Add UniTask Support

Assets/UniTask.YooAsset~/OperationHandleBaseExtensions.cs

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+using System;
+using YooAsset;
+using static Cysharp.Threading.Tasks.Internal.Error;
+
+namespace Cysharp.Threading.Tasks
+{
+    public static class OperationHandleBaseExtensions
+    {
+        public static UniTask.Awaiter GetAwaiter(this OperationHandleBase handle)
+        {
+            return ToUniTask(handle).GetAwaiter();
+        }
+
+        public static UniTask ToUniTask(this OperationHandleBase handle,
+                                        IProgress<float>         progress = null,
+                                        PlayerLoopTiming         timing   = PlayerLoopTiming.Update)
+        {
+            ThrowArgumentNullException(handle, nameof(handle));
+
+            if(!handle.IsValid)
+            {
+                return UniTask.CompletedTask;
+            }
+
+            return new UniTask(
+                OperationHandleBaserConfiguredSource.Create(
+                    handle,
+                    timing,
+                    progress,
+                    out var token
+                ),
+                token
+            );
+        }
+
+        sealed class OperationHandleBaserConfiguredSource : IUniTaskSource,
+                                                            IPlayerLoopItem,
+                                                            ITaskPoolNode<OperationHandleBaserConfiguredSource>
+        {
+            private static TaskPool<OperationHandleBaserConfiguredSource> pool;
+
+            private OperationHandleBaserConfiguredSource nextNode;
+
+            public ref OperationHandleBaserConfiguredSource NextNode => ref nextNode;
+
+            static OperationHandleBaserConfiguredSource()
+            {
+                TaskPool.RegisterSizeGetter(typeof(OperationHandleBaserConfiguredSource), () => pool.Size);
+            }
+
+            private readonly Action<OperationHandleBase>            continuationAction;
+            private          OperationHandleBase                    handle;
+            private          IProgress<float>                       progress;
+            private          bool                                   completed;
+            private          UniTaskCompletionSourceCore<AsyncUnit> core;
+
+            OperationHandleBaserConfiguredSource() { continuationAction = Continuation; }
+
+            public static IUniTaskSource Create(OperationHandleBase handle,
+                                                PlayerLoopTiming    timing,
+                                                IProgress<float>    progress,
+                                                out short           token)
+            {
+                if(!pool.TryPop(out var result))
+                {
+                    result = new OperationHandleBaserConfiguredSource();
+                }
+
+                result.handle    = handle;
+                result.progress  = progress;
+                result.completed = false;
+                TaskTracker.TrackActiveTask(result, 3);
+
+                if(progress is not null)
+                {
+                    PlayerLoopHelper.AddAction(timing, result);
+                }
+
+                switch(handle)
+                {
+                    case AssetOperationHandle asset_handle:
+                        asset_handle.Completed += result.continuationAction;
+                        break;
+                    case SceneOperationHandle scene_handle:
+                        scene_handle.Completed += result.continuationAction;
+                        break;
+                    case SubAssetsOperationHandle sub_asset_handle:
+                        sub_asset_handle.Completed += result.continuationAction;
+                        break;
+                }
+
+                token = result.core.Version;
+
+                return result;
+            }
+
+            private void Continuation(OperationHandleBase _)
+            {
+                switch(handle)
+                {
+                    case AssetOperationHandle asset_handle:
+                        asset_handle.Completed -= continuationAction;
+                        break;
+                    case SceneOperationHandle scene_handle:
+                        scene_handle.Completed -= continuationAction;
+                        break;
+                    case SubAssetsOperationHandle sub_asset_handle:
+                        sub_asset_handle.Completed -= continuationAction;
+                        break;
+                }
+
+                if(completed)
+                {
+                    TryReturn();
+                }
+                else
+                {
+                    completed = true;
+                    if(handle.Status == EOperationStatus.Failed)
+                    {
+                        core.TrySetException(new Exception(handle.LastError));
+                    }
+                    else
+                    {
+                        core.TrySetResult(AsyncUnit.Default);
+                    }
+                }
+            }
+
+            bool TryReturn()
+            {
+                TaskTracker.RemoveTracking(this);
+                core.Reset();
+                handle   = default;
+                progress = default;
+                return pool.TryPush(this);
+            }
+
+            public UniTaskStatus GetStatus(short token) => core.GetStatus(token);
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            public void GetResult(short token) { core.GetResult(token); }
+
+            public UniTaskStatus UnsafeGetStatus() => core.UnsafeGetStatus();
+
+            public bool MoveNext()
+            {
+                if(completed)
+                {
+                    TryReturn();
+                    return false;
+                }
+
+                if(handle.IsValid)
+                {
+                    progress?.Report(handle.Progress);
+                }
+
+                return true;
+            }
+        }
+    }
+}

Assets/UniTask.YooAsset~/OperationHandleBaseExtensions.cs.meta

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+fileFormatVersion: 2
+guid: e1c9a3a6de2246bf88547a6b59b99b9f
+timeCreated: 1650851321

Assets/UniTask.YooAsset~/README.md

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+# UniTask 扩展
+
+[仓库链接](https://github.com/Cysharp/UniTask) 
+- 请去下载对应的源码，并删除此目录最后的波浪线
+- 在 UniTask `_InternalVisibleTo.cs` 文件中增加 `[assembly: InternalsVisibleTo("UniTask.YooAsset")]` 后即可使用
+
+## 代码示例
+
+```csharp
+var handle = YooAssets.LoadAssetAsync<GameObject>("Assets/Res/Prefabs/TestImg.prefab");
+
+await handle.ToUniTask();
+
+var obj = handle.AssetObject as GameObject;
+var go  = Instantiate(obj, transform);
+
+go.transform.localPosition = Vector3.zero;
+go.transform.localScale    = Vector3.one;
+```

Assets/UniTask.YooAsset~/UniTask.YooAsset.asmdef

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+{
+    "name": "UniTask.YooAsset",
+    "rootNamespace": "",
+    "references": [
+        "GUID:e34a5702dd353724aa315fb8011f08c3",
+        "GUID:f51ebe6a0ceec4240a699833d6309b23"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Assets/UniTask.YooAsset~/UniTask.YooAsset.asmdef.meta

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+fileFormatVersion: 2
+guid: cf4f1d4730c114c48ab680458e5a2455
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: