ios - UIView transitionWithView not working first time only -


i'm making slideshow using uiimageview , nstimer. working fine except first time when transitionwithview method called, animation doesn't happen, changes image without cross-dissolve, , after that, cross dissolve works @ every image change.

please can find error in code:

-(void) startslideshow {  nsurl *imageurl = [nsurl urlwithstring:[self.arrimagelinks objectatindex:currentimage]];  [uiview transitionwithview:self.imageview                       duration:1.0f                        options:uiviewanimationoptiontransitioncrossdissolve                     animations:^{                          [manager downloadimagewithurl:imageurl                                               options:0                                              progress:^(nsinteger receivedsize, nsinteger expectedsize) {                                               }                                             completed:^(uiimage *image, nserror *error, sdimagecachetype cachetype, bool finished, nsurl *imageurl) {                                                 if (image) {                                                      [self.imageview setimage:image];                                                 }                                             }];                     } completion:nil];  timer = [nstimer timerwithtimeinterval:6.0 target:self selector:@selector(handletimer:) userinfo:nil repeats:yes];  [[nsrunloop mainrunloop] addtimer:timer formode:nsdefaultrunloopmode];  }

here's handletimer code :

- (void) handletimer: (nstimer *) timer {      currentimage++;     if ( currentimage >= self.arrimagelinks.count )         currentimage = 0;       nsurl *imageurl = [nsurl urlwithstring:[self.arrimagelinks objectatindex:currentimage]];   [uiview transitionwithview:self.imageview                           duration:1.0f                            options:uiviewanimationoptiontransitioncrossdissolve                         animations:^{                              [manager downloadimagewithurl:imageurl                                                   options:0                                                  progress:^(nsinteger receivedsize, nsinteger expectedsize) {                                                   }                                                 completed:^(uiimage *image, nserror *error, sdimagecachetype cachetype, bool finished, nsurl *imageurl) {                                                     if (image) {                                                          [self.imageview setimage:image];                                                     }                                                 }];                         } completion:nil];  }


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