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 + ), 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);