SwiftUI Extensions

Collection of useful SwiftUI extensions and elements

Grid based layouts
Sliders (horizontal, vertical, point)
Custom shapes
Data charts
Supports all apple platforms
SwiftUI code patterns (Styles, EnvironmentValues, ViewBuilder)
Active development for production apps

Open /Demo/SwiftUIExtensionsDemo.xcodeproj for more examples for iOS, macOS, watchOS and tvOS

Layouts

Modular Grid

Grid(colors) {
    Rectangle()
        .foregroundColor($0)
}
.gridStyle(
    ModularGridStyle(columns: .min(100), rows: .min(100))
)

Staggered Grid

Grid(1...69, id: \.self) { index in
    Image("\(index)")
        .resizable()
        .scaledToFit()
}
.gridStyle(
    StaggeredGridStyle(tracks: 8, axis: .horizontal, spacing: 4)
)

Tracks

Tracks setting allows you to customize grid behaviour to your specific use-case. Both Modular and Staggered grid use tracks value to calculate layout. In Modular layout both columns and rows are tracks.

public enum Tracks: Hashable {
    case count(Int)
    case fixed(CGFloat)
    case min(CGFloat)
}

Count

Grid is split into equal fractions of size provided by a parent view.

ModularGridStyle(columns: 3, rows: 3)
StaggeredGridStyle(tracks: 8)

Fixed

Item size is fixed to a specific width or height.

ModularGridStyle(columns: .fixed(100), rows: .fixed(100))
StaggeredGridStyle(tracks: .fixed(100))

Min

Autolayout respecting a min item width or height.

ModularGridStyle(columns: .min(100), rows: .min(100))
StaggeredGridStyle(tracks: .min(100))

Preferences

Get item size and position with preferences

struct CardsView: View {
    @State var selection: Int = 0
    
    var body: some View {
        Grid(0..<100) { number in
            Card(title: "\(number)")
                .onTapGesture {
                    self.selection = number
                }
        }
        .padding()
        .overlayPreferenceValue(GridItemBoundsPreferencesKey.self) { preferences in
            RoundedRectangle(cornerRadius: 16)
                .strokeBorder(lineWidth: 4)
                .foregroundColor(.white)
                .frame(
                    width: preferences[self.selection].width,
                    height: preferences[self.selection].height
                )
                .position(
                    x: preferences[self.selection].midX,
                    y: preferences[self.selection].midY
                )
                .animation(.linear)
        }
    }
}

Sliders

Highly customizable sliders and tracks

Simple gradient value slider style

HSlider(value: $value, track:
    LinearGradient(gradient: Gradient(colors: [.red, .orange, .yellow, .green, .blue, .purple, .pink]), startPoint: .leading, endPoint: .trailing)
        .frame(height: 8)
        .cornerRadius(4)
)

Multivalue track

ZStack {
    HTrack(value: value1, view: Capsule().foregroundColor(.red)).opacity(0.5)
    HTrack(value: value2, view: Capsule().foregroundColor(.blue)).opacity(0.5)
    HTrack(value: value3, view: Capsule().foregroundColor(.green)).opacity(0.5)
}
.animation(.spring())
.frame(height: 8)
.background(Color.secondary.opacity(0.25))

Complex range slider style

HRangeSlider(range: $range, in: 0.0...1.0, step: 0.01,
    track:
        HRangeTrack(
            range: range,
            view: LinearGradient(gradient: Gradient(colors: [.yellow, .orange, .red]), startPoint: .leading, endPoint: .trailing),
            mask: Rectangle(),
            configuration: .init(
                offsets: 32
            )
        )
        .background(Color.secondary.opacity(0.25))
        .cornerRadius(16)
        .padding(.vertical, 8)
        .animation(.easeInOut(duration: 0.5)),
    lowerThumb: 
        Capsule()
            .foregroundColor(.white),
    upperThumb:
        Capsule()
            .foregroundColor(.white),
    configuration: .init(
        thumbSize: CGSize(width: 32, height: 64),
        thumbInteractiveSize: CGSize(width: 44, height: 64)
    ),
    onEditingChanged: { print($0) }
)
.frame(height: 64)

Complex point slider style

XYSlider(x: $x, y: $y,
    track:
        RoundedRectangle(cornerRadius: 24)
            .foregroundColor(
                Color(hue: 0.67, saturation: y, brightness: 1.0)
            ),
    thumb:
        ZStack {
            Capsule().frame(width: 12).foregroundColor(.white)
            Capsule().frame(height: 12).foregroundColor(.white)
        }
        .compositingGroup()
        .rotationEffect(Angle(radians: x * 10))
        .shadow(radius: 3),
    configuration: .init(
        options: .interactiveTrack,
        thumbSize: CGSize(width: 48, height: 48)
    )
)
.frame(height: 256)
.shadow(radius: 3)
.padding()

Data Visualization

Build custom charts with SwiftUI

Line Chart

Chart(data: [0.1, 0.3, 0.2, 0.5, 0.4, 0.9, 0.1])
    .chartStyle(
        LineChartStyle(.quadCurve, lineColor: .blue, lineWidth: 5)
    )

Area Chart

Chart(data: [0.1, 0.3, 0.2, 0.5, 0.4, 0.9, 0.1])
    .chartStyle(
        AreaChartStyle(.quadCurve, fill:
            LinearGradient(gradient: .init(colors: [Color.blue.opacity(0.2), Color.blue.opacity(0.05)]), startPoint: .top, endPoint: .bottom)
        )
    )

Stacked Area Chart

Chart(data: matrix)
    .chartStyle(
        StackedAreaChartStyle(.quadCurve, colors: [.yellow, .orange, .red])
    )

Column Chart

Chart(data: [0.1, 0.3, 0.2, 0.5, 0.4, 0.9, 0.1])
    .chartStyle(
        ColumnChartStyle(column: Capsule().foregroundColor(.green), spacing: 2)
    )

Stacked Column Chart

Chart(data: matrix)
    .chartStyle(
        StackedColumnChartStyle(spacing: 2, colors: [.yellow, .orange, .red])
    )

Shapes

Regular Polygons

Pentagon()
Hexagon()
RegularPolygon(sides: 32)

Lines and Curves

QuadCurve(unitPoints: [
    UnitPoint(x: 0.1, y: 0.1),
    UnitPoint(x: 0.5, y: 0.9),
    UnitPoint(x: 0.9, y: 0.1)
])
.stroke(Color.blue, style: .init(lineWidth: 2, lineCap: .round))
.frame(height: 200)

Patterns

GridPattern(horizontalLines: 20, verticalLines: 40)
    .stroke(Color.white.opacity(0.3), style: .init(lineWidth: 1, lineCap: .round))
    .frame(height: 200)
    .background(Color.blue)
    .padding()

SDKs

iOS 13+
Mac Catalyst 13.0+
macOS 10.15+
watchOS 6+
Xcode 11.0+

Roadmap

Animations
'CSS Grid'-like features for Modular Grid
View Modifiers
Rounded regular polygons
Bar chart style

Code Contibutions

Feel free to contribute via fork/pull request to master branch. If you want to request a feature or report a bug please start a new issue.

Coffee Contibutions

If you find this project useful please consider becoming a sponsor.

agscastaneda/SwiftUIExtensions