1 files changed, 1 insertions, 0 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs
index 592ea4d..198d5b0 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs
@@ -322,6 +322,7 @@ namespace UnityEngine.EventSystems
                 // Save the drag handler as well
                 pointerEvent.pointerDrag = ExecuteEvents.GetEventHandler<IDragHandler>(currentOverGo);
 
+                // 只有包含IDragHandler接口时才会触发IInitializePotentialDragHandler接口
                 if (pointerEvent.pointerDrag != null)
                     ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.initializePotentialDrag);
             }