AppInfoProvider.swift - A basic wrapper around your app's Info.plist and more

AppInfoProvider.swift

//
//  AppInfoProvider.swift
//

import Foundation

protocol AppInfoProvider: AnyObject {
    var bundleDisplayName: String { get } // Your app's name.
    var bundleVersion: String { get } // The current build number, e.g 137
    var bundleShortVersionString: String { get } // The current app version, e.g 1.2.0.
    var primaryAppIconName: String { get } // Name of the asset representing the primary app icon.
    var alternateAppIconNames: [String] { get } // List of names of assets representing the alternate app icons.
}

final class DefaultAppInfoProvider: AppInfoProvider {
    private func getValue<Value>(for key: String) -> Value {
        guard
            let value = Bundle.main.infoDictionary?[key] as? Value
        else {
            fatalError("Missing value for \(key) in Info.plist")
        }
        return value
    }

    private func getPrimaryAppIconName() -> String {
        let appIconsDict: [String: [String: Any]] = getValue(for: "CFBundleIcons")

        let primaryIconDict = appIconsDict["CFBundlePrimaryIcon"]

        guard let primaryIconName = primaryIconDict?["CFBundleIconName"] as? String else {
            fatalError("Missing primary icon name")
        }

        return primaryIconName
    }

    private func getAlternateAppIconNames() -> [String] {
        let appIconsDict: [String: [String: Any]] = getValue(for: "CFBundleIcons")

        let alternateIconsDict = appIconsDict["CFBundleAlternateIcons"] as? [String: [String: String]]

        var alternateAppIconNames = [String]()

        alternateIconsDict?.forEach { _, value in
            if let alternateIconName = value["CFBundleIconName"] {
                alternateAppIconNames.append(alternateIconName)
            }
        }

        return alternateAppIconNames
    }

    lazy var bundleDisplayName: String = getValue(for: "CFBundleDisplayName")
    lazy var bundleVersion: String = getValue(for: "CFBundleVersion")
    lazy var bundleShortVersionString: String = getValue(for: "CFBundleShortVersionString")
    lazy var primaryAppIconName: String = getPrimaryAppIconName()
    lazy var alternateAppIconNames: [String] = getAlternateAppIconNames()
}