Finger Touch 是一種處理手勢識別的插件，在遊戲開發中經常會用到，這裏我先簡單介紹一下Finger Touch（如有錯誤 歡迎指正） :

#region Event
// Fired when a finger begins touching the screen (LeanFinger = The current finger)
public static System.Action<CheapFinger> OnFingerDown;
// Fired when a finger stops touching the screen (LeanFinger = The current finger)
public static System.Action<CheapFinger> OnFingerUp;
// Fired when a finger taps the screen (this is when a finger begins and stops touching the screen within the ‘TapThreshold‘ time) (LeanFinger = The current finger)
public static System.Action<CheapFinger> OnFingerTap;
// Fired when a finger swipes the screen (this is when a finger begins and stops touching the screen within the ‘TapThreshold‘ time, and also moves more than the ‘SwipeThreshold‘ distance) (LeanFinger = The current finger)
public static System.Action<CheapFinger> OnFingerSwipe;
// Fired when a finger begins being held on the screen (this is when a finger has been set for longer than the ‘HeldThreshold‘ time) (LeanFinger = The current finger)
public static System.Action<CheapFinger> OnFingerHeldDown;

// Fired when at least one finger taps the screen (int = Highest Finger Count)
public static System.Action<int> OnMultiTap;

// add: pinch/drag start/end event
public static System.Action OnPinchStart;
public static System.Action OnPinchEnd;
public static System.Action<CheapFinger> OnDragStart;
public static System.Action OnDragEnd;
#endregion

Finger touch 中 事件 有以上 按下 、擡起、敲擊、扭轉、長按、多指敲擊、拖拽等

其次介紹一下：TouchScreen (自定義類)

TouchScreen 中 在 做 4件事

第一：監測手勢觸發點

第二: 將屏幕觸發點轉化為射線

第三：通過射線檢測是否觸發到某個obj

第四：將射線傳遞給Lua

簡要代碼 如下：

public void Tick(float deltaTime)
{
if (Input.touchCount > 0 && (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(0).phase == TouchPhase.Stationary))
{
_currentTouchTime += deltaTime;
if (_currentTouchTime > MIN_TIME)
{
_currentTouchTime = 0.0f;
CallLuaFunction(ON_TOUCH_MOVE);
}
}
#if UNITY_STANDALONE_WIN
else if(Input.GetMouseButton(0))
{
_currentTouchTime += deltaTime;
if (_currentTouchTime > MIN_TIME)
{
_currentTouchTime = 0.0f;
CallLuaFunction(ON_TOUCH_MOVE);
}
}
#endif
else
{
_currentTouchTime = 0.0f;
}
}

private void CallLuaFunction(string functionName)
{
if (string.IsNullOrEmpty(functionName))
{
return;
}
var ray = rayCamera.ScreenPointToRay(Input.mousePosition);

var hitInfo = GetRayCastHit ();
if (hitInfo != null && hitInfo.Length > 0)
{
if (!HitUI(Input.mousePosition))
{
LuaScriptMgr.Instance.CallLuaFunction("TouchAgent." + functionName, hitInfo);
}
}
}

CheapTouch 繼承MonoBehavior ,CheapTouch 實現OnEnable、Update方法；

我們要在OnEnable 和 update 裏做什麽處理呢？這個就是需要和Lua 邏輯 關聯起來

OnEnable 中 設置當前實例，也就是當CheapTouch 掛到遊戲某個對象上時 實例化 該 腳本。

Update 中做二件事：

1.TouchScreen 實例傳給Lua

2.更新各種操作和事件 如：

UpdateFingers();
UpdateMultiTap();
UpdateGestures();
UpdateEvents();

UpdateEvent();處理事件 包括 點擊 拖拽 扭轉 等等並調用Lua

例如點擊 事件：

private void RaiseFingerDownEvent(CheapFinger finger)
{
finger.SetCurUIGameObject();
fingerType = FINGER_DOWN;
CallLuaEventMethod(finger);

if (OnFingerDown != null)
{
OnFingerDown(finger);
}
}

Lua 中使用Finger Touch 處理手勢識別