This is more of a side note, but if you're concerned about performance, avoid putting Animators on UI elements unless they actually change state every single frame. Animators dirty the layout every frame, forcing a recalc every frame. (reference)

Instead, you could use your own tween code (or something like DOTween), which would also let you retain state between enables and disables.

Or use an Animation or Simple Animation component with the clip's wrap mode set to Once. They disable themselves when they're done playing the clip, so they don't keep dirtying the UI every frame.