好友备注：备注名的本地显示

-- 错误：直接显示对方原始名，改名即失联
nameLabel:setString(friend.name)

local function displayName(friendId, rawName)
    local note = readLocal("note_" .. friendId)
    return note ~= nil and note or rawName
end
local function setNote(friendId, note)
    if #note > 30 then
        note = note:sub(1, 30)
    end
    writeLocal("note_" .. friendId, note)
end