FWPopupMenuArrowDirection

NS_ENUM(NSInteger, FWPopupMenuArrowDirection) {
    FWPopupMenuArrowDirectionTop = 0,  //箭头朝上
    FWPopupMenuArrowDirectionBottom,   //箭头朝下
    FWPopupMenuArrowDirectionLeft,     //箭头朝左
    FWPopupMenuArrowDirectionRight,    //箭头朝右
    FWPopupMenuArrowDirectionNone      //没有箭头
}