为什么在case1中，我的函数返回["reachedend":"reachedend"]而不是响应字典的值？如何让它返回responseDictionary的值？背景:HelperClass.doMath接受一个数字并有一个返回字典的完成blockfunchandleTask(task:[String:AnyObject])->AnyObject{switchtask{case1:ifletbigNumber=task[bigNumberKey]as?NSNumber{HelperClass.doMath(bigNumber,replyBlock:{(responseDictionar