WaterfallLayout

Waterfall layout in iOS

Features

Can select flow/waterfall layout per section.
Self-Sizing cell available

How to use

class ViewController: UIViewController {

    @IBOutlet private weak var collectionView: UICollectionView! {
        didSet {
            let layout = WaterfallLayout()
            layout.delegate = self
            layout.sectionInset = UIEdgeInsets(top: 16, left: 16, bottom: 16, right: 16)
            layout.minimumLineSpacing = 8.0
            layout.minimumInteritemSpacing = 8.0
            layout.headerHeight = 50.0
            collectionView.collectionViewLayout = layout
            collectionView.register(...)
            collectionView.dataSource = self
            collectionView.delegate = self
        }
    }
}

extension ViewController: UICollectionDataSource {
    ...
}

extension ViewController: WaterfallLayoutDelegate {
    func collectionViewLayout(for section: Int) -> WaterfallLayout.Layout {
        switch section {
        case 0: return .flow(column: 1) // single column flow layout
        case 1: return .waterfall(column: 3) // three waterfall layout
        default: return .flow(column: 2)
        }
    }

    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(...)
    }    
}

Properties

public var minimumLineSpacing: CGFloat { get set }

public var minimumInteritemSpacing: CGFloat { get set }

public var sectionInset: UIEdgeInsets  { get set }

public var headerHeight: CGFloat  { get set }

public var headerInset: UIEdgeInsets { get set }

public var footerHeight: CGFloat { get set }

public var footerInset: UIEdgeInsets { get set }

public var estimatedItemSize: CGSize { get set }

Layout delegte

public protocol WaterfallLayoutDelegate: class {
    // MARK: - Required
    func collectionViewLayout(for section: Int) -> WaterfallLayout.Layout
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, sizeForItemAt indexPath: IndexPath) -> CGSize

    // MARK: - Optional
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, minimumInteritemSpacingFor section: Int) -> CGFloat?
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, minimumLineSpacingFor section: Int) -> CGFloat?
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, sectionInsetFor section: Int) -> UIEdgeInsets?
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, headerHeightFor section: Int) -> CGFloat?
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, headerInsetFor section: Int) -> UIEdgeInsets?
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, footerHeightFor section: Int) -> CGFloat?
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, footerInsetFor section: Int) -> UIEdgeInsets?
    func collectionView(_ collectionView: UICollectionView, layout: WaterfallLayout, estimatedSizeForItemAt indexPath: IndexPath) -> CGSize?
}

Requirements

iOS 9.0+
Xcode 9+
Swift 4+

Installation

Carthage

Add the following to your Cartfile:

github "sgr-ksmt/WaterfallLayout" ~> 0.1

Run carthage update
Add the framework as described.
Details: Carthage Readme

CocoaPods

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

pod 'WaterfallLayout', '~> 0.1'

and run pod install

Manually Install

Download all *.swift files and put your project.

Change log

Change log is here.

Communication

If you found a bug, open an issue.
If you have a feature request, open an issue.
If you want to contribute, submit a pull request.:muscle:

License

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

pavankataria/WaterfallLayout