CollectionViewWaterfallLayout

Pinterest inspired layout for UICollectionViews

Note: Updated for Swift 5.0. This was a big upgrade from Swift 2.0, so please submit an issue / fix if you run into anything. Thanks!

CollectionViewWaterfallLayout is a subclass of UICollectionViewLayout written completely in Swift. This class is based off CHTCollectionViewWaterfallLayout which was written by chiahsien in Objective-C. This class tries to use as many new Swifty things to keep the code updated with current design patterns.

The original layout was inspired by Pinterest.

Features

Easy to use - If you are used to working with UICollectionViewFlowLayout, this should feel natural
Highly Customizable
Outstanding Performance
Supports headers and footers

Screen Shots

Prerequisites

ARC
iOS 8+
Xcode 10+
Swift 5.0

Installation

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

pod "CollectionViewWaterfallLayout"

How to Use

Make sure to import the pod in the files you plan to use it in:

import CollectionViewWaterfallLayout

Check out the demo project for an example using storyboards to set up the views, and that programmatically creates and customizes the waterfall layout.

Customizable Properties

Below are the public properties and their default values that you can change to customize the layout

var columnCount: Int = 2
var minimumColumnSpacing: Float = 10.0
var minimumInteritemSpacing: Float = 10.0
var headerHeight: Float = 0.0
var footerHeight: Float = 0.0
var headerInset: UIEdgeInsets = .zero
var footerInset: UIEdgeInsets = .zero
var sectionInset: UIEdgeInsets = .zero

Required Protocol

Your collection view's delegate must conforms to CollectionViewWaterfallLayoutDelegate protocol and implement the required method, all you need to do is return the original size of the item:

func collectionView(collectionView: UICollectionView, layout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize

Optional Protocol

You can customize the layout properties dynamically by using the following optional protocol methods:

func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForHeaderInSection section: Int) -> Float

func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForFooterInSection section: Int) -> Float

func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForSection section: Int) -> UIEdgeInsets

func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForHeaderInSection section: Int) -> UIEdgeInsets

func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForFooterInSection section: Int) -> UIEdgeInsets

func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, minimumInteritemSpacingForSection section: Int) -> Float

Limitation

Only vertical scrolling is supported.
No decoration view.

License

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

ecerney/CollectionViewWaterfallLayout