主菜單的Corona SDK UI按鈕

我在使用Corona SDK時有點新，而且我的主菜單按鈕有點問題。每當我按下按鈕時，它都不會移動或改變視圖;這些按鈕就會在標題屏幕中消失。主菜單的Corona SDK UI按鈕

module(..., package.seeall) 

local ui = require ("ui") 
local ui = require ("director") 

local assetPath = "assets/" 

local mainGroup = display.newGroup() 

function new(params) 
    local titleScreen = display.newImageRect(assetPath .. "Law of Magic.jpg", 
     display.contentWidth, display.contentHeight) 
    titleScreen.x = display.contentWidth/2 
    titleScreen.y = 265 
    mainGroup:insert(titleScreen) 
    director:changeScene("titleScreen") 

    local newgame = ui.newButton{ default = assetPath .. "new game.png", 
     onRelease = function(event) director:changeScene("New game") end,} 
    newgame.x = display.contentWidth/2 
    newgame.y = 445 
    mainGroup:insert(newgame) 

    local continue = ui.newButton{ default = assetPath .. "continue.png", 
     onRelease = function(event) director:changeScene("Continue") end,} 
    continue.x = display.contentWidth/2 
    continue.y = 447 
    mainGroup:insert(continue) 

    local option = ui.newButton{ default = assetPath .. "option.png", 
     onRelease = function(event) director:changeScene("Option") end,} 
    option.x = display.contentWidth/2 
    option.y = 449 
    mainGroup:insert(option) 

    local help = ui.newButton{ default = assetPath .. "help.png", 
     onRelease = function(event) director:changeScene("Help") end,} 
    help.x = display.contentWidth/2 
    help.y = 451 
    mainGroup:insert(help) 

    local exitgame = ui.newButton{ default = assetPath .. "exit game.png", 
     onRelease = function(event) director:changeScene("Exit game") end,} 
    exitgame.x = display.contentWidth/2 
    exitgame.y = 453 
    mainGroup:insert(exitgame) 

    return mainGroup 
end

來源

2012-12-27 Jelr ThirtyNine