ios - Cancelled requests take a lot of time for a last new request in queue -

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i've tried lot of approaches , still can't figure out how resolve issue.

i make url request different parameters , show spinner (async request). need cancel previous request , create new one. there 20 cancelled requests , 1 active last.

the last example i've implemented afnetworking:

if connectionmanager.sharedinstance.businessoperation != nil {     connectionmanager.sharedinstance.businessoperation!.cancel() }  let manager = connectionmanager.sharedinstance.businessmanager manager.responseserializer = afjsonresponseserializer() manager.requestserializer = afjsonrequestserializer(writingoptions: .allzeros)  var path = connectionmanager.sharedinstance.path + objectpathcomponent.businesses.rawvalue path = path.stringbyaddingpercentescapesusingencoding(nsutf8stringencoding)!  nslog("start loading")  connectionmanager.sharedinstance.businessoperation = manager.get(path,     parameters: params,     success: { (operation: afhttprequestoperation!, responseobject: anyobject!) -> void in         nslog("loaded")          connectionmanager.sharedinstance.businessoperation = nil          completionhandler(responseobject)     },     failure: { (operation: afhttprequestoperation!, error: nserror!) -> void in         if error.code != nsurlerrorcancelled {             nslog("business request error")             completionhandler(error)         }         else {             nslog("cancelled")         } })

that's logs:

2015-07-09 00:48:49.639 [97349:3984410] start loading 2015-07-09 00:48:50.060 [97349:3984504] loaded 2015-07-09 00:48:52.401 [97349:3984410] start loading 2015-07-09 00:48:52.820 [97349:3984505] loaded 2015-07-09 00:49:58.622 [97349:3984410] start loading 2015-07-09 00:50:03.364 [97349:3985559] loaded 2015-07-09 00:50:05.025 [97349:3984410] start loading 2015-07-09 00:50:05.534 [97349:3984410] start loading 2015-07-09 00:50:05.535 [97349:3985555] cancelled 2015-07-09 00:50:06.068 [97349:3984410] start loading 2015-07-09 00:50:06.069 [97349:3985555] cancelled 2015-07-09 00:50:06.546 [97349:3984410] start loading 2015-07-09 00:50:06.546 [97349:3985822] cancelled 2015-07-09 00:50:07.070 [97349:3984410] start loading 2015-07-09 00:50:07.070 [97349:3985558] cancelled 2015-07-09 00:50:09.366 [97349:3984410] start loading 2015-07-09 00:50:09.366 [97349:3985555] cancelled 2015-07-09 00:50:09.875 [97349:3984410] start loading 2015-07-09 00:50:09.876 [97349:3985559] cancelled 2015-07-09 00:50:10.407 [97349:3984410] start loading 2015-07-09 00:50:10.408 [97349:3985822] cancelled 2015-07-09 00:50:10.874 [97349:3984410] start loading 2015-07-09 00:50:10.875 [97349:3985822] cancelled 2015-07-09 00:50:11.344 [97349:3984410] start loading 2015-07-09 00:50:11.344 [97349:3985822] cancelled 2015-07-09 00:50:11.793 [97349:3984410] start loading 2015-07-09 00:50:11.793 [97349:3985559] cancelled 2015-07-09 00:50:12.297 [97349:3984410] start loading 2015-07-09 00:50:12.297 [97349:3985822] cancelled 2015-07-09 00:50:12.800 [97349:3984410] start loading 2015-07-09 00:50:12.800 [97349:3985822] cancelled 2015-07-09 00:50:13.315 [97349:3984410] start loading 2015-07-09 00:50:13.315 [97349:3984505] cancelled 2015-07-09 00:50:14.047 [97349:3984410] start loading 2015-07-09 00:50:14.048 [97349:3984505] cancelled 2015-07-09 00:50:14.603 [97349:3984410] start loading 2015-07-09 00:50:14.604 [97349:3984505] cancelled 2015-07-09 00:50:15.067 [97349:3984410] start loading 2015-07-09 00:50:15.067 [97349:3984505] cancelled 2015-07-09 00:50:15.601 [97349:3984410] start loading 2015-07-09 00:50:15.601 [97349:3985559] cancelled 2015-07-09 00:50:50.896 [97349:3986273] loaded

if take @ first, there 5 sec max delay between 'start loading' , 'loaded'. when lot of requests cancelled, can more 30 sec , depends on how many requests made.

is there way change priority last request? need complete request fastest can queue, think, not allow me this.

will glad hear ideas.


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