fix build error and something

Scripts/UIParticle.cs

@@ -252,7 +252,7 @@ namespace Coffee.UIExtensions
             RefreshParticles(gameObject);
         }
 
-        public void RefreshParticles(GameObject root)
+        private void RefreshParticles(GameObject root)
         {
             if (!root) return;
             root.GetComponentsInChildren(particles);
@@ -304,6 +304,8 @@ namespace Coffee.UIExtensions
 
         internal void UpdateRenderers()
         {
+            if (!isActiveAndEnabled) return;
+
             var bakeCamera = GetBakeCamera();
             for (var i = 0; i < m_Renderers.Count; i++)
             {
@@ -328,7 +330,15 @@ namespace Coffee.UIExtensions
             _tracker.Add(this, rectTransform, DrivenTransformProperties.Scale);
             UIParticleUpdater.Register(this);
             RegisterDirtyMaterialCallback(UpdateRendererMaterial);
-            RefreshParticles(particles);
+
+            if (0 < particles.Count)
+            {
+                RefreshParticles(particles);
+            }
+            else
+            {
+                RefreshParticles();
+            }
 
             base.OnEnable();
         }

Scripts/UIParticleRenderer.cs

@@ -113,17 +113,18 @@ namespace Coffee.UIExtensions
             _particleSystem = null;
             _renderer = null;
             _prevParticleCount = 0;
-            if (0 <= index )
+            if (0 <= index)
             {
                 _index = index;
             }
             //_emitter = null;
-
-            material = null;
-            enabled = false;
-
-            workerMesh.Clear();
-            canvasRenderer.SetMesh(workerMesh);
+            if (this && isActiveAndEnabled)
+            {
+                material = null;
+                workerMesh.Clear();
+                canvasRenderer.SetMesh(workerMesh);
+                enabled = false;
+            }
         }
 
         public void Set(UIParticle parent, ParticleSystem particleSystem, bool isTrail)
@@ -171,7 +172,7 @@ namespace Coffee.UIExtensions
         {
             // No particle to render: Clear mesh.
             if (
-                !enabled || !_particleSystem || !_parent || !canvasRenderer || !canvas || !bakeCamera
+                !isActiveAndEnabled || !_particleSystem || !_parent || !canvasRenderer || !canvas || !bakeCamera
                 || _parent.meshSharing == UIParticle.MeshSharing.Reprica
                 || !transform.lossyScale.GetScaled(_parent.scale3D).IsVisible()     // Scale is not visible.
                 || (!_particleSystem.IsAlive() && !_particleSystem.isPlaying)       // No particle.

Scripts/UIParticleUpdater.cs

@@ -89,7 +89,7 @@ namespace Coffee.UIExtensions
             s_UpdatedGroupIds.Clear();
 
             // Attract
-            for(var i = 0;i< s_ActiveAttractors.Count;i++)
+            for (var i = 0; i < s_ActiveAttractors.Count; i++)
             {
                 s_ActiveAttractors[i].Attract();
             }