ios - Accessing delegate of NSURLSessionTasks wrapped in static method in separate class -

i wrote separate webservices class app - webservices.m.

in it, have several static methods such setuserinput(), getuserprofile(), registernewuser(), logoutofaccount(). in methods include various nsurlrequests , nsurlsession tasks hit server's endpoints.

i can call these static methods in various viewcontrollers - [webservices registernewuser]. issue is, want following:

1. access response item task
2. go new viewcontroller once task finished

i have been using completion blocks within each completionhandler: assume i'm trying do, need using delegates instead? if so,

• how access delegates if i'm using static methods in other classes?
• how can each delegate differentiate between different tasks calling them?

examples appreciated since i'm pretty new , couldn't find pertinent on stackoverflow.

thank you!

edit:

example of static method in webservices.m completion handler.

+(void)logoutaccount{ // 1 nsurl *url = [nsurl urlwithstring:@"https://mywebsite.com/logout/"]; nsurlsessionconfiguration *sessionconfig = [nsurlsessionconfiguration defaultsessionconfiguration]; sessionconfig.httpadditionalheaders = @{@"authorization": @"token 123456678809203490249019203"}; nsurlsession *session = [nsurlsession sessionwithconfiguration:sessionconfig];  // 2 nsmutableurlrequest *request = [[nsmutableurlrequest alloc] initwithurl:url]; request.httpmethod = @"post";  // 3 nsdictionary *dictionary = @{}; nserror *error = nil; nsdata *data = [nsjsonserialization datawithjsonobject:dictionary                                                options:kniloptions error:&error];  if(!error){     nsurlsessionuploadtask *uploadtask = [session uploadtaskwithrequest:request                                                                fromdata:data completionhandler:^(nsdata *data,nsurlresponse *response,nserror *error) {                                                                    // handle response here                                                                    nshttpurlresponse *httpresponse = (nshttpurlresponse*)response;                                                                    nslog(@"%i",httpresponse.statuscode);                                                                }];      // 5     [uploadtask resume]; } } 

in viewcontroller.m viewdidload() call [webservices logoutaccount]. how access nsurlresponse of completionhandler? should using delegates right? why asking questions above :)

1. completion blocks

as url session programming guide states

note: completion callbacks intended alternative using custom delegate. if create task using method takes completion callback, delegate methods response , data delivery not called.

so, ok go completion blocks in case, however,

issue #1: code not pass callbacks caller (e.g. viewcontroller).

in webservices's header:

typedef void (^webservicescompletionhandler)(id responseobject, nserror *error);  + (void)logoutaccountwithcompletionhandler:(webservicescompletionhandler)completionblock; 

this method, them used

issue #2: use nsurlsessionuploadtask api (log out) should not upload data server. again, don't know server api, rather go nsurlsessiondatatask api.

nsurlsessiondatatask* datatask = [session datataskwithrequest:request completionhandler:^(nsdata * _nullable data,                                                          nsurlresponse * _nullable response,                                                          nserror * _nullable error) {     // process response, data , error } [datatask resume]; 

issue #3: code not call back

// if result api processed ui, pass them in main queue dispatch_async_main(^{     // make sure caller has passed completionblock     if (completionblock) {         completionblock(responseobject, error);     } }); 

so, complete method this:

+ (void)logoutaccountwithcompletionhandler:(webservicescompletionhandler)completionblock {      nsurlsessionconfiguration *sessionconfig = [nsurlsessionconfiguration defaultsessionconfiguration];     sessionconfig.httpadditionalheaders = @{@"authorization": @"token 123456678809203490249019203"};     nsurlsession *session = [nsurlsession sessionwithconfiguration:sessionconfig];      nsurl *url = [nsurl urlwithstring:@"https://mywebsite.com/logout/"];     nsmutableurlrequest *request = [[nsmutableurlrequest alloc] initwithurl:url];     request.httpmethod = @"post";      nsurlsessiondatatask* datatask =     [session datataskwithrequest:request completionhandler:^(nsdata * _nullable data,                                                          nsurlresponse * _nullable response,                                                          nserror * _nullable error) {         dispatch_async_main(^{             // make sure caller has passed completionblock             if (completionblock) {                 completionblock(response, error);             }         });     }];      [datatask resume]; } 

you can use viewcontroller

webservicescompletionhandler completionhandler; completionhandler = ^(id response, nserror* error) {     if (error == nil) {         // process response object     }     else {         // process error     } }; [webservices logoutaccountwithcompletionhandler: completionhandler]; 

2. delegates

using delegates involves more things do, better find complete example, rather post here. now, think ok try out completion blocks solution. let me know.

p.s.: recommend go through several tutorial out there more familiar network communications (e.g. this one)