completion block of uiview animate never called if view disappear

i noticed some strange behavior. When i start a animation and change the View (the view will not dismissed!), the completion handler never get called.

[UIView animateWithDuration:0.1f 
                          delay:0.0f 
                        options:UIViewAnimationCurveEaseOut 
                     animations:^(void){
                         [myView setHidden:YES];
                         myLabel.alpha = 0.0f;
                         someOtherView.frame = CGRectMake(130, bubbleBigRect.origin.y, 61, 65);
                         [button setHidden:YES];
                     } 
                     completion:^(BOOL finished){
                         NSLog(@"Complete %d",finished);
                         [imageVIew setImage:[UIImage imageNamed:@"myPng.png"]];                    
                     }];
}

is there any solution for this?