实现

1.在目标spine动画下新建一个空物体。

2.给空物体添加BoneFollwer脚本（sprite动画添加BoneFollwer， ui动画添加BoneFollowerGraphic）。此时spine动画上会显示出骨骼节点。

3.选择需要挂载的目标骨骼节点。此时运行会发现挂有该脚本的物体会跟随选中的骨骼节点移动。

4.给挂有脚本的物体下附加目标即可完成跟随。

代码

写个管理器方便使用。

using Spine.Unity;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class BoneFollowerMgr : MonoBehaviour
{public static BoneFollowerMgr instance;//存储spine和骨骼对象Dictionary<SkeletonRenderer, Dictionary<string, BoneFollower>> spineMap = new Dictionary<SkeletonRenderer, Dictionary<string, BoneFollower>>();void Awake(){instance = this;}//检查spine中是否存在该骨骼public bool HasBone(string boneName, SkeletonRenderer spine){return spine.Skeleton.FindBone(boneName) != null;}//获取并创建传入骨骼名称的BoneFollowerpublic BoneFollower GetBoneFollower(SkeletonRenderer spine,string boneName){if (!spineMap.ContainsKey(spine)){spine.Initialize(true);}else{if (spineMap[spine].ContainsKey(boneName))return spineMap[spine][boneName];}if (HasBone(boneName,spine)){GameObject o = new GameObject(boneName);o.transform.SetParent(spine.transform, false);BoneFollower follow = o.AddComponent<BoneFollower>();follow.boneName = boneName;follow.SkeletonRenderer = spine;Dictionary<string, BoneFollower> boneMap;if (spineMap.ContainsKey(spine)){if(spineMap[spine].Count > 0){boneMap = spineMap[spine];}else{boneMap = new Dictionary<string, BoneFollower>();}}else{boneMap = new Dictionary<string, BoneFollower>();spineMap.Add(spine,boneMap);}boneMap.Add(boneName, follow);spineMap[spine] = boneMap;return follow;}Debug.LogError("Do not have this bone!");return null;}//移除缓存中的指定spinepublic void RemoveSpine(SkeletonRenderer spine){if (spineMap.ContainsKey(spine)){spineMap.Remove(spine);}else{Debug.LogError("Do not have this spine!");}}public void RemoveAllSpine(){spineMap.Clear();}
}

测试类

using Spine.Unity;
using UnityEngine;public class TestBoneFollower : MonoBehaviour
{public Sprite sp;private void Start(){var follower = BoneFollowerMgr.instance.GetBoneFollower(GetComponent<SkeletonRenderer>(),"spear3");var o = new GameObject("o", typeof(SpriteRenderer));o.transform.SetParent(follower.transform, false);o.GetComponent<SpriteRenderer>().sprite = sp;o.transform.localScale = Vector3.one;o.transform.position = Vector3.zero;}
}