???????伸?????????????????????????????????????
??????????? 5????????queue???????????operation??????У?????????????isReady????operation???start???????????????????????“??????????????queue.maxConcurrentOperationCount = 1??” ???????????????operation?????????????У????????????????????????????????queue??????????????????У???maxConcurrentOperationCount????Ч?????
??????????? 6???н?????????????????????????isReady??????isPaused???????????????resume?????????????????????????????????????????????飬????????????operation??????????????У?????????queue??????????operation???????У?????????????????????maxConcurrentOperationCount?????????????????????operation??????????????????е?operation????????????????????????????????????start??operation?????????????????????????......
??????????? 7??????????????????????????????operation?????????????????????????????????cancel??????????????isFinished????operation?б???????operation???????“???”??????????????????е???????壡?????????????????????operation???start??????????????????????κ??????:sob:???????????????????????operation????????????????????????????????????????operation??????????......
????????????????????ó???????????????????

???????????ú??????????????????????????????????????Щ??????????????????ó??????????????????????????“???”??
????????????NSOperationQueue?????ж??????????????????
???????????￡?
?????????????????“?????ж????????????????????????”?????????????????????????????????????????NSOperationQueue?????operation?????????????????????????????????????????start?????operation?????????????????????????????????????????????а?????????operation???isReady????????????isReady????operation???????δ????queue????????????δ?????У????????????У?????????isReady?????????????????????operation??????????????????????????????????operation??????а?????????????????????????????
????????????????????????????????????????????????????????????????????????????????????????????????????????operation???????Э???queue?б????????????????????????????????????UI??????????????????BOSS??????????????????????????????operation?????queue?У?????????????operation?嵽??β???б?????????????????????????operationQueue.operations???????????????????????
????......?????????????????????????2??????????????????????
?????????????????????????÷???NSOperationQueue????ù??????????--NSMutableArray?????ж?????????????????????????operation????????????????????????????????С???????????????Щ????????????????operation?????????????????????????е??????????????????????????????????????????????????
?????????AFHTTPRequestOperation???????????????????
??????isReady????operation???resume??pause??cancel???????????κ????????????????????????????operation???resume??pause??cancel?????????????[operation start]?????????start????operation???start????????κ????
?????????isPaused??operation???cancel???????????????????????????????cancel??????????????????[operation resume]?? (?????????????isExecuting????operation????????resume??????????????κ?????)
??????????????????????????????????????????????????????????????????????￡?
????a.  AFHTTPRequestOperation??NSMutableArray??Щ????????????????????app????Щ????????????????????????????????????????????????????????NO??????????????
????b.  ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????ж????????????????????????????????Щ????????????????δ??????????????????app????????????????????????????????????????????????
????c.  ?????operationQueue???????????????operation???????е????isReady???????????н?operation?趨?paused????????????????????isReady?????????????????CoreData???б???????洢??
????d.  ......??operation?????????????????????????????к?????????????????????????к??????????????????????
?????????????????????????????????????????????????λ????????и??????????????????????????????????stream????????????????????????????????????????á????????????????????