Unity新输入系统.started事件失效，.performed单次点击触发两次问题

安全阿岳

2026-10-7

Unity New Input System鼠标点击事件触发异常解决方案

问题根源

事件触发异常是因为Input Action的交互配置错误：

默认无自定义交互的Button类型动作，.performed事件会在按下、释放两个节点各触发一次，所以单次点击会调用两次回调
.started、.canceled无响应是因为缺少Press交互，默认动作不会触发这两个阶段的事件

解决步骤

打开你项目中的Input Action资产文件，定位到Gameplay分组下的Shoot动作
确认动作的Action Type属性设置为Button
点击Shoot动作右侧的「+」按钮，添加Press交互
将新增的Press交互的Trigger Behavior属性设置为Press And Release

代码优化

private void OnEnable()
{
    controls.Gameplay.Shoot.started += PlayerAimingStart;
    controls.Gameplay.Shoot.performed += PlayerAimingPerformed;
}

// 必须新增取消订阅逻辑，避免内存泄漏
private void OnDisable()
{
    controls.Gameplay.Shoot.started -= PlayerAimingStart;
    controls.Gameplay.Shoot.performed -= PlayerAimingPerformed;
}

private void PlayerAimingStart(InputAction.CallbackContext ctx)
{
    shootingPositionStart = controls.Gameplay.MousePosition.ReadValue<Vector2>(); 
    shootingPositionStart.z = 0f;
}

private void PlayerAimingPerformed(InputAction.CallbackContext ctx)
{
    // 增加判空逻辑避免未按下就触发的异常
    if(shootingPositionStart == Vector3.zero) return;

    shootingPositionEnd = controls.Gameplay.MousePosition.ReadValue<Vector2>(); 
    shootingPositionEnd.z = 0f;
    Vector3 force = shootingPositionStart - shootingPositionEnd;
    Vector3 clampedForce = Vector3.ClampMagnitude(force, maxDrag) * power;
    bulletGO.GetComponent<Rigidbody2D>().AddForce(clampedForce, ForceMode2D.Impulse);

    // 重置起始位置避免下次点击复用旧值
    shootingPositionStart = Vector3.zero;
}