如何在corona sdk應用程序中顯示用戶名

Question

我正在用corona sdk創建社交應用程序，並且用戶可以點擊兩個選項卡。一個是新聞傳送，另一個是簡介。當他們轉到配置文件選項卡時，我希望他們看到他們的照片和用戶名。問題是我的代碼顯示了我放入的內容，而不是任何用戶的用戶名。例如local userName = tostring(userName)這顯示nil。這local userName = tostring("user's username")顯示user's username。如何在登錄時顯示任何用戶的用戶名？

profile.lua：

local composer = require("composer") 
local scene = composer.newScene() 

local widget = require("widget") 
-- forward declare the text fields 
local json = require("json") 

local userName 
local userNameText 

local userName = tostring(userName) 
display.newText(userName, display.contentCenterX, display.contentCenterY, 
native.systemFont, 20) 

local function networkListener(event) 

if (event.isError) then 

    local alert = native.showAlert("Error Loading .", "Check your internet 
connection .", { "Try again" } ) 

end 
end 

function scene:create(event) 
local screenGroup = self.view 

local background = 
display.newImageRect("insta.jpg",display.contentWidth,display.contentHeight) 
background.x = display.contentCenterX 
background.y = display.contentCenterY 
screenGroup:insert(background) 

local userNameText = display.newText(userName, 200, 200, native.systemFont, 30 
) 
userNameText:setFillColor(1, 0, 0) 
screenGroup:insert(userNameText) 

end 

local tabButtons = { 
{ 
    label = "#NewsFeed", 
    width = 52, height = 10, 
    id = "newsfeed", 
    size = 16, 
    onPress = function() composer.gotoScene("newsfeed"); end, 
    selected = true 
}, 
{ 
    label = "#Profile", 
    size = 16, 
    id = "profile", 
    onPress = function() composer.gotoScene("profile"); end, 
    selected = true 
} 
} 

-- Create the widget 
local tabBar = widget.newTabBar(
{ 
    top = display.contentHeight -52, 
    width = display.contentWidth, 
    buttons = tabButtons, 
} 
) 

function scene:show(event) 

local phase = event.phase 

if (phase == "will") then 
    print("Phase started") 
elseif (phase == "did") then 
    print("phase on login") 
end 

composer.removeScene("login") 

end 

scene:addEventListener("show") 

function scene:hide(event) 

end 

function scene:destroy(event) 
end 

scene:addEventListener("create", scene) 
scene:addEventListener("show", scene) 
scene:addEventListener("hide", scene) 
scene:addEventListener("destroy", scene) 

return scene 

profile.php：

include("auth_login.php"); 

echo $_SESSION['username']; 

auth_login.php：

if(!isset($_SESSION['username'])){ 
echo"Download the app"; 
die(); 
} 

login.lua：

local composer = require("composer") 
local scene = composer.newScene() 

local widget = require("widget") 
-- forward declare the text fields 
local json = require("json") 

local username 
local pw 

local function emptyFields(event) 
if (username.text == "" or pw.text == "") then 

     local alert = native.showAlert("Empty fields", "Fill in all fields .", { "Try again" } ) 

    return true 

    else 
    return false 

    end 
    end 

    local function networkListener(event) 

    if (event.isError) then 

    local alert = native.showAlert("Error Logging In", "Check your internet connection .", { "Try again" } ) 

    else 
    if event.response == "success" then 
     -- put the code here to go to where the user needs to be 
     -- after a successful registration 
     composer.gotoScene("newsfeed") 

    else 
     -- put code here to notify the user of the problem, perhaps 
     -- a native.alert() dialog that shows them the value of event.response 
     -- and take them back to the registration screen to let them try again 
     local json = require("json") 
     print(json.prettify(event)) 
     local alert = native.showAlert("Error Logging In", event.response , { "Try again" } ) 

end 
end 
end 

local function userLogin(event) 
    if ("ended" == event.phase) then 
if emptyFields() == true then 

    else 

    local parameters = {} 
    parameters.body = "Login=1&username=" .. username.text .. "&pw=" .. pw.text 

    local URL = "http://hash.host22.com/login.php" 
    network.request(URL, "POST", networkListener, parameters) 

    local headers = {} 

    headers["Content-Type"] = "application/x-www-form-urlencoded" 
    headers["Accept-Language"] = "en-US" 

    parameters.headers = headers 

end 
end 
end 

local function registerLink(event) 
if ("ended" == event.phase) then 
    composer.gotoScene("register") 
end 
end 

    function scene:create(event) 
    local screenGroup = self.view 

    local background = 
    display.newImageRect("bg4.jpg",display.contentWidth,display.contentHeight) 
    background.x = display.contentCenterX 
    background.y = display.contentCenterY 
    screenGroup:insert(background) 

    myImage = display.newImage("hash.png") 
    -- position the image 
    myImage:translate(160, 70) 

    myText = display.newText("#Hash", 160, 140, native.systemFontBold, 40) 
    myText:setFillColor(1, 1, .5) 

username = native.newTextField(160, 200, 180, 30) -- take the local off 
since it's forward declared 
username.placeholder = "Username" 
screenGroup:insert(username) 

pw = native.newTextField(160, 270,180, 30) -- take the local off since it's 
forward declared 
pw.isSecure = true 
pw.placeholder = "Password" 
screenGroup:insert(pw) 

local Button3 = widget.newButton(
{ 
    shape = "roundedRect", 
    left = 70, 
    top = 320, 
    id = "Login", 
    label = "Login", 
    onEvent = userLogin, 
    fillColor = { default={ 0, 1, 4, 0.7 }, over={ 1, 0.5, 0.8, 4 } }, 
    labelColor = { default={ 2, 4, 1.5 }, over={ 2, 5, 1.5, 2.2 } } 
} 
) 
screenGroup:insert(Button3) 

local Button4 = widget.newButton(
{ 
    shape = "roundedRect", 
    left = 70, 
    top = 410, 
    id = "register", 
    label = "Register Here", 
    onEvent = registerLink, 
    fillColor = { default={ 2, 4, 0, 0.7 }, over={ 1, 3, 8, 4 } }, 
    labelColor = { default={ 2, 4, 1.5 }, over={ 2, 5, 1.5, 2.2 } } 
} 
) 
screenGroup:insert(Button4) 
end 

function scene:show(event) 

local phase = event.phase 

if (phase == "will") then 
    print("Phase started") 
elseif (phase == "did") then 
    print("phase on login") 
end 

composer.removeScene("register") 

end 

scene:addEventListener("show") 

function scene:hide(event) 
myText:removeSelf() 
username:removeSelf() 
pw:removeSelf() 
myImage:removeSelf() 

end 

function scene:destroy(event) 
end 

scene:addEventListener("create", scene) 
scene:addEventListener("show", scene) 
scene:addEventListener("hide", scene) 
scene:addEventListener("destroy", scene) 

return scene 

（當我做我的網站上的PHP代碼它顯示的用戶名。）

Answer 1

在你的login.lua有部分代碼：

if event.response == "success" then 
    -- put the code here to go to where the user needs to be 
    -- after a successful registration 
    composer.gotoScene("newsfeed") 

在這裏，您可以保存多種方式的用戶名：

1）把composer.setVariable前composer.gotoScene呼叫 - documentation

if event.response == "success" then 
    composer.setVariable("username", username.text) 
    composer.gotoScene("newsfeed") 

然後你可以檢索使用RNAME在profile.lua：

local userName = composer.getVariable("username") 

2）使用全局變量（簡單的解決方案）

USERNAME = username.text 
composer.gotoScene("newsfeed") 

而且在配置文件只是用它

3）寫了一些輔助管理用戶名（和用戶偏好未來）

userManager.lua

local manager = {} 

function manager.setUsername(username) 
    manager.username = username 
end 

return manager 

在login.lua：

if event.response == "success" then 
    local userManager = require("userManager") 
    userManager.setUsername(username.text) 
    composer.gotoScene("newsfeed") 

在profile.lua：

local userManager = require("userManager") 
local username = userManager.username