横竖屏：旋转切换的界面适配

-- 错误：绝对坐标摆位，旋转全盘错位
btn:setPosition(300, 640)

local adaptive = {
    {node = btn, rx = 0.5, ry = 0.9},
    {node = tip, rx = 0.1, ry = 0.5},
}
local function relayout()
    local size = director:getWinSize()
    for _, ui in ipairs(adaptive) do
        ui.node:setPosition(
            size.width * ui.rx, size.height * ui.ry)
    end
end