什么！？Unity的SetTrigger(string name)不能用了？

结论

先说结论，Unity 尽量避免SetTrigger(string name)而是用SetTrigger(int id)代替。

// 坏代码
private static string AnimatorTrgger = "Fire"

_animator.SetTrigger(AnimatorTrgger);

// 推荐代码
private static readonly int AnimatorTrgger
	= Animator.StringToHash("Fire");

_animator.SetTrigger(AnimatorTrgger);

原因是，SetTrigger(string name)内部还会计算一次Animator.StringToHash()

测试代码

    public class AnimatorTriggerPerformanceTests
    {
        private IAssetLoader _assetLoader;

        // 预计算的 Hash ID（对应 AnimatorController 中的 Trigger 参数名）
        private static readonly int AttackHash = Animator.StringToHash("Fire");

        private const string AttackString = "Fire";

        private GameObject _testObject;
        private Animator _animator;

        [SetUp]
        public void Setup()
        {
            var container = FakeContainerBuilderFactory.Create();
            _assetLoader = container.Resolve<IAssetLoader>();

            var prefab = _assetLoader.Load<GameObject>("GameUnit");
            _testObject = Object.Instantiate(prefab);
            if (!_testObject.TryGetComponent<GameUnit>(out var gameUnit))
            {
                Debug.LogError($"[UnitSpawnManager] Prefab '{prefab.name}' 上未找到 GameUnit 组件！");
                UnityEngine.Object.Destroy(_testObject);
            }
            var sprite = _assetLoader.Load<Sprite>("KnightSprite");
            var animatorController = _assetLoader.Load<RuntimeAnimatorController>($"KnightAniCon");
            gameUnit.Init(animatorController, sprite);
            _animator = gameUnit.GetComponent<Animator>();

            // 验证参数存在
            ValidateParameters();
        }

        /// <summary>
        /// 验证 AnimatorController 包含测试所需的参数
        /// </summary>
        private void ValidateParameters()
        {
            if (_animator == null || _animator.runtimeAnimatorController == null) return;

            var parameters = _animator.parameters;
            bool hasAttack = false, hasDie = false, hasJump = false;

            foreach (var param in parameters)
            {
                if (param.name == AttackString && param.type == AnimatorControllerParameterType.Trigger) hasAttack = true;
            }

            if (!hasAttack) UnityEngine.Debug.LogWarning($"AnimatorController 缺少 Trigger 参数: {AttackString}");
        }

        [TearDown]
        public void TearDown()
        {
            if (_testObject != null)
            {
                Object.DestroyImmediate(_testObject);
            }
        }

        // 验证 Animator 有效性
        [Test]
        public void Validate()
        {
            Assert.IsNotNull(_animator, "Animator 组件不能为空");
            Assert.IsNotNull(_animator.runtimeAnimatorController, "AnimatorController 不能为空");
        }

        [Test]
        [Performance]
        public void Animator_SetTrigger_String()
        {
            // 预热
            _animator.SetTrigger(AttackString);
            _animator.ResetTrigger(AttackString);

            Measure.Method(() =>
            {
                _animator.SetTrigger(AttackString);
            })
            .WarmupCount(10)
            .MeasurementCount(1000)
            .IterationsPerMeasurement(10)
            .Run();
        }

        [Test]
        [Performance]
        public void Animator_SetTrigger_Hash()
        {
            // 预热
            _animator.SetTrigger(AttackHash);
            _animator.ResetTrigger(AttackHash);

            Measure.Method(() =>
            {
                _animator.SetTrigger(AttackHash);
            })
            .WarmupCount(10)
            .MeasurementCount(1000)
            .IterationsPerMeasurement(10)
            .Run();
        }
    }

测试结果

Animator_SetTrigger_Hash：
SampleCount: 1000
Sum: 0.81 ms
Animator_SetTrigger_String：
SampleCount: 1000
Sum: 1.12 ms