StackController

A vertically scrolling container view controller written in Swift.

Usage

Preferred Content Size

The only requirement when using a stack controller is that you keep your view controller's preferredContentSize up-to-date. Typically, the value of the preferredContentSize property is used when displaying a view controller's content in a popover. However, container controllers also use this property to layout their child view controllers.

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    preferredContentSize = tableView.rectForSection(0).size
}

It's best to update preferredContentSize in viewDidAppear: to allow the view controller to fully layout its subviews.

Supporting Rotation

A stack controller will immediately respond to any changes in its child view controller's preferredContentSize.

private func updateContentSize() {
    preferredContentSize = collectionView!.contentSize
}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    updateContentSize()
}

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
    coordinator.animateAlongsideTransition(nil) { [unowned self] context in
        self.updateContentSize()
    }
}

Known Issues

When using a UITableView or UICollectionView in a stack controller they will not benefit from cell reuse. The stack controller's scroll view does not forward its content offset to any subviews. It simply "wastes" memory by drawing all the cells so be sure to limit your cell count and monitor memory usage. For more information, read Ole Begemann's post, Scroll Views Inside Scroll Views.

Installation

To integrate StackController into your Xcode project using Carthage, add it to your Cartfile:

github "bfahey/StackController"