Awesome

<a href="https://www.ramotion.com/agency/app-development/?utm_source=gthb&utm_medium=repo&utm_campaign=expanding-collection"><img src="https://github.com/Ramotion/folding-cell/blob/master/header.png"></a>

Requirements

• iOS 9.0+
• Xcode 9.0+

Installation

Just add the Source folder to your project.

or use CocoaPods with Podfile:

pod 'expanding-collection'

or Carthage users can simply add to their Cartfile:

github "Ramotion/expanding-collection"

Usage

import expanding_collection

Create CollectionViewCell

1. Create UICollectionViewCell inherit from BasePageCollectionCell (recommend create cell with xib file)

2. Adding FrontView

• add a view to YOURCELL.xib and connect it to @IBOutlet weak var frontContainerView: UIView!
• add width, height, centerX and centerY constraints (width and height constranints must equal cellSize)

• connect centerY constraint to @IBOutlet weak var frontConstraintY: NSLayoutConstraint!
• add any desired uiviews to frontView

3. Adding BackView

• repeat step 2 (connect outlets to @IBOutlet weak var backContainerView: UIView!, @IBOutlet weak var backConstraintY: NSLayoutConstraint!)

4. Cell example DemoCell

If set tag = 101 for any FrontView.subviews this view will be hidden during the transition animation

Create CollectionViewController

1. Create a UIViewController inheriting from ExpandingViewController

2. Register Cell and set Cell size:

override func viewDidLoad() {
    itemSize = CGSize(width: 214, height: 460) //IMPORTANT!!! Height of open state cell
    super.viewDidLoad()

    // register cell
    let nib = UINib(nibName: "NibName", bundle: nil)
    collectionView?.registerNib(nib, forCellWithReuseIdentifier: "CellIdentifier")
}

3. Add UICollectionViewDataSource methods

extension YourViewController {

  override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return items.count
  }

  override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CellIdentifier"), forIndexPath: indexPath)
    // configure cell
    return cell
  }
}

4. Open Cell animation

override func viewDidLoad() {
    itemSize = CGSize(width: 214, height: 264)
    super.viewDidLoad()

    // register cell
    let nib = UINib(nibName: "CellIdentifier", bundle: nil)
    collectionView?.registerNib(nib, forCellWithReuseIdentifier: String(DemoCollectionViewCell))
}

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    cell.cellIsOpen(!cell.isOpened)
}

if you use this delegates method:

func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath)

func scrollViewDidEndDecelerating(scrollView: UIScrollView)

must call super method:

func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) {
  super.collectionView(collectionView: collectionView, willDisplayCell cell: cell, forItemAtIndexPath indexPath: indexPath)
  // code
}

func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
  super.scrollViewDidEndDecelerating(scrollView: scrollView)
  // code
}

Transition animation

1. Create a UITableViewController inheriting from ExpandingTableViewController

2. Set header height default 236

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    headerHeight = ***
}

OR

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    headerHeight = ***
}

3. Call the push method in YourViewController to YourTableViewController

  if cell.isOpened == true {
    let vc: YourTableViewController = // ... create view controller  
    pushToViewController(vc)
  }

4. For back transition use popTransitionAnimation()

🗂 Check this library on other language:

📄 License

Expanding Collection is released under the MIT license. See LICENSE for details.

This library is a part of a <a href="https://github.com/Ramotion/swift-ui-animation-components-and-libraries"><b>selection of our best UI open-source projects.</b></a>

If you use the open-source library in your project, please make sure to credit and backlink to www.ramotion.com

📱 Get the Showroom App for iOS to give it a try

Try this UI component and more like this in our iOS app. Contact us if interested.