Question

I am working on adding some functionality to an app that is very similar to the app switching drawer on Springboard on iOS. I want to be able to have a button that I can hit that will animate the y-coordinates of the view up so that another view is exposed at the bottom. Like I said, very similar to the home button double-tap feature on iOS.

After doing some looking around, it appears that I need to wrap both of the sub view controllers into one parent view controller.

How can I go about doing this? The existing view controller is pretty complicated so I am having a hard time figuring out where to start.

Answer 1

I don’t know that you need to use a parent view controller to do this. This code worked for me to do what I think you want. I have one BOOL ivar to keep track of whether the bottom view has been revealed, and use the same button in the main view to toggle between the two states.

-(IBAction)slideInController:(UIButton *) sender {
    if (viewRevealed == NO) {
        next = [self.storyboard instantiateViewControllerWithIdentifier:@"Blue"];
        next.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + self.view.frame.size.height, self.view.frame.size.width, 100); // my NextController's view was made 100 points high in IB.
        [self.view.window addSubview:next.view];
        [UIView animateWithDuration:.6 animations:^{
            self.view.center = CGPointMake(self.view.center.x, self.view.center.y - 100);
            next.view.center = CGPointMake(next.view.center.x, next.view.center.y - 100);
        } completion:^(BOOL finished) {
            viewRevealed = YES;
        }];
    }else{
        [UIView animateWithDuration:.6 animations:^{
            self.view.center = CGPointMake(self.view.center.x, self.view.center.y + 100);
            next.view.center = CGPointMake(next.view.center.x, next.view.center.y + 100);
        } completion:^(BOOL finished) {
            [next.view removeFromSuperview];
            viewRevealed = NO;
        }];
    }
}

I usually do use container view controllers to do this kind of thing, but this works, and is very simple.