MSNavigationPaneViewController was written by Eric Horacek for Monospace Ltd.

MSNavigationPaneViewController is a container view controller that handles the presentation of two overlaid child view controllers. The "pane" view can moved with a swipe gesture to reveal the "master" view below. This interface paradigm easily enables the navigation seen in Facebook, Path, and many others.

There are a number of great reasons to use MSNavigationPaneViewController over of the many other similar overlaid view controller classes:

• Simplicity – This class was written with an emphasis on simplicity. Its interface is about as simple as they come, and is easy to extend.
• Pane Swiping – You can swipe the pane to reveal the master view, and there's a nice bounce animation when the navigation pane finishes sliding.
• Styling – There are various appearance types, animations, and open directions available to customize the visual style.
• Easy Integration – It doesn't require for you to subclass your pane or master view controllers to add them as child view controllers.
• Animations – When a new pane view controller is set using the setPaneViewController:animated:completion: method, it is first animated off to the right, replaced, and then animated back to the left. This prevents a jarring "pop-in" effect when a new pane view controller replaces the current view.
• Containment APIs – It uses the UIViewController containment APIs introduced in iOS 5, so you can rest assured that there's no hackiness going on to get nice overlaid view controllers.

To really get a good feel for it, you should run the MSNavigationPaneViewController example on device—otherwise it's difficult to get a decent idea of how the swiping gestures are implemented.

Two examples for MSNavigationPaneViewController are included in the "Example" directory within Examples.xcworkspace:

• Example.xcodeproj – No Storyboards or Nibs
• Storyboard Example.xcodeproj – Use with Storyboards

The example projects depend on PRTween, which is included as a git submodule. To install, run the following:

$ git submodule init
$ git submodule update

• Left (MSNavigationPaneOpenDirectionLeft) – Default open direction. The navigation pane opens from the left. A left-right swipe can also reveal the master view.

• Top (MSNavigationPaneOpenDirectionTop) – The navigation pane opens from the top. A top-bottom swipe can also reveal the master view.

There are a few types of appearance available for MSNavigationPaneViewController. They each change some aspect of the visual style of the pane view dragging. The appearance type of the navigation pane is set via the appearanceType property. The possible types are as follows:

• Parallax (MSNavigationPaneAppearanceTypeParallax) – Scrolls the master view in from the right as the pane view is dragged.
• Zoom (MSNavigationPaneAppearanceTypeZoom) – Zooms the master view in from an inset state as the pane view is dragged.
• Fade (MSNavigationPaneAppearanceTypeFade) – Fades the master view from an alpha of 1.0 to 0.0 as the pane view is dragged.

To change the distance that the pane view snaps open to, set:

navigationPaneViewController.openStateRevealWidth = 100.0; // Or whatever width you'd like.

To forward touches through views that require a swipe/pan gesture so that the MSNavigationPaneViewController doesn't intercept them, simply add their Class to touchForwardingClasses:

[navigationPaneViewController.touchForwardingClasses addObject:UISwitch.class];

Both UISlider and UISwitch are included by default.

To disable dragging of the pane and prevent MSNavigationPaneViewController from intercepting touches, set

navigationPaneViewController.draggingEnabled = NO;

Requires iOS 5.0, ARC, and the QuartzCore Framework.

Forks, patches and other feedback are welcome.

Copyright (c) 2012-2013 Monospace Ltd. All rights reserved.

This code is distributed under the terms and conditions of the MIT license.

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