SwiftUI Preview Helpers for Most Edge Cases

AllComponentPreviews.swift

/**
Copyright 2019 Kyle Sherman

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

import SwiftUI

/// This view modifier should only be used in a `PreviewProvider` in order to
/// automatically display previews for many different configurations to test edge cases
/// of accessiblity and other device changes. You can use it with the `.allPreviewDevices`
/// function on the `View` protocol.
///
/// - Note: This should be used for full screen views. See `AllComponentPreview` for
/// views that are not the full screen.
public struct AllPreviewDevices: ViewModifier {

    /// Represents all the different device types that can be previewed at a time.
    /// You can use it by making a set of the ones you want to have.
    /// e.g. `[.iPhone, .iPad]`
    /// - Note: You can't use `tv` at the same time as `iPhone` or `iPad`.
    public struct DeviceType: OptionSet {
        public let rawValue: Int
        public init(rawValue: Int) {
            self.rawValue = rawValue
        }
        public static let iPhone = DeviceType(rawValue: 1 << 0)
        public static let iPad = DeviceType(rawValue: 1 << 1)
        public static let tv = DeviceType(rawValue: 1 << 2)
    }

    /// Set the type of devices you want previewed.
    public let deviceTypes: DeviceType

    // Maximum number of previews is 15!
    public func body(content: Content) -> some View {
        Group {
            if deviceTypes.contains(.iPhone) {
                // 1
                content
                    .previewDevice(.iPhone11Pro)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("11 Pro + Normal Text Size")

                // Color Scheme
                // 2
                content
                    .previewDevice(.smallestiPhone)
                    .environment(\.colorScheme, .dark)
                    .previewDisplayName("Smallest Phone + Dark")

                // Text Sizes
                // 3
                content
                    .previewDevice(.smallestiPhone)
                    .environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("Smallest Phone + Largest Accessibility")
                // 4, no notch
                content
                    .previewDevice(.iPhone8)
                    .environment(\.sizeCategory, .extraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("No notch + Large Text Size")
                // 5, smallest accessibility
                content
                    .previewDevice(.iPhone8)
                    .environment(\.sizeCategory, .accessibilityMedium)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("No notch + Smallest Accessibility")

                // Layout direction + Bold
                // 6
                content
                    .previewDevice(.iPhone11ProMax)
                    .environment(\.colorScheme, .light)
                    .environment(\.layoutDirection, .rightToLeft)
                    .environment(\.legibilityWeight, .bold)
                    .previewDisplayName("11 Pro Max, RTL, Bold")
            }

            if deviceTypes.contains(.iPad) {
                // 7
                content
                    .environment(\.colorScheme, .light)
                    .previewLayout(.iPadPro11Landscape)
                    .previewDisplayName("iPad 11\" Landscape")

                // Text Sizes
                // 8
                content
                    .previewDevice(.smallestiPad)
                    .environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("Smallest iPad + Largest Accessibility")
                // 8
                content
                    .previewDevice(.iPadPro11)
                    .environment(\.sizeCategory, .medium)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("iPad 11\" + Normal Text Size")
                // 9, no notch
                content
                    .previewDevice(.iPadPro9)
                    .environment(\.sizeCategory, .extraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("iPad No notch + Large Text Size")

                // Color Scheme
                // 10
                content
                    .previewDevice(.largestiPad)
                    .environment(\.colorScheme, .dark)
                    .previewDisplayName("Largest iPad + Dark")

                // Layout direction + Bold
                // 11
                content
                    .previewDevice(.smallestiPad)
                    .environment(\.colorScheme, .light)
                    .environment(\.layoutDirection, .rightToLeft)
                    .environment(\.legibilityWeight, .bold)
                    .previewDisplayName("Smallest iPad, RTL, Bold")

                // Multitasking
                // 12
                content
                    .environment(\.colorScheme, .light)
                    .environment(\.horizontalSizeClass, .compact)
                    .previewLayout(.iPadProSplit11Landscape)
                    .previewDisplayName("iPad 11\" Split Landscape")
                // 13
                content
                    .environment(\.colorScheme, .light)
                    .environment(\.horizontalSizeClass, .compact)
                    .previewLayout(.iPadProSplit11Porait)
                    .previewDisplayName("iPad 11\" Split Portrait")
            }

            if deviceTypes.contains(.tv) {
                // Text Sizes
                // 1
                content
                    .previewDevice(.regularTV)
                    .environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("1080 + Largest Accessibility")
                // 2
                content
                    .previewDevice(.uhdTV)
                    .environment(\.sizeCategory, .medium)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("4K + Normal Text Size")
                // 3
                content
                    .previewDevice(.uhdTV)
                    .environment(\.sizeCategory, .extraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("4K + Large Text Size")

                // Color Scheme
                // 4
                content
                    .previewDevice(.uhdTV)
                    .environment(\.colorScheme, .dark)
                    .previewDisplayName("4K + Dark")

                // Layout direction + Bold
                // 5
                content
                    .previewDevice(.uhdTV)
                    .environment(\.colorScheme, .light)
                    .environment(\.layoutDirection, .rightToLeft)
                    .environment(\.legibilityWeight, .bold)
                    .previewDisplayName("4K, RTL, Bold")
            }
        }
    }
}

extension View {

    /// This will make multiple new preview devices to test all different types of edge
    /// cases.
    /// - Note: This should only be used in DEBUG in your PreviewProvider for a view.
    /// - Parameter deviceTypes: The type of devices you wish to test. Make sure to give
    /// at least 1 type. You cannot mix iPhone and iPad with tv.
    /// e.g. `[.iPhone, .iPad]`
    public func allPreviewDevices(deviceTypes: AllPreviewDevices.DeviceType) -> some View {
        ModifiedContent(
            content: self,
            modifier: AllPreviewDevices(deviceTypes: deviceTypes))
    }

    #if os(iOS)
    /// This will make multiple new preview devices to test all different types of edge
    /// cases.
    /// This defaults to displaying all device types running iOS or iPadOS.
    public func allPreviewDevices() -> some View {
        ModifiedContent(
            content: self,
            modifier: AllPreviewDevices(deviceTypes: [.iPhone, .iPad]))
    }
    #elseif os(tvOS)
    /// This will make multiple new preview devices to test all different types of edge
    /// cases.
    /// This defaults to displaying all device types for tvOS.
    public func allPreviewDevices() -> some View {
        ModifiedContent(
            content: self,
            modifier: AllPreviewDevices(deviceTypes: [.tv]))
    }
    #endif
}


import SwiftUI

/// This view modifier should only be used in a `PreviewProvider` in order to
/// automatically display previews for many different configurations to test edge cases
/// of accessiblity and other device changes. You can use it with the
/// `.allComponentPreview` function on the `View` protocol.
///
/// - Note: This should be used for single components that aren't the full screen.
/// See `AllPreviewDevices` for views that are the full screen.
public struct AllComponentPreviews: ViewModifier {
    public func body(content: Content) -> some View {
        Group {
            // Text Sizes
            // 1
            content
                .environment(\.colorScheme, .light)
                .previewDisplayName("Normal (Light)")
            // 2
            content
                .environment(\.sizeCategory, /*@START_MENU_TOKEN@*/.accessibilityExtraExtraExtraLarge/*@END_MENU_TOKEN@*/)
                .environment(\.colorScheme, .light)
                .previewDisplayName("Largest Accessibility Text")
            // 3
            content
                .environment(\.sizeCategory, .extraExtraLarge)
                .environment(\.colorScheme, .light)
                .previewDisplayName("Large Text")
            // 4
            content
                .environment(\.sizeCategory, .accessibilityMedium)
                .environment(\.colorScheme, .light)
                .previewDisplayName("Smallest Accessibility Text")

            // Color Schemes
            // 5
            content
                .environment(\.colorScheme, .dark)
                .previewDisplayName("Normal (Dark)")

            // Layout direction + Bold
            content
                .environment(\.colorScheme, .light)
                .environment(\.layoutDirection, .rightToLeft)
                .environment(\.legibilityWeight, .bold)
                .previewDisplayName("RTL + Bold")
        }
    }
}

public extension View {
    /// This will make multiple new previews to test all different types of edge
    /// cases.
    /// - Note: This should only be used in DEBUG in your PreviewProvider for a view.
    func allComponentPreviews() -> some View {
        ModifiedContent(content: self, modifier: AllComponentPreviews())
    }
}

AllPreviewDevices.swift

/**
Copyright 2019 Kyle Sherman

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

import SwiftUI

/// This view modifier should only be used in a `PreviewProvider` in order to
/// automatically display previews for many different configurations to test edge cases
/// of accessiblity and other device changes. You can use it with the `.allPreviewDevices`
/// function on the `View` protocol.
///
/// - Note: This should be used for full screen views. See `AllComponentPreview` for
/// views that are not the full screen.
public struct AllPreviewDevices: ViewModifier {

    /// Represents all the different device types that can be previewed at a time.
    /// You can use it by making a set of the ones you want to have.
    /// e.g. `[.iPhone, .iPad]`
    /// - Note: You can't use `tv` at the same time as `iPhone` or `iPad`.
    public struct DeviceType: OptionSet {
        public let rawValue: Int
        public init(rawValue: Int) {
            self.rawValue = rawValue
        }
        public static let iPhone = DeviceType(rawValue: 1 << 0)
        public static let iPad = DeviceType(rawValue: 1 << 1)
        public static let tv = DeviceType(rawValue: 1 << 2)
    }

    /// Set the type of devices you want previewed.
    public let deviceTypes: DeviceType

    // Maximum number of previews is 15!
    public func body(content: Content) -> some View {
        Group {
            if deviceTypes.contains(.iPhone) {
                // 1
                content
                    .previewDevice(.iPhone11Pro)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("11 Pro + Normal Text Size")

                // Color Scheme
                // 2
                content
                    .previewDevice(.smallestiPhone)
                    .environment(\.colorScheme, .dark)
                    .previewDisplayName("Smallest Phone + Dark")

                // Text Sizes
                // 3
                content
                    .previewDevice(.smallestiPhone)
                    .environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("Smallest Phone + Largest Accessibility")
                // 4, no notch
                content
                    .previewDevice(.iPhone8)
                    .environment(\.sizeCategory, .extraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("No notch + Large Text Size")
                // 5, smallest accessibility
                content
                    .previewDevice(.iPhone8)
                    .environment(\.sizeCategory, .accessibilityMedium)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("No notch + Smallest Accessibility")

                // Layout direction + Bold
                // 6
                content
                    .previewDevice(.iPhone11ProMax)
                    .environment(\.colorScheme, .light)
                    .environment(\.layoutDirection, .rightToLeft)
                    .environment(\.legibilityWeight, .bold)
                    .previewDisplayName("11 Pro Max, RTL, Bold")
            }

            if deviceTypes.contains(.iPad) {
                // 7
                content
                    .environment(\.colorScheme, .light)
                    .previewLayout(.iPadPro11Landscape)
                    .previewDisplayName("iPad 11\" Landscape")

                // Text Sizes
                // 8
                content
                    .previewDevice(.smallestiPad)
                    .environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("Smallest iPad + Largest Accessibility")
                // 8
                content
                    .previewDevice(.iPadPro11)
                    .environment(\.sizeCategory, .medium)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("iPad 11\" + Normal Text Size")
                // 9, no notch
                content
                    .previewDevice(.iPadPro9)
                    .environment(\.sizeCategory, .extraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("iPad No notch + Large Text Size")

                // Color Scheme
                // 10
                content
                    .previewDevice(.largestiPad)
                    .environment(\.colorScheme, .dark)
                    .previewDisplayName("Largest iPad + Dark")

                // Layout direction + Bold
                // 11
                content
                    .previewDevice(.smallestiPad)
                    .environment(\.colorScheme, .light)
                    .environment(\.layoutDirection, .rightToLeft)
                    .environment(\.legibilityWeight, .bold)
                    .previewDisplayName("Smallest iPad, RTL, Bold")

                // Multitasking
                // 12
                content
                    .environment(\.colorScheme, .light)
                    .environment(\.horizontalSizeClass, .compact)
                    .previewLayout(.iPadProSplit11Landscape)
                    .previewDisplayName("iPad 11\" Split Landscape")
                // 13
                content
                    .environment(\.colorScheme, .light)
                    .environment(\.horizontalSizeClass, .compact)
                    .previewLayout(.iPadProSplit11Porait)
                    .previewDisplayName("iPad 11\" Split Portrait")
            }

            if deviceTypes.contains(.tv) {
                // Text Sizes
                // 1
                content
                    .previewDevice(.regularTV)
                    .environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("1080 + Largest Accessibility")
                // 2
                content
                    .previewDevice(.uhdTV)
                    .environment(\.sizeCategory, .medium)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("4K + Normal Text Size")
                // 3
                content
                    .previewDevice(.uhdTV)
                    .environment(\.sizeCategory, .extraExtraExtraLarge)
                    .environment(\.colorScheme, .light)
                    .previewDisplayName("4K + Large Text Size")

                // Color Scheme
                // 4
                content
                    .previewDevice(.uhdTV)
                    .environment(\.colorScheme, .dark)
                    .previewDisplayName("4K + Dark")

                // Layout direction + Bold
                // 5
                content
                    .previewDevice(.uhdTV)
                    .environment(\.colorScheme, .light)
                    .environment(\.layoutDirection, .rightToLeft)
                    .environment(\.legibilityWeight, .bold)
                    .previewDisplayName("4K, RTL, Bold")
            }
        }
    }
}

extension View {

    /// This will make multiple new preview devices to test all different types of edge
    /// cases.
    /// - Note: This should only be used in DEBUG in your PreviewProvider for a view.
    /// - Parameter deviceTypes: The type of devices you wish to test. Make sure to give
    /// at least 1 type. You cannot mix iPhone and iPad with tv.
    /// e.g. `[.iPhone, .iPad]`
    public func allPreviewDevices(deviceTypes: AllPreviewDevices.DeviceType) -> some View {
        ModifiedContent(
            content: self,
            modifier: AllPreviewDevices(deviceTypes: deviceTypes))
    }

    #if os(iOS)
    /// This will make multiple new preview devices to test all different types of edge
    /// cases.
    /// This defaults to displaying all device types running iOS or iPadOS.
    public func allPreviewDevices() -> some View {
        ModifiedContent(
            content: self,
            modifier: AllPreviewDevices(deviceTypes: [.iPhone, .iPad]))
    }
    #elseif os(tvOS)
    /// This will make multiple new preview devices to test all different types of edge
    /// cases.
    /// This defaults to displaying all device types for tvOS.
    public func allPreviewDevices() -> some View {
        ModifiedContent(
            content: self,
            modifier: AllPreviewDevices(deviceTypes: [.tv]))
    }
    #endif
}

PreviewHelperData.swift

/**
Copyright 2019 Kyle Sherman

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

import SwiftUI

public extension PreviewDevice {

    // iPhone
    static let iPhoneSE = PreviewDevice(rawValue: "iPhone SE")
    static let iPhone8 = PreviewDevice(rawValue: "iPhone 8")
    static let iPhone11 = PreviewDevice(rawValue: "iPhone 11")
    static let iPhone11Pro = PreviewDevice(rawValue: "iPhone 11 Pro")
    static let iPhone8Plus = PreviewDevice(rawValue: "iPhone 8 Plus")
    static let iPhone11ProMax = PreviewDevice(rawValue: "iPhone 11 Pro Max")

    static let smallestiPhone = iPhoneSE
    static let largestiPhone = iPhone11ProMax

    // iPad
    static let iPadPro9 = PreviewDevice(rawValue: "iPad Pro (9.7-inch)")
    static let iPadPro11 = PreviewDevice(rawValue: "iPad Pro (11-inch)")
    static let iPadPro12 = PreviewDevice(rawValue: "iPad Pro (12.9-inch) (3rd generation)")

    static let smallestiPad = iPadPro9
    static let largestiPad = iPadPro12

    // TV
    static let regularTV = PreviewDevice(rawValue: "Apple TV")
    static let uhdTV = PreviewDevice(rawValue: "Apple TV 4K")
}

extension PreviewLayout {

    // iPad
    static let iPadPro11Landscape = PreviewLayout.fixed(width: 1194, height: 834)
    static let iPadPro12Landscape = PreviewLayout.fixed(width: 1366, height: 1024)
    static let iPadProSplit11Landscape = PreviewLayout.fixed(width: 592, height: 834)
    static let iPadProSplit11Porait = PreviewLayout.fixed(width: 504, height: 1194)
}