MTMultipleViewController

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MTMultipleViewController

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A container view controller that allows the selection of child views based on a UISegmentedControl in the navigation bar

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# MTMultipleViewController

`MTMultipleViewController` is a container view controller that allows the
selection of child views based on a `UISegmentedControl` in the navigation bar.

It does some cool things:

* The navigation bar all of its properties (`leftBarButtonItem`, `rightBarButtonItem`, etc) from the currently selected child `UIViewController`
* Titles for the segmented control are taken from the child view controllers' `navigationItem.title` properties
* Your child view controllers don't require any modification to be used with this container
* Because `MTMultipleViewController` uses proper container view controller APIs, all relevant rotation, memory, and view lifecycle messages automatically get passed through to the selected child

It should be said that generally, the HIGs dictate that segmented controls in the
title of a view (such as `MTMultipleViewController` displays) are intended to
select between different filters views into a single set of data (for example, see
the 'Recents' tab in Phone.app, or the 'Connect' tab in the official
Twitter.app). Such filtered views are quite easy to do using a single
`UITableViewController` subclass, and if you're using `MTMultipleViewController` to
realize such a design you're quite possibly doing it wrong. On the other end of
the spectrum, using `MTMultipleViewController` to toggle between two or more
obviously different view controllers is an equally bad idea; where
`MTMultipleViewController` shines is in the grey area in between these two
extremes. There should be a natural and complementary relationship between the
data presented by views embedded within an `MTMultipleViewController`; the data in 
each of the child views should be thematically similar to one another so as to 
make sense to the user, but different enough so as to require separate view 
controllers. If that describes your use case, then `MTMultipleViewController` may 
well be for you.

## Supported Platforms

iOS 5.0 is a minimum; any release since then is supported. ARC is required (if you have a need
for this project to not require ARC, let me know and I'll fix you up;
I just haven't has a need for it yet).

## Usage

Using `MTMultipleViewController` is easy. Initialization looks very similar to
that of any of the system view controllers:

```

UIViewController *controllerOne = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain];
controllerOne.navigationItem.title = @"One";
controllerOne.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCompose target:nil action:nil];;

UIViewController *controllerTwo = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain];
controllerTwo.navigationItem.title = @"Two";
controllerTwo.navigationItem.prompt = @"Controller two's prompt";

MTMultipleViewController *multipleViewController = [[MTMultipleViewController alloc] initWithChildViewControllers:@[controllerOne, controllerTwo]];
/* add multipleViewController into your view controller hierarchy anywhere you'd like */

```

The previous code will give you something that looks like this:

![Controller One](http://mat.geeky.net/static/MTMultipleViewControllerOne.png)
![Controller Two](http://mat.geeky.net/static/MTMultipleViewControllerTwo.png)

You can have any number of child view controllers, but I'd try very hard not to 
exceed three (or two if you have left and right bar button items). Transitions 
between child view controllers aren't animated (except in the case of views controllers with `prompt`s), which
sounds weak, but is actually what you want in this situation.

Note that the `UIBarButtonItem` and `prompt` added above are purely fictional and
would never be done like this in real code. The above only serves to demonstrate
what the UI looks like.

The relevant hooks are also in place to allow the placement of `MTMultipleViewController`
instances in nib/storyboard files (though you still have to insert child views 
programmatically; as with all non-system view containers).

## Contributing

Contributions welcome! Fork this repo and submit a pull request (or just open up
a ticket and I'll see what I can do).

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