WaterfallGrid

A waterfall grid layout view for SwiftUI.

Features

Irregular grid of content.
Columns number different per device orientation.
Spacing and grid padding customizable.
Horizontal or vertical scroll direction.
Items update can be animated.

Requirements

iOS 13.0+ / macOS 10.15+ / tvOS 13.0+ / watchOS 6.0+
Xcode 11.0+
Swift 5.1+

Installation

Swift Package Manager

The Swift Package Manager is a tool for automating the distribution of Swift code and is integrated into the swift compiler.

Once you have your Swift package set up, adding WaterfallGrid as a dependency is as easy as adding it to the dependencies value of your Package.swift.

dependencies: [
  .package(url: "https://github.com/paololeonardi/WaterfallGrid.git", from: "0.4.0")
]

CocoaPods

You can install WaterfallGrid via CocoaPods by adding the following line to your Podfile:

pod 'WaterfallGrid', '~> 0.4.0'

Run the pod install command to download the library and integrate it into your Xcode project.

Usage

Initialization

You can create a grid that displays the elements of collection by passing your collection of data and a closure that provides a view for each element in the collection. The grid transforms each element in the collection into a child view by using the supplied closure.

WaterfallGrid works with identifiable data (like SwiftUI.List). You can make your data identifiable in one of two ways: by passing along with your data a key path to a property that uniquely identifies each element, or by making your data type conform to the Identifiable protocol.

Example 1

A grid of views of type Image from a collection of data identified by a key path.

WaterfallGrid((0..<10), id: \.self) { index in
  Image("image\(index)")
    .resizable()
    .aspectRatio(contentMode: .fit)
}

Example 2

A grid of views of type RectangleView from a collection of Identifiable data.

WaterfallGrid(rectangles) { rectangle in
  RectangleView(rectangle: rectangle)
}

or, for simple cases like this, just:

WaterfallGrid(rectangles, content: RectangleView.init)

Grid Style

To customise the appearance of the grid call the gridStyle function and pass the parameters you want to customise.

Columns

WaterfallGrid(cards) { card in
  CardView(card: card)
}
.gridStyle(columns: 2)

WaterfallGrid(cards, content: CardView.init)
.gridStyle(
  columnsInPortrait: 2,
  columnsInLandscape: 3
)

Spacing and Padding

WaterfallGrid(rectangles, content: RectangleView.init)
.gridStyle(
  spacing: 8,
  padding: EdgeInsets(top: 16, leading: 8, bottom: 16, trailing: 8)
)

Animation

WaterfallGrid(rectangles, content: RectangleView.init)
.gridStyle(
  animation: .easeInOut(duration: 0.5)
)

Scroll Behaviour

Scroll direction & Indicators

WaterfallGrid(rectangles, content: RectangleView.init)
.scrollOptions(
  direction: .horizontal,
  showsIndicators: true
)

A Complete Example

WaterfallGrid(cards) { card in
  CardView(card: card)
}
.gridStyle(
  columnsInPortrait: 2,
  columnsInLandscape: 3,
  spacing: 8,
  padding: EdgeInsets(top: 16, leading: 8, bottom: 16, trailing: 8),
  animation: .easeInOut(duration: 0.5)
)
.scrollOptions(
  direction: .horizontal,
  showsIndicators: true
)