关于行为树可视化插件BehaviorDesigner

 

1、BehaviorTree的生命周期

// OnAwake is called once when the behavior tree is enabled. Think of it as a constructor
public virtual void OnAwake();
// OnStart is called immediately before execution. It is used to setup any variables that need to be reset from the previous run
public virtual void OnStart();
// OnUpdate runs the actual task
public virtual TaskStatus OnUpdate();
// OnEnd is called after execution on a success or failure.
public virtual void OnEnd();
// OnPause is called when the behavior is paused and resumed
public virtual void OnPause(bool paused);
// The priority select will need to know this tasks priority of running
public virtual float GetPriority();
// OnBehaviorComplete is called after the behavior tree finishes executing
public virtual void OnBehaviorComplete();
// OnReset is called by the inspector to reset the public properties
public virtual void OnReset();
// Allow OnDrawGizmos to be called from the tasks
public virtual void OnDrawGizmos();
// Keep a reference to the behavior that owns this task
public Behavior Owner;

重点说明，尤其在有重复repeat节点时，OnAwake、OnStart、OnUpdate、OnEnd、OnPause 都是节点自身的生命周期的通知，而OnBehaviorComplete是整个行为树结束时对每个task的通知。

在debug明显可以看到OnAwake只执行一次，OnStart、OnUpdate、OnEnd会执行很多次(因为Repeat节点反复执行task)，OnUpdate更特殊，如果return状态Runing会不停执行知道非Running。而OnBehaviorComplete是只在整个行为停止以后通知，可以代替普通MonoBehavior的OnDestroy来执行兜底清理逻辑。