Method clearUserString

MyGUIEngine/src/MyGUI_WidgetUserData.cpp:33–42

	}

	bool UserData::clearUserString(std::string_view _key)
	{
		MapString::iterator iter = mMapUserString.find(_key);
		if (iter != mMapUserString.end())
		{
			mMapUserString.erase(iter);
			return true;
		}
		return false;
	}

	bool UserData::isUserString(std::string_view _key) const
	{