【界面UI】下拉刷新：邮件列表的增量拉取实现

local pulling = false
GUI:addOnTouchEvent(mailList, function(phase, dy)
    if phase == 1 and dy > 80 and pulling == false then
        pulling = true
        GUI:setText(tipText, "正在拉取新邮件")
        SL:SendNetMsg(7401, 1, 0)
    end
end)

SL:RegisterLuaNetMsg(7402, function(data)
    for _, m in ipairs(data.news) do
        table.insert(mailCache, 1, m)
        local row = GUI:RichText_Create(mailList, "", 0, 0, m.title, 340, 13, "#E8E8E8", 2, nil, "")
        table.insert(rowCache, 1, row)
    end
    GUI:setText(tipText, "共 " .. #mailCache .. " 封邮件")
    pulling = false
end)