我在场景之间创建加载场景时遇到了问题，我得到的解决方案是使用叠加层，我已经尝试了好几天，但由于某种原因我无法使用它。我有两个场景，一个显示项目列表，另一个显示基于单击哪一行的文本页面。问题现在是第一个场景，显示列表，下载要显示的图像，当然这需要一段时间，所以每当我转换到该屏幕时，应用程序似乎被冻结，而一切都加载。
我发现它确实进入了叠加场景，因为我输入的打印语句打印出来，但它不会显示任何内容，当我删除隐藏的代码时叠加之后，它仍然显示为挂起，它进入叠加场景，不显示任何内容，然后在最终显示叠加层之前渲染表格，而不是显示叠加层，将所有内容加载到下方，然后隐藏叠加，它似乎在当前场景中被冻结，加载下面的所有内容，显示叠加，然后立即隐藏叠加。
我的三个场景的代码在下面，我现在发布的那个是唯一一个实际工作过一次然后再来一次，它显示了叠加，而所有东西都按照我想要加载但是出于某种原因，它那次之后再也没有工作过。我对此感到非常沮丧，没有任何论坛给我一个解决方案，我真的很感激一些帮助。谢谢！
ItemListPage.lua
local composer = require ( "composer" )
local widget = require( "widget" )
local json = require( "json" )
-- Load the relevant LuaSocket modules
local http = require( "socket.http" )
local ltn12 = require( "ltn12" )
local scene = composer.newScene()
--NavigationBar elements initiated
--Removed for readability
--image handler
local function networkListener( event )
if ( event.isError ) then
print ( "Network error - download failed" )
end
print ( "event.response.fullPath: ", event.response.fullPath )
print ( "event.response.filename: ", event.response.filename )
print ( "event.response.baseDirectory: ", event.response.baseDirectory )
end
local function onRowRender( event )
-- Get reference to the row group
local row = event.row
local params=event.row.params
local itemRow=3;
-- Cache the row "contentWidth" and "contentHeight" because the row bounds can change as children objects are added
local rowHeight = row.contentHeight
local rowWidth = row.contentWidth
row.rowTitle = display.newText( row, params.topic, 0, 0, nil, 14 )
row.rowTitle:setFillColor( 0 )
row.rowTitle.anchorX = 0
row.rowTitle.x = 0
row.rowTitle.y = (rowHeight/2) * 0.5
--Other elements removed for readabilty (it's all just text objects)
--Download Image
--params referring to items[i]
local imagelink =params.imagelink
-- Create local file for saving data
local path = system.pathForFile( params.imagename, system.TemporaryDirectory )
myFile = io.open( path, "w+b" )
-- Request remote file and save data to local file
http.request{
url = imagelink,
sink = ltn12.sink.file( myFile )
}
row.Image = display.newImageRect(row, params.imagename, system.TemporaryDirectory, 25, 25)
row.Image.x = 20
row.Image.y = (rowHeight/2) * 1.5
row:insert( row.rowTitle )
row:insert( row.Image )
end
local function onRowTouch( event )
local row = event.target
local params=event.target.params
composer.removeScene(composer.getSceneName("current"))
composer.gotoScene( "itempage" , {params=params})
end
function scene:create( event )
local sceneGroup = self.view
end
function scene:show( event )
local sceneGroup = self.view
local phase = event.phase
if phase == "will" then
-- Called when the scene is still off screen and is about to move on screen
--overlay
composer.showOverlay( "loading", { isModal = true })
elseif phase == "did" then
--Table stuff
local scrollBarOptions = {
sheet = scrollBarSheet, -- Reference to the image sheet
topFrame = 1, -- Number of the "top" frame
middleFrame = 2, -- Number of the "middle" frame
bottomFrame = 3 -- Number of the "bottom" frame
}
-- Table
local tableView = widget.newTableView(
{
left = 0,
top = navBar.height,
height = display.contentHeight-navBar.height,
width = display.contentWidth,
onRowRender = onRowRender,
onRowTouch = onRowTouch,
listener = scrollListener
}
)
--json work
local filename = system.pathForFile( "items.json", system.ResourceDirectory )
local decoded, pos, msg = json.decodeFile( filename )
if not decoded then
print( "Decode failed at "..tostring(pos)..": "..tostring(msg) )
else
print( "File successfully decoded!" )
end
local items=decoded.items
-- create a white background to fill screen
local background = display.newRect( display.contentCenterX, display.contentCenterY, display.contentWidth, display.contentHeight )
background:setFillColor( 1 ) -- white
sceneGroup:insert( background )
-- Insert rows
for i = 1, #items do
-- Insert a row into the tableView
print( "Adding a row!" )
tableView:insertRow{
rowHeight = 100,
rowColor = { default={ 0.8, 0.8, 0.8, 0.8 } },
lineColor = { 1, 0, 0 },
params=items[i]
}
end
sceneGroup:insert( tableView )
composer.hideOverlay( "fade", 100 )
end
end
-- other functions and elements unused and removed for readability
loading.lua
local composer = require ( "composer" )
local widget = require( "widget" )
local json = require( "json" )
local scene = composer.newScene()
-- Create the widget
function scene:create( event )
local sceneGroup = self.view
local background = display.newRect( display.contentCenterX, display.contentCenterY, display.contentWidth, display.contentHeight )
background:setFillColor( 1 ) -- white
local text = display.newText( "Loading scene", 0, 0, nil, 14 )
text:setFillColor( 0 )
text.anchorX = display.contentCenterX
text.x = display.contentCenterX
text.y = display.contentCenterY
sceneGroup:insert( background )
sceneGroup:insert( text )
print ( "In loading create")
end
function scene:show( event )
local sceneGroup = self.view
local phase = event.phase
if phase == "will" then
elseif phase == "did" then
print ( "In loading show")
end
end
-- other functions and elements unused and removed for readability
ItemDisplayPage.lua
local composer = require ( "composer" )
local widget = require( "widget" )
local json = require( "json" )
local scene = composer.newScene()
--NavigationBar elements initiated
--This creates the "back button", when clicked it returns to the previous scene, in this case "itemListPage"
--it takes, no parameters
local function handleLeftButton( event )
if ( event.phase == "ended" ) then
composer.removeScene(composer.getSceneName("current"))
composer.gotoScene(composer.getSceneName("previous"))
end
return true
end
--Remaining navbar elements removed for readability
function scene:create( event )
local sceneGroup = self.view
local params=event.params
-- create a white background to fill screen
local background = display.newRect( display.contentCenterX, display.contentCenterY, display.contentWidth, display.contentHeight )
background:setFillColor( 1 ) -- white
--creating header bar
local bar = display.newRect( navBar.height + (headerBarHeight*0.5), display.contentCenterY, display.contentWidth, headerBarHeight )
bar:setFillColor( 1 )
-- create stuff
local title = display.newText(params.topic, 0, 0, nil, 14 )
title:setFillColor( 0 )
title.anchorX = 0
title.x = margin
title.y = ((2*headerBarHeight/2) * 0.5)+navBar.height
local Image = display.newImageRect(params.imagename, system.TemporaryDirectory, 25, 25)
Image.x = 50
Image.y = display.contentCenterY
-- all objects must be added to group (e.g. self.view)
sceneGroup:insert( background )
sceneGroup:insert( title )
sceneGroup:insert( Image)
end
-- other functions and elements unused and removed for readability
答案 0 :(得分：0)
我建议您不要使用scene.show事件进行加载。
使用timer.performWithDelay加载所有数据：
--in scene:show
elseif phase == "did" then
timer.performWithDelay(0, function()
local scrollBarOptions = {
--put your code here
composer.hideOverlay( "fade", 100 )
end)
您当前的代码没有显示叠加层，因为引擎会在渲染任何内容之前等待场景：显示事件。因此，在加载所有图像之后，重叠和图像的渲染出现。
在我的代码中timer.performWithDelay没有阻止scene:show执行，因此您会在加载图片之前看到叠加效果