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What we've learnt building a DESIGN SYSTEM Lucy Galik in SwiftUI

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PROPOSAL

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WORKING GROUP

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USER RESEARCH

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GUIDING PRINCIPLES

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GUIDING PRINCIPLES • Discoverability

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GUIDING PRINCIPLES • Discoverability • Keep the good stu f

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GUIDING PRINCIPLES • Discoverability • Keep the good stu ff • no UIKit

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GUIDING PRINCIPLES • Discoverability • Keep the good stu ff • no UIKit • Accessibility fi rst

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GUIDING PRINCIPLES • Discoverability • Keep the good stu ff • no UIKit • Accessibility fi rst • Keep it simple

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GUIDING PRINCIPLES • Discoverability • Keep the good stu ff • no UIKit • Accessibility fi rst • Keep it simple • Limited API

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Discoverability

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Discoverability

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Discoverability • Documentation

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Discoverability • Documentation • Naming

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Discoverability • Documentation • Naming • Demo app

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Discoverability • Documentation • Naming • Demo app • Previews

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Discoverability • Documentation • Naming • Demo app • Previews • Snapshot Tests

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Discoverability • Documentation • Naming • Demo app • Previews • Snapshot Tests • Structure

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Keep the good stuff

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Keep the good stuff

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Keep the good stuff @_exported import DesignSystemFoundation

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Keep the good stuff Theme

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Keep the good stuff Theme class HostingController: UIHostingController { init( rootView: Content, theme: Theme ) { super.init( rootView: HostingView( content: rootView, theme: theme ) ) } } struct HostingView: View { let theme: Theme let content: Content var body: some View { content .environment(\.theme, theme) } }

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no UIKit

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no UIKit

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no UIKit

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no UIKit struct CustomButton: View { let title: String let isEnabled: Bool let isLoading: Bool let action: () -> Void init( title: String, isEnabled: Bool, isLoading: Bool, action: @escaping () -> Void ) { // ... } }

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no UIKit @Environment struct CustomButton: View { let title: String let isEnabled: Bool let isLoading: Bool let action: () -> Void init( title: String, isEnabled: Bool, isLoading: Bool, action: @escaping () -> Void ) { // ... } } struct CustomButton: View { let title: String @Environment(\.isEnabled) var isEnabled @Environment(\.isLoading) var isLoading let action: () -> Void init( title: String, action: @escaping () -> Void ) { // … } }

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no UIKit ViewModel struct CardViewModel { let icon: String let title: String let subtitle: String let action: () -> Void } struct Card: View { let viewModel: CardViewModel var body: some View { // ... } }

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no UIKit ViewModel struct CardViewModel { let icon: String let title: String let subtitle: String let action: () -> Void } struct Card: View { let viewModel: CardViewModel var body: some View { // ... } } struct CardViewModel { let icon: String let title: String let subtitle: String let action: () -> Void } extension CardViewModel: View { var body: some View { // ... } }

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no UIKit ViewModel struct CardViewModel { let icon: String let title: String let subtitle: String let action: () -> Void } struct Card: View { let viewModel: CardViewModel var body: some View { // ... } } struct Card: View { let icon: String let title: String let subtitle: String let action: () -> Void var body: some View { // ... } }

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no UIKit Styles struct AnotherButton: View { enum Style { case primary case secondary case destructive } let style: Style // ... var body: some View { // ... } var foregroundColor: Color { switch style { // ... } } var backgroundColor: Color { switch style { // ... } }

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no UIKit Styles struct AnotherButton: View { enum Style { case primary case secondary case destructive } let style: Style // ... var body: some View { // ... } var foregroundColor: Color { switch style { // ... } } var backgroundColor: Color { switch style { // ... } } struct AnotherButton: View { let style: AnotherButtonStyle // ... var body: some View { Button( // ... ) .buttonStyle(style) } } struct AnotherButtonStyle: ButtonStyle { let foregroundColor: Color let backgroundColor: Color func makeBody( configuration: Configuration ) -> some View { // ... } }

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no UIKit Styles struct AnotherButton: View { let style: AnotherButtonStyle // ... var body: some View { Button( // ... ) .buttonStyle(style) } } struct AnotherButtonStyle: ButtonStyle { let foregroundColor: Color let backgroundColor: Color func makeBody( configuration: Configuration ) -> some View { // ... } }

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no UIKit Styles struct AnotherButton: View { let style: AnotherButtonStyle // ... var body: some View { Button( // ... ) .buttonStyle(style) } } struct AnotherButtonStyle: ButtonStyle { let foregroundColor: Color let backgroundColor: Color func makeBody( configuration: Configuration ) -> some View { // ... } }

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no UIKit Styles struct AnotherButton: View { let style: AnotherButtonStyle // ... var body: some View { Button( // ... ) .buttonStyle(style) } } struct AnotherButtonStyle: ButtonStyle { let foregroundColor: Color let backgroundColor: Color func makeBody( configuration: Configuration ) -> some View { // ... } } extension AnotherButtonStyle { static let primary = AnotherButtonStyle( // ...) static let secondary = AnotherButtonStyle( // ... ) static let destructive = AnotherButtonStyle( // ... ) }

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Accessibility

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Accessibility

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Accessibility

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Accessibility accessibilityRepresentation struct CustomSlider: View { // ... var body: some View { slider() .accessibilityRepresentation { Slider(value: $value, in: range, step: step) } } }

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Accessibility

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Accessibility var body: some View { HStack { Image(illustration) Text(title) Text(subtitle) } .accessibilityLabel(accessibilityLabel) }

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Accessibility var body: some View { HStack { Image(illustration) .accessibilityLabel(illustrationAccessibilityLabel) Text(title) Text(subtitle) } }

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Accessibility var body: some View { HStack { Image(illustration) .accessibilityHidden(true) Text(title) Text(subtitle) } }

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Accessibility var body: some View { Button( action: action, label: { title } ) .accessibilityLabel(title) }

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Accessibility var body: some View { Button( action: action, label: { title } ) .accessibilityLabel(title) }

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Keep it simple

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Keep it simple

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Keep it simple struct Footer: View { let prompt: Text? let callout: Callout? let primary: LargeButton let secondary: LargeButton? let axis: Axis var body: some View { // ... } public init( button: LargeButton ) { // ... } public init( prompt: Text, top: LargeButton, bottom: LargeButton ) { // ... } }

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Keep it simple struct Footer: View { let prompt: Text? let callout: Callout? let primary: LargeButton let secondary: LargeButton? let axis: Axis var body: some View { // ... } public init( button: LargeButton ) { // ... } public init( prompt: Text, top: LargeButton, bottom: LargeButton ) { // ... } }

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Limited API

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Limited API struct Footer: View { // ... init( prompt: Text, top: LargeButton, bottom: LargeButton ) { // ... } }

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Limited API struct Footer: View { // ... init( prompt: Text, top: LargeButton, bottom: LargeButton ) { // ... } } struct Footer: View { // ... init( prompt: Text, @ViewBuilder top: () -> Primary, @ViewBuilder bottom: () -> Secondary ) { // ... } }

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and write it down Have a plan

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Create a team

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Know your user*

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but be ready to adjust them Have Guidelines

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Don’t fight the framework

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