Timer.delayedCall parameters nil

AlaaEddine

Hello, I have this code

GameScene = gideros.class(Sprite)


function GameScene:init()
Timer.delayedCall(15,self.test,{param1 ="p1", param2 = "p2"})
end


function GameScene:test(args)
print(args.param1)
print(args.param2)
end

when I run it I have an error "attempt to index local 'args' (a nil value)".
but when I change it like follows it works

GameScene = gideros.class(Sprite)
function GameScene:init()
Timer.delayedCall(15,test,{param1 ="p1", param2 = "p2"})

end

function test (args)
print(args.param1)
print(args.param2)
end

any suggestion??

AlaaEddine

function test(args)

ar2rsawseen

Yes that is the way Lua OOP works
if you define method through colon (:), it means it accepts first argument as self automatically.
So you can do stuff like that:

local s = Sprite.new() s:setPosition(100, 100)

Which underneath is actually this:

local s = Sprite.new() Sprite.setPosition(s, 100, 100)

Note the difference with calling function with colon : or dot .

So the correct way to handle this situation would be either like this:

function GameScene:init() self.param1 = "p1" self.param2 = "p2" Timer.delayedCall(15,self.test,self) end     function GameScene:test() print(self.param1) print(self.param2) end

or like this:

function GameScene:init() Timer.delayedCall(15, function() self:test({param1 ="p1", param2 = "p2"}) end) end     function GameScene:test(args) print(args.param1) print(args.param2) end

AlaaEddine

Thank you, I understand the difference now