[英]How to pass a function as a parameter in Lua?
Bit confused by all this; 有点困惑这一切; so here's what I am attempting to do! 所以这就是我想要做的! Have a def thus: 因此有一个def:
block_basic_DEF =
{
image = "button.png",
name = "basic block",
obj_table = this_obj_table.common_objects_table,
startup = function() init(), <----- This is the problem
}
In another file I access as one would expect with: 在另一个文件中,我可以通过以下方式访问:
function spawn(params)
local obj = display.newImage(params.image)
-- etc.
In that block_basic_DEF
I wish to pass the address of the init()
function such that in my spawn I can do something like: 在那个block_basic_DEF
我希望传递init()
函数的地址,这样在我的spawn中我可以做类似的事情:
params.startup()
--ie actually call the original init function params.startup()
- 实际上调用了原始的init函数
Lua functions are just values, and you can asssign them using their name without parens: Lua函数只是值,你可以使用他们的名字来设置它们而不用parens:
function init()
print("init");
end
block = {
startup = init
}
And then call it like a regular function 然后将其称为常规功能
block.startup()
It is near to OOP, but in fact it's as simple as the fact that a function is a normal value. 它接近OOP,但实际上它就像函数是正常值一样简单。
If you wanted something more similar to a lambda, you have to spell out the whole function, omitting the name: 如果你想要一个更类似于lambda的东西,你必须拼出整个函数,省略名称:
startup = function() print("init") end
You just forgot the end
keyword. 你刚忘了end
关键字。 It is part of a function definition and you can not leave it out. 它是函数定义的一部分,您不能将其遗漏。 You wouldn't leave out the closing }
in C either right? 你不会忽略C中的结束}
吗?
block_basic_DEF =
{
image = "button.png",
name = "basic block",
obj_table = this_obj_table.common_objects_table,
startup = function() init() end, -- <-- This was the problem
}
Apart form that, the following two syntax variations are equal: 除此之外,以下两种语法变体是相同的:
function foo()
end
foo = function()
end
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