ios - transitionFromViewController view not appearing -


i have following code replace 1 view in container view corresponding container view controller. copied apple documentation.

edit: apple documentation creating custom container view controllers

- (void)transitiontoviewcontroller:(uiviewcontroller*)toviewcontroller {     toviewcontroller.view.autoresizingmask = uiviewautoresizingflexiblewidth | uiviewautoresizingflexibleheight;      [self.childviewcontroller willmovetoparentviewcontroller:nil];      [self addchildviewcontroller:toviewcontroller];     // [self.view addsubview:toviewcontroller.view];       toviewcontroller.view.frame = cgrectoffset(self.view.bounds, self.view.frame.size.width, 0);      [self transitionfromviewcontroller:self.childviewcontroller                       toviewcontroller:toviewcontroller                               duration:0.5                                options:0                             animations:^{                                 toviewcontroller.view.frame = self.view.bounds;                             }                             completion: ^(bool finished) {                                 nslog(@"finished: %d", finished);                                 [self.childviewcontroller removefromparentviewcontroller];                                 [toviewcontroller didmovetoparentviewcontroller:self];                                  self.childviewcontroller = toviewcontroller;                             }];  }

when executed, toviewcontroller.view not appear. however, viewwillappear , viewdidappear getting called in toviewcontroller.view. in completion block, value of finished false. not working correctly.

i know transitionfromviewcontroller add toviewcontroller.view view hierarchy. if uncomment line addsubview manually adding it, view appear, appearance methods on view getting called multiple times. , in case finished value in completion block true.

welcomeviewcontroller viewwillappear welcomeviewcontroller viewwillappear welcomeviewcontroller viewdidappear finished: 1 welcomeviewcontroller viewdidappear

i'm pretty sure should not manually adding view view hierarchy based on several other examples. why isn't working?

turned out code above correct , problem elsewhere. problem first time through transition, self.childviewcontroller.view not in view hierarchy. self.childviewcontroller in view controller hierarchy view not.


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