fixed #3599. use a scheduler to fix the position of editbox when it's parent postion has been changed

extensions/GUI/CCEditBox/CCEditBox.cpp

@@ -28,6 +28,8 @@
 
 NS_CC_EXT_BEGIN
 
+static const float CHECK_EDITBOX_POSITION_INTERVAL = 0.1f;
+
 EditBox::EditBox(void)
 : _editBoxImpl(NULL)
 , _delegate(NULL)
@@ -332,8 +334,19 @@ void EditBox::onEnter(void)
     {
         _editBoxImpl->onEnter();
     }
+#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS || CC_TARGET_PLATFORM == CC_PLATFORM_MAC)
+    this->schedule(schedule_selector(EditBox::updatePosition), CHECK_EDITBOX_POSITION_INTERVAL);
+#endif
 }
 
+void EditBox::updatePosition(float dt)
+{
+    if (nullptr != _editBoxImpl) {
+        _editBoxImpl->updatePosition(dt);
+    }
+}
+
+
 void EditBox::onExit(void)
 {
     ControlButton::onExit();

extensions/GUI/CCEditBox/CCEditBox.h

@@ -418,6 +418,7 @@ public:
     void touchDownAction(Ref *sender, Control::EventType controlEvent);
     
 protected:
+    void updatePosition(float dt);
     EditBoxImpl*      _editBoxImpl;
     EditBoxDelegate*  _delegate;
     

extensions/GUI/CCEditBox/CCEditBoxImpl.h

@@ -69,6 +69,11 @@ public:
     virtual void setVisible(bool visible) = 0;
     virtual void setContentSize(const Size& size) = 0;
 	virtual void setAnchorPoint(const Point& anchorPoint) = 0;
+    
+    /**
+     * check the editbox's position, update it when needed
+     */
+    virtual void updatePosition(float dt){};
     /**
      * @js NA
      * @lua NA

extensions/GUI/CCEditBox/CCEditBoxImplIOS.h

@@ -101,6 +101,7 @@ public:
     virtual void setVisible(bool visible);
     virtual void setContentSize(const Size& size);
 	virtual void setAnchorPoint(const Point& anchorPoint);
+    virtual void updatePosition(float dt) override;
     /**
      * @js NA
      * @lua NA
@@ -116,7 +117,6 @@ public:
     virtual void closeKeyboard();
 	
 	virtual void onEndEditing();
-    
 private:
 	void			initInactiveLabels(const Size& size);
 	void			setInactiveText(const char* pText);

extensions/GUI/CCEditBox/CCEditBoxImplIOS.mm

@@ -614,7 +614,6 @@ void EditBoxImplIOS::setAnchorPoint(const Point& anchorPoint)
 
 void EditBoxImplIOS::visit(void)
 {
-    
 }
 
 void EditBoxImplIOS::onEnter(void)
@@ -626,6 +625,15 @@ void EditBoxImplIOS::onEnter(void)
     }
 }
 
+void EditBoxImplIOS::updatePosition(float dt)
+{
+    if (nullptr != _systemControl) {
+        this->adjustTextFieldPosition();
+    }
+}
+
+
+
 void EditBoxImplIOS::adjustTextFieldPosition()
 {
 	Size contentSize = _editBox->getContentSize();

extensions/GUI/CCEditBox/CCEditBoxImplMac.h

@@ -107,6 +107,7 @@ public:
     virtual void doAnimationWhenKeyboardMove(float duration, float distance);
     virtual void openKeyboard();
     virtual void closeKeyboard();
+    virtual void updatePosition(float dt) override;
     /**
      * @js NA
      * @lua NA

extensions/GUI/CCEditBox/CCEditBoxImplMac.mm

@@ -382,6 +382,14 @@ NSPoint EditBoxImplMac::convertDesignCoordToScreenCoord(const Point& designCoord
     return screenPos;
 }
 
+void EditBoxImplMac::updatePosition(float dt)
+{
+    if(nullptr != _sysEdit)
+    {
+        adjustTextFieldPosition();
+    }
+}
+
 void EditBoxImplMac::adjustTextFieldPosition()
 {
 	Size contentSize = _editBox->getContentSize();