objective c - NSURLSession uploadTaskWithRequest - use block within completion handler -

-

i have class manages calls api. has method manage this, lets call callapimethod:

this method accepts success , fail block.

inside method, call uploadtaskwithrequest make call api. within uploadtaskwithrequest completion handler i'd (depending on result) pass results through either success or fail blocks.

i'm having issues this. works , keeping super tidy when call callapimethod using success/fail blocks it's locking ui/mainthread rather being asynchronous i'd expect.

how should go implementing pattern? or there better way go it?

i don't need support pre-ios7.

thanks

edit: basic implementation discussed above.

- (void)callapimethod:(nsstring *)method withdata:(nsstring *)requestdata as:(krequesttype)requesttype success:(void (^)(id responsedata))success failure:(void (^)(nsstring *errordescription))failure {     [redacted]     nsurlsession *session = [nsurlsession sharedsession];     nsurlsessiondatatask *task = [session uploadtaskwithrequest:request                                                        fromdata:postdata                                               completionhandler:                                   ^(nsdata *data, nsurlresponse *response, nserror *error) {                                       if (error) {                                           failure(error.description);                                       } else {                                           nserror *jsonerror;                                           id responsedata = [nsjsonserialization                                                              jsonobjectwithdata:data                                                              options:kniloptions                                                              error:&jsonerror];                                           if (jsonerror) {                                               failure(jsonerror.description);                                           } else {                                               success(responsedata);                                           }                                       }                                   }];      [task resume]; }

callapi method, used follows (from uitableviewcontroller):

[apicontroller callapimethod:@"users.json?action=token"                     withdata:logindata                           as:krequestpost                      success:^(id responsedata) {                          if ([responsedata iskindofclass:[nsdictionary class]]) {                              if ([responsedata objectforkey:@"token"]) {                                  //store token/credentials                              } else if ([responsedata objectforkey:@"error"]) {                                  //error                                  [self displayerrormessage:[responsedata objectforkey:@"error"]];                                  return;                              } else {                                  //undefined error                                  [self displayerrormessage:nil];                                  return;                              }                          } else {                              //error                              [self displayerrormessage:nil];                              return;                          }                           //if login success                       }                      failure:^(nsstring *errordescription) {                          [self displayerrormessage:errordescription];                      }];

your nsurlsession code looks fine. i'd suggest adding breakpoints can identify if deadlocking somewhere , if so, where. nothing in code sample suggest such problem.

i suggest ensure ui calls dispatched main queue. nsurlsessionuploadtask completion handler may called on background queue, ui updates (alerts, navigation, updating of uiview controls, etc.) must take place on main queue.


Comments

Post a Comment

Popular posts from this blog

c# - Unity IoC Lifetime per HttpRequest for UserStore -

-
i'm trying clean default implementation of accountcontroller.cs comes out of box in new mvc5/owin security implementation. have modified constructor this: private usermanager<applicationuser> usermanager; public accountcontroller(usermanager<applicationuser> usermanager) { this.usermanager = usermanager; } also, have created lifetime manager unity looks this: public class httpcontextlifetimemanager<t> : lifetimemanager, idisposable { private httpcontextbase _context = null; public httpcontextlifetimemanager() { _context = new httpcontextwrapper(httpcontext.current); } public httpcontextlifetimemanager(httpcontextbase context) { if (context == null) throw new argumentnullexception("context"); _context = context; } public void dispose() { this.removevalue(); } public override object get...
Read more

Change the color of an oval at click in Java AWT -

-
i have draw ovals in java, , @ click change color. beginning tried change color after 20 ms, doesn't work. my code is: public class mycomponentnew extends frame { public graphics2d g2d; public mycomponentnew(string title) { super(title); setsize(400, 550); } @override public void paint(graphics g) { this.g2d = (graphics2d) g; this.g2d.setcolor(color.red); this.g2d.filloval(10, 55, 50, 100); } public void changecolor () { this.g2d.setcolor(color.blue); this.g2d.filloval(10, 55, 50, 100); } } and in class main method have: mycomponentnew m; m = new mycomponentnew("fereastra cu baloane"); m.setvisible(true); m.addwindowlistener(new windowadapter() { @override public void windowclosing(windowevent we) { system.exit(0); } }); try { thread.sleep(20); } catch(interruptedexception e) {} m.changecolor(); the color of oval remains red. ...
Read more

I am trying to solve the error message 'incompatible ranks 0 and 1 in assignment' in a fortran 95 program. -

-
i writing program in fortran find velocity of parachuting person in relation time. keep getting error can't fix. new programming , appreciated. the error is v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) 1 error: incompatible ranks 0 , 1 in assignment @ (1) and program is program para integer :: real :: v(11) !velocity real :: q !initial velocity real :: h !time step real :: c !drag coefficient real :: m !mass ! gravity equal 32 ft/s^2 write (*,*)'enter time step' read(*,*)h write(*,*)'enter initial velocity' read(*,*)q write(*,*)'enter drag coefficient' read(*,*)c write(*,*)'enter mass' read(*,*)m i=1,10 ! 1 10, 1 being interval. end v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) q=v(1) end program you cannot use [] normal parenthesis in expressions. array constructor, [ items ] means array items elements. end do should after line.
Read more