import from UniRx and some modified.

Assets/UniRx.Async/Triggers/AsyncTrigger2DTrigger.cs

@@ -0,0 +1,69 @@
+
+#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+
+using System.Collections.Generic;
+using System.Threading;
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+namespace UniRx.Async.Triggers
+{
+    [DisallowMultipleComponent]
+    public class AsyncTrigger2DTrigger : AsyncTriggerBase
+    {
+        AsyncTriggerPromise<Collider2D> onTriggerEnter2D;
+        AsyncTriggerPromiseDictionary<Collider2D> onTriggerEnter2Ds;
+        AsyncTriggerPromise<Collider2D> onTriggerExit2D;
+        AsyncTriggerPromiseDictionary<Collider2D> onTriggerExit2Ds;
+        AsyncTriggerPromise<Collider2D> onTriggerStay2D;
+        AsyncTriggerPromiseDictionary<Collider2D> onTriggerStay2Ds;
+
+
+        protected override IEnumerable<ICancelablePromise> GetPromises()
+        {
+            return Concat(onTriggerEnter2D, onTriggerEnter2Ds, onTriggerExit2D, onTriggerExit2Ds, onTriggerStay2D, onTriggerStay2Ds);
+        }
+
+
+        void OnTriggerEnter2D(Collider2D other)
+        {
+            TrySetResult(onTriggerEnter2D, onTriggerEnter2Ds, other);
+        }
+
+
+        public UniTask OnTriggerEnter2DAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return GetOrAddPromise(ref onTriggerEnter2D, ref onTriggerEnter2Ds, cancellationToken);
+        }
+
+
+        void OnTriggerExit2D(Collider2D other)
+        {
+            TrySetResult(onTriggerExit2D, onTriggerExit2Ds, other);
+        }
+
+
+        public UniTask OnTriggerExit2DAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return GetOrAddPromise(ref onTriggerExit2D, ref onTriggerExit2Ds, cancellationToken);
+        }
+
+
+        void OnTriggerStay2D(Collider2D other)
+        {
+            TrySetResult(onTriggerStay2D, onTriggerStay2Ds, other);
+        }
+
+
+        public UniTask OnTriggerStay2DAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return GetOrAddPromise(ref onTriggerStay2D, ref onTriggerStay2Ds, cancellationToken);
+        }
+
+
+    }
+}
+
+#endif
+