fix: support sub emitter with 'PlayOnAwake'

Scripts/UIParticle.cs

@@ -1,6 +1,7 @@
 #if UNITY_2019_3_11 || UNITY_2019_3_12 || UNITY_2019_3_13 || UNITY_2019_3_14 || UNITY_2019_3_15 || UNITY_2019_4_OR_NEWER
 #define SERIALIZE_FIELD_MASKABLE
 #endif
+using System.Collections;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using Coffee.UIParticleExtensions;
@@ -60,6 +61,7 @@ namespace Coffee.UIExtensions
         private static readonly List<Material> s_PrevMaskMaterials = new List<Material>();
         private static readonly List<Material> s_PrevModifiedMaterials = new List<Material>();
         private static readonly List<Component> s_Components = new List<Component>();
+        private static readonly List<ParticleSystem> s_ParticleSystems = new List<ParticleSystem>();
 
 
         /// <summary>
@@ -407,6 +409,22 @@ namespace Coffee.UIExtensions
             InitializeIfNeeded();
         }
 
+        private new IEnumerator Start()
+        {
+            // #148: Particle Sub Emitter not showing when start game
+            var hasPlayingSubEmitter = particles.AnyFast(ps =>
+            {
+                ps.GetComponentsInChildren(false, s_ParticleSystems);
+                return s_ParticleSystems.AnyFast(p => p.isPlaying && p.subEmitters.enabled);
+            });
+            s_ParticleSystems.Clear();
+            if (!hasPlayingSubEmitter) yield break;
+
+            Stop();
+            yield return null;
+            Play();
+        }
+
         /// <summary>
         /// This function is called when the behaviour becomes disabled.
         /// </summary>

Scripts/Utils.cs

@@ -65,6 +65,16 @@ namespace Coffee.UIParticleExtensions
 
             return false;
         }
+
+        public static bool AnyFast<T>(this List<T> self, Predicate<T> predicate) where T : Object
+        {
+            for (var i = 0; i < self.Count; ++i)
+            {
+                if (self[i] && predicate(self[i])) return true;
+            }
+
+            return false;
+        }
     }
 
     internal static class MeshExtensions