Add option to auto-instantiate TSScheduler

Author: technyon

Lib/TSSettings.cs

@@ -0,0 +1,14 @@
+using UnityEngine;
+
+namespace TS
+{
+    public class TSSettings : ScriptableObject
+    {
+        [SerializeField]private bool _instantiateOnLoad = true;
+
+        public bool InstantiateOnLoad
+        {
+            get { return _instantiateOnLoad; }
+        }
+    }
+}

Lib/TSSettings.cs.meta

@@ -27,7 +27,7 @@ public float Progress
                 }
                 return (now - startTime) / duration ;
             }
-            set { 
+            set {
                 float now = Time.realtimeSinceStartup;
                 startTime = now - value * duration;
                 Update(now);

Lib/TSTimeDef.cs

@@ -7,6 +7,7 @@ namespace TS
     public class TSScheduler : MonoBehaviour
     {
         private static TSScheduler instance;
+        private static TSSettings settings;
 
         private List<TSTimeDef> tweens;
 
@@ -50,7 +51,29 @@ public static void KillAllDelayedCallsTo(Action<object> callback)
             }
         }
 
-        void Awake()
+        [RuntimeInitializeOnLoadMethod(loadType: RuntimeInitializeLoadType.BeforeSceneLoad)]
+        static void InitializeOnLoad() {
+            if (Settings.InstantiateOnLoad)
+            {
+                GameObject gameObject = new GameObject("TweenSharp");
+                gameObject.AddComponent<TSScheduler>();
+            }
+        }
+
+        private static TSSettings Settings
+        {
+            get
+            {
+                if (settings == null)
+                {
+                    settings = Resources.Load<TSSettings>("TSSettings");
+                }
+
+                return settings;
+            }
+        }
+        
+        private void Awake()
         {
             if (instance == null)
             {
@@ -60,6 +83,10 @@ void Awake()
 
                 TSKeywordParser.Init();
             }
+            else
+            {
+                throw new Exception("TSScheduler is a singleton, but instatiated twice. Make sure only one copy exists, and consider disabling InstantiateOnLoad in TweenSharp settings.");
+            }
         }
 
         private void Update()