監聽多個文本字段

Question

我試圖調用來自多個領域的文本字段聽衆喜歡本頁

http://docs.coronalabs.com/api/library/native/newTextField.html#listener-optional

當用戶開始寫在輸入欄的東西，處理功能正常，但所謂的封即位於處理程序不被調用。

像下面login.lua文件：

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

-- Forward declerations  
local userNameField 

-- TextField Listener 
local function fieldHandler(getObj) 

    print("This message is showing up :) ") 

    -- Use Lua closure in order to access the TextField object 
    return function(event) 

     print("This message is not showing up :(There is something wrong here!!!") 

     if ("began" == event.phase) then 
      -- This is the "keyboard has appeared" event 
      getObj().text = "" 
      getObj():setTextColor(0, 0, 0, 255) 

     elseif ("ended" == event.phase) then 
     -- This event is called when the user stops editing a field: 
     -- for example, when they touch a different field or keyboard focus goes away 

      print("Text entered = " .. tostring(getObj().text)) -- display the text entered 
     elseif ("submitted" == event.phase) then 
     -- This event occurs when the user presses the "return" key 
     -- (if available) on the onscreen keyboard 
     -- Hide keyboard 
      native.setKeyboardFocus(nil) 
     end 
    end -- "return function()" 
end 

local function userNameFieldHandler(event) 
    local myfunc = fieldHandler(function() return userNameField end) -- passes the text field object 
end 

-- Called when the scene's view does not exist: 
function scene:createScene(event) 
    local group = self.view 

-- Create our Text Field 
    userNameField = native.newTextField(display.contentWidth * 0.1, display.contentHeight * 0.5, display.contentWidth * 0.8, display.contentHeight * 0.08) 

    userNameField:addEventListener("userInput", userNameFieldHandler) 
    userNameField.font = native.newFont(native.systemFontBold, 22) 
    userNameField.text = "User Name" 
    userNameField:setTextColor(0, 0, 0, 12) 
end 

請幫助...

Answer 1

不知電暈，但你的代碼是有些奇怪。

userNameFieldHandler沒有太大的作用，它只是創建一個處理程序，調用fieldHandler並將其存儲在一個從未使用過的本地（myfunc）中。你確定你不是故意這樣的：當你添加事件監聽你的意思是這個

local function userNameFieldHandler(event) 
    local myfunc = fieldHandler( 
     function() return userNameField end) -- passes the text field object 
    return myfunc --<<<<--- added return 
end 

，也許（注意添加()）：

userNameField:addEventListener("userInput", userNameFieldHandler())