event.phase

概述

对于 show 事件，如果场景即将变为活动状态，event.phase 为 "will" 的 字符串 值；如果场景出现在屏幕上，则为 "did"。可从对分派到 [scene][api.type.scene] 对象的 show 事件的事件侦听器访问它。如果指定了场景转换效果，则在场景效果开始执行前分派 "will" 阶段。与此相反，在效果结束后才分派 "did" 阶段。

示例

--------------------------
-- From "scene1.lua"
--------------------------
composer.gotoScene( "scene2", { effect="fade", time=800 } )

--------------------------
-- In "scene2.lua"
--------------------------
local composer = require( "composer" )
local scene = composer.newScene()

function scene:show( event )

    local phase = event.phase

    if ( phase == "will" ) then
        -- Called when the scene is still off screen (but is about to come on screen).
    elseif ( phase == "did" ) then
        -- Called when the scene is now on screen.
        -- Insert code here to make the scene come alive.
        -- Example: start timers, begin animation, play audio, etc.
    end
end

scene:addEventListener( "show" )