Unity3D之Mecanim动画系统学习笔记（六）：使用脚本控制动画 控制人物动画播放 State Machine Behavior
这里我重新弄了一个简单的场景和新的Animator Controller来作为示例。
下面先看看Animator Controller的配置：
人物在站立状态只能进入走路，走路只能进入奔跑或返回站立，奔跑只能进入跳跃或返回走路，跳跃则只能返回奔跑。
参数方面为两个参数：
- Float类型的moveSpeed；
- Trigger类型的Jump；
连线直接的转换条件为：moveSpeed大于0.1进入走路，走路moveSpeed大于0.9进入奔跑小于0.1返回站立，奔跑moveSpeed小于0.9返回走路，Jump被触发则进入跳跃；
为人物添加Animator组件并绑定上面的Animator Controller文件，同时绑定下面的脚本：
1 using UnityEngine;
2 using System.Collections;
3
4 public class TestAnim : MonoBehaviour
5 {
6 //将名称转换为哈希值可以提高索引的速度
7 private int moveSpeed = Animator.StringToHash("moveSpeed");
8 private int jump = Animator.StringToHash("Jump");
9 private int runState = Animator.StringToHash("Base Layer.Run");
10
11 private Animator _animator;
12
13 void Start()
14 {
15 _animator = this.GetComponent<Animator>();
16 }
17
18 void Update()
19 {
20 float speed = Input.GetAxis("Vertical");
21 _animator.SetFloat(moveSpeed, speed);
22
23 //获取动画的当前状态
24 AnimatorStateInfo info = _animator.GetCurrentAnimatorStateInfo(0);
25 //跳跃除了要按下空格键外, 还需要处于奔跑状态才行, 否则按下空格键时就会标记 Jump, 一进入奔跑就马上跳跃
26 if(Input.GetKeyDown(KeyCode.Space) && info.fullPathHash == runState)
27 {
28 _animator.SetTrigger(jump);
29 }
30 }
31 }
State Machine Behavior
在Unity5.0中，我们可以给Animator Controller中的每个State添加脚本了，类似于专门用于GameObject的MonoBehavior，State可以添加State Machine Behavior，我们打开任意的Animator Controller，就可以在Inspector窗口发现添加脚本的按钮：
除了State外，我们还可以在层上添加，层可以看做包含了整个State的一个大State：
我们可以添加一个脚本看看，下面是我添加了注释的State Machine Behavior脚本的标准形式：
1 using UnityEngine;
2 using System.Collections;
3
4 public class StateScript : StateMachineBehaviour
5 {
6 // OnStateEnter is called before OnStateEnter is called on any state inside this state machine
7 override public void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
8 {
9 //进入当前状态时会被调用
10 }
11
12 // OnStateUpdate is called before OnStateUpdate is called on any state inside this state machine
13 override public void OnStateUpdate(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
14 {
15 //进入当前状态的每帧会被调用
16 }
17
18 // OnStateExit is called before OnStateExit is called on any state inside this state machine
19 override public void OnStateExit(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
20 {
21 //退出当前状态时会被调用
22 }
23
24 // OnStateMove is called before OnStateMove is called on any state inside this state machine
25 override public void OnStateMove(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
26 {
27 }
28
29 // OnStateIK is called before OnStateIK is called on any state inside this state machine
30 override public void OnStateIK(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
31 {
32 }
33
34 // OnStateMachineEnter is called when entering a statemachine via its Entry Node
35 override public void OnStateMachineEnter(Animator animator, int stateMachinePathHash)
36 {
37 }
38
39 // OnStateMachineExit is called when exiting a statemachine via its Exit Node
40 override public void OnStateMachineExit(Animator animator, int stateMachinePathHash)
41 {
42 }
43 }
通过使用State Machine Behaviour我们可以更加方便的在特定的时间点触发一些我们需要的事件，但是需要注意的是，我们一般给State Machine Behaviour赋值一些场景的对象不是直接在Inspector面板里拖拽而是通过Animator的GetBehavior方法获取到指定的State Machine Behaviour的实例后通过脚本进行赋值的。