An NSSplitView subclass that provides a method to animate the position of a divider in a way that works with Auto Layout.

MDPSplitView adds a single method: setPosition:ofDividerAtIndex:animated:. This mirrors NSSplitView’s setPosition:ofDividerAtIndex:, but adds an option to animate the position.

In order to implement a minimum-width collapsing behavior, you’ll need to manually add and remove your width constraint when you move the divider. See the included demo project for an example.

To add MDPSplitView to your project:

1. Add the repository as a submodule (git submodule add https://github.com/mdiep/MDPSplitView [<path>]).
2. Add MDPSplitView.framework to your project in Xcode.
3. Add MDPSplitView.framework to the Link Binary With Libraries section of your target’s Build Phases.
4. Add MDPSplitView.framework to a Copy Files build phase that copies into the Frameworks directory.

Or you can use Carthage.

This wouldn’t be possible without the help of @robrix. ✨

Available under the MIT License.