Timer.delayedCall parameters nil

AlaaEddine · October 2013

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 · October 2013

function test(args)

ar2rsawseen · October 2013

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 · October 2013

Thank you, I understand the difference now

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