objective c - iOS: change view from viewDidAppear -

i'm playing around view life cycles & having trouble changing view load of different view.

in viewcontroller.h have:

-(void)viewdidappear:(bool)animated{     uistoryboard *storyboard = [uistoryboard storyboardwithname:@"main" bundle:nil];     viewcontroller2 *viewcontroller = (viewcontroller2 *)[storyboard instantiateviewcontrollerwithidentifier:@"viewcontroller2"];     [self presentviewcontroller:viewcontroller animated:yes completion:nil]; } 

however causes view between viewcontroller, , viewcontroller2 appearing animation (in loop).

i used code in viewdidload neither of view's loaded (from reading cannot change view until viewwillappear)

update: when using code in viewwillappear, whose view not in window hierarchy error thrown.

how 1 change view view setup stage?

update using above code, inside & out of gcd, in viewdidload, viewwillappear & viewdidappear either results in infinite loop of animated showing of viewcontroller2, or crash on 2nd attempt of segue (result loop).

edited:

i'm not sure you're trying do, assuming wanting first viewcontroller appear , second viewcontroller animate on top of first one, should able accomplish using several options:

first wrap calls in dispatch_async call:

dispatch_async(dispatch_get_main_queue(), ^{      uistoryboard *storyboard = [uistoryboard storyboardwithname:@"main" bundle:nil];     viewcontroller2 *viewcontroller = (viewcontroller2 *)[storyboard      instantiateviewcontrollerwithidentifier:@"viewcontroller2"];      [self presentviewcontroller:viewcontroller animated:yes completion:nil]; }); 

or use show modally segue:

- (void)viewdidload {   [super viewdidload];    dispatch_async(dispatch_get_main_queue(), ^{          [self performseguewithidentifier:@"mymodalsegue" sender:self];   }); } 

or use navigation controller , use standard show segue (formally push). 1 doesn't require dispatch_async:

- (void)viewdidload {   [super viewdidload];    [self performseguewithidentifier:@"myshowsegue" sender:self]; } 

i've posted working examples of 3 on: github