display subviews with delay - iphone

Question

When this action gets executed it displays secondviewcontroller directly what i want is that viewcontroller displays first and after 40 or 50 secs it displays secondviewcontroller next and so on.
- (void)displayviewsAction:(id)sender
{
PageOneViewController *viewController = [[PageOneViewController alloc] init];
viewController.view.frame = CGRectMake(0, 0, 320, 480);
SecondViewController *secondController = [[SecondViewController alloc] init];
secondController.view.frame = CGRectMake(0, 0, 320, 480);
[self.view addSubview:viewController.view];
[self.view addSubview:secondController.view];
[self.view bringSubviewToFront:viewController.view];
[self.view addSubview:toolbar];
[self.view sendSubviewToBack:viewController.view];
[self.view addSubview:toolbar];
}
Anyone have any ideas how i can do that.

Answer 1

Try making the view invisible and then quickly fading it in after 40 seconds have passed.
secondController.view.alpha = 0.0;
[self.view addSubview:secondController.view];
[UIView animateWithDuration:0.5
delay:40
options:UIViewAnimationCurveEaseInOut
animations:^{
secondController.view.alpha = 1.0;
}
completion:NULL
];

Answer 2

you can add the secondViewController in a separate method and call that method using performSelector:withObject:afterDelay
- (void)displayviewsAction:(id)sender {
PageOneViewController *viewController = [[PageOneViewController alloc] init];
viewController.view.frame = CGRectMake(0, 0, 320, 480);
[self.view addSubview:viewController.view];
[self performSelector:#selector(secondViewController) withObject:nil afterDelay:40];
}
-(void)secondViewController {
SecondViewController *secondController = [[SecondViewController alloc] init];
secondController.view.frame = CGRectMake(0, 0, 320, 480);
[self.view addSubview:secondController.view];
}

Answer 3

An alternative/addition to the method detailed by Aravindhanarviless is to use an NSTimer:
self.myTimer = [NSTimer scheduledTimerWithTimeInterval:40 target:self selector:#selector(showSecondViewController) userInfo:nil repeats:NO];