Unity XLua之协程

如何使用xlua实现协程，示例代码如下：

转载请注明出处：https://www.cnblogs.com/jietian331/p/10735773.html

local unpack = unpack or table.unpack;
local function async_to_sync(async_func, callback_pos)
    return function(...)
        local _co = coroutine.running() or error ('this function must be run in coroutine')
        local rets
        local waiting = false
        local function cb_func(...)
            if waiting then
                assert(coroutine.resume(_co, ...))
            else
                rets = {...}
            end
        end
        local params = {...}
        table.insert(params, callback_pos or (#params + 1), cb_func)
        async_func(unpack(params))
        if rets == nil then
            waiting = true
            rets = {coroutine.yield()}
        end
        
        return unpack(rets)
    end
end

-- 异步协程
local gameobject = CS.UnityEngine.GameObject('XLua_Coroutine_Runner');
CS.UnityEngine.Object.DontDestroyOnLoad(gameobject);
local csCoroutineRunner = gameobject:AddComponent(typeof(CS.XLuaCoroutineRunner));
local function AsyncYieldReturn(toYield, cb)
    csCoroutineRunner:YieldAndCallback(toYield, cb)
end
local yieldReturn = async_to_sync(AsyncYieldReturn);

-- 协程
local co = coroutine.create(function()
    local url = CS.Common.LoadHelp.GetAssetBundleStreamingUrl("xxx.json");
    local www = CS.UnityEngine.WWW(url);
    yieldReturn(www);
    
    local text = www.text;
    print(text);
end);

coroutine.resume(co);