multiple ViewControllers (containerView? childView? instance of viewController?)

Question

I need to have a new view(w/ ViewController) added over the top of another. The user interacts with this new view for a while, and then I want to remove it. In an older version of Xcode I was able to add it as a subview. I now get an EXC_BAD_ACCESS error.

I don't want the added view as a modal. I need to see the original background through the added view. I've read a lot about the new custom containerViews, addChildView, & presentView. I can't see that any of these are the clear answer.

Here's the old code that worked before - Action in the main ViewController:

-(IBAction)showWhiteView:(id)sender
{
    WhiteViewController *whiteView = [[WhiteViewController alloc] initWithNibName:@"WhiteViewController" bundle:nil];
    [self.view addSubview:whiteView.view];
}

Action in the added view to remove it:

-(IBAction)removeView:(id)sender
{
    [self.view removeFromSuperview];
}

Thanks for your help.

Maybe a VISUAL EXAMPLE will help explain - Let's say the main view is an ocean, with animated waves and clouds moving controlled by MainView Controller. The user taps something and a I want to add a boat(WhiteView) to the main view. I want the user to interact with boat: tap here the sail opens, tap there the anchor drops, etc. (needing the methods of the WhiteViewController) Eventually I want to remove the boat from the ocean.

Thanks Tim - New code added:

-(IBAction)showWhiteView:(id)sender
{   WhiteViewController *whiteView = [[WhiteViewController alloc] initWithNibName:@"WhiteViewController" bundle:nil];
    [self addChildViewController:whiteView];
    [whiteView didMoveToParentViewController:self];
    [self.view addSubview:whiteView.view];   }

and within the WhiteViewController to remove:

-(IBAction)removeView:(id)sender
{    [self.view removeFromSuperview];
     [self removeFromParentViewController];    }

I look forward to any further suggestions on making this better. Thanks all!

you can not remove the base view or parent view. you can add your child view upon a parent view. so if you remove parent view you get the EXE_BAD error — Hiren, Mar 27 '12 at 05:37

score 5 · Accepted Answer · edited May 23 '17 at 12:21

5

See the answer here concerning UIViewController containment. I put together an example project on UIViewController containment here: http://github.com/toolmanGitHub/stackedViewControllers

Hope this helps.``

Tim

edited May 23 '17 at 12:21

Community

1
1

answered Mar 27 '12 at 08:11

timthetoolman

4,613
1
22
22

Thanks Tim! Looking at your example lead me to a solution. I was only adding the view & not its controller. So I added to the original code. see above. – Scott Mar 27 '12 at 18:30
Tim, I have a related problem. I'm trying to have my child view controller message the parent. I've tried an adaptation of your "[(ViewController *)self.parentViewController swapViewControllers];" from your example code. It keeps telling me "No visible @interface for 'UIViewController' declares the selector 'myMethod'" I've imported the parent viewcontroller. Any suggestions? – Scott Mar 31 '12 at 20:18
@Scott make sure the .h file for your parent view controller contains the declaration of 'myMethod'. And then also make sure the (ViewController *) is in fact the parent view controller name that you are importing. – timthetoolman Mar 31 '12 at 20:37
That's it. Once again you saved the day. Thank you! – Scott Apr 01 '12 at 21:16

score 1 · Answer 2 · edited Mar 27 '12 at 10:30

what I understood from your question is, that you want to add a subview to a superview, and which must be user interactable right?

so you can do it by following steps.

1) Add a new view to the xib.
2) make it opaque, set is alpha to less than one(but not zero, depends on you, how much trasparancy u want)
3) add the componats over it, and inside -(IBAction)showWhiteView:(id)sender (in your case) the following code

whiteView.frame = CGRectMake(55, 60, 200, 200);
[UIView beginAnimations:@"" context:nil];
[UIView setAnimationDuration:.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:YES];
[self.view addSubview:whiteView];

And to remove it do the following

-(IBAction)removeView:(id)sender
  {
     [whiteView removeFromSuperview];
  }

Dont forget to connect the newly added view.

try it out.

I'm not sure that is the key. It's really about bringing the methods in the ViewController in the added Subview. — Scott, Mar 27 '12 at 07:54

multiple ViewControllers (containerView? childView? instance of viewController?)

2 Answers2

Linked