Question

我正在尝试从多个字段调用文本字段侦听器，如此页面

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

当用户开始在输入字段中写入内容时，会正常调用处理函数，但不会调用位于处理程序中的闭包。

login.lua文件如下：

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

请帮助......

Answer 1

我不知道Corona，但你的代码有些奇怪。

userNameFieldHandler做得不多，它只是创建一个调用fieldHandler的处理程序并将其存储在一个从未使用过的本地（myfunc）中。你确定你不是这个意思：

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

也许当你添加事件监听器时你意味着这一点（注意添加的()）：

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

多个文本字段的监听器

1 个答案: