Latest 0.4.0
Homepage https://github.com/toshi0383/HorizontalStickyHeaderLayout
License MIT
Platforms ios 9.0, tvos 9.0
Authors

Horizontal UICollectionViewLayout with Sticky HeaderView

HorizontalStickyHeaderLayout

platforms
Carthage compatible
Cocoapods
pod
License

Requirements

  • iOS9+
  • tvOS9+

How to use

Just implement these 5 required delegate methods.

extension ViewController: HorizontalStickyHeaderLayoutDelegate {
    private enum Const {
        static let headerSize = CGSize(width: 100, height: 38)
        static let itemSize0  = CGSize(width: 50, height: 50)
        static let itemSize1  = CGSize(width: 80, height: 80)
        static let headerLeft: CGFloat = 8
    }
    func collectionView(_ collectionView: UICollectionView, hshlSizeForItemAtIndexPath indexPath: IndexPath) -> CGSize {
        if indexPath.section % 2 == 0 {
            return Const.itemSize0
        } else {
            return Const.itemSize1
        }
    }
    func collectionView(_ collectionView: UICollectionView, hshlSizeForHeaderAtSection section: Int) -> CGSize {
        return Const.headerSize
    }
    func collectionView(_ collectionView: UICollectionView, hshlHeaderInsetsAtSection section: Int) -> UIEdgeInsets {
        return UIEdgeInsets(top: 0, left: Const.headerLeft, bottom: 20, right: 20)
    }
    func collectionView(_ collectionView: UICollectionView, hshlMinSpacingForCellsAtSection section: Int) -> CGFloat {
        return 20
    }
    func collectionView(_ collectionView: UICollectionView, hshlSectionInsetsAtSection section: Int) -> UIEdgeInsets {
        return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: section == 4 ? 0 : 20)
    }
}

Optionally you can define contentInset for outer margin.

HorizontalStickyHeaderLayout

See Example for detail.

Animated header Y position for tvOS for free!

HorizontalStickyHeaderLayout

How to implement

  • On focus, call updatePoppingHeaderIndexPaths() to recalculate the popping header indexPaths to get the latest indexPaths.
  • Listen to pop indexPaths change on scroll by implementing collectionView(_:,hshlDidUpdatePoppingHeaderIndexPaths:) delegate method.
  • animate container view of your header view.

See Example for recommended implementation.

    // Either in UICollectionViewDelegate or this override method.
    override func didUpdateFocus(in context: UIFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
        layout.updatePoppingHeaderIndexPaths()
        let (pop, unpop) = self.getHeaders(poppingHeadersIndexPaths: self.layout.poppingHeaderIndexPaths)
        UIView.animate(withDuration: Const.unpopDuration, delay: 0, options: [.curveEaseOut], animations: {
            unpop.forEach { $0.unpopHeader() }
        }, completion: nil)
        coordinator.addCoordinatedAnimations({
            pop.forEach { $0.popHeader() }
        }, completion: nil)
        super.didUpdateFocus(in: context, with: coordinator)
    }

    func collectionView(_ collectionView: UICollectionView, hshlDidUpdatePoppingHeaderIndexPaths indexPaths: [IndexPath]) {
        let (pop, unpop) = self.getHeaders(poppingHeadersIndexPaths: self.layout.poppingHeaderIndexPaths)
        UIView.animate(withDuration: Const.unpopDuration, delay: 0, options: [.curveEaseOut], animations: {
            unpop.forEach { $0.unpopHeader() }
            pop.forEach { $0.popHeader() }
        }, completion: nil)
    }

Install

Carthage

github "toshi0383/HorizontalStickyHeaderLayout"

CocoaPods

pod "HorizontalStickyHeaderLayout"

Development

  • Xcode9.1
  • Swift4.0.2

License

MIT

Latest podspec

{
    "name": "HorizontalStickyHeaderLayout",
    "version": "0.4.0",
    "summary": "Horizontal UICollectionViewLayout with Sticky HeaderView",
    "description": "'Horizontal UICollectionViewLayout with Sticky HeaderView'",
    "homepage": "https://github.com/toshi0383/HorizontalStickyHeaderLayout",
    "license": {
        "type": "MIT",
        "file": "LICENSE"
    },
    "authors": {
        "toshi0383": "[email protected]"
    },
    "source": {
        "git": "https://github.com/toshi0383/HorizontalStickyHeaderLayout.git",
        "tag": "0.4.0"
    },
    "social_media_url": "https://twitter.com/toshi0383",
    "platforms": {
        "ios": "9.0",
        "tvos": "9.0"
    },
    "source_files": "HorizontalStickyHeaderLayout/*.swift",
    "pushed_with_swift_version": "4.0"
}

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