This is an easy to integrate view controller that allows a UIScrollView or any of their widely used subclasses (such as UITableView and UICollectionView) to have a header view that can be animated along with scrolling.

Here an example:

OLSDynamicHeaderViewController is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "OLSDynamicHeaderViewController"

• Make your UIViewController to inherit either one of the helpers OLSDynamicHeaderTableViewController or OLSDynamicHeaderCollectionViewController

class MyViewController: OLSDynamicHeaderTableViewController {

    // MARK - OLSDynamicHeaderViewControllerProtocol
    override func headerViewInstance() -> OLSDynamicHeaderView {
        ...
    }
    
    // ... (View Controller lifecycle and logic)
    

• On headerViewInstance() return an instance of OLSDynamicHeaderView subclass. This class is a basic UIView subclass that conforms the protocol that will help you with the animation part =D.

• Create a subclasss of OLSDynamicHeaderView, and implement the protocol:

class MyDynamicHeader: OLSDynamicHeaderView {

    func maxHeight() -> CGFloat { ... }

    func minHeight() -> CGFloat { ... }

    func resize(withProgress progress: CGFloat) { ... }

    func overflow(withPoints points: CGFloat)  { ... }
}

• maxHeight returns the maximum height allowed for this view.
• minHeight returns the minimum height allowed for this view.
• resize(withProgress) will be called when the user scrolls and your header needs to animate. progress goes from 0 to 1, 0 min height reached, 1 max height reached.
• overflow(withPoints) will be called when the user scrolls further the max height. points goes from 0 to N.

• The project includes a basic sample code you can use as a guidence to integrate the component in your app.
• The project provides helper subclasses for tableView and collectionView, and the example above takes advantage of those classes. But you can go a step under and inherit from OLSDynamicHeaderViewController and move from there to have additional control.
• If you have questions, improvements, ideas or just comments, see to the links below!

Omar Hagopian, Antihero @OrangeLoops

Contact:

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OLSDynamicHeaderViewController is under the MIT license. See the LICENSE file for more info!