When caching localized content in an app, it's a good idea to add the current locale to all keys, to prevent bugs when switching languages.

func cache(_ content: Content, forKey key: String) throws {
    let data = try wrap(content) as Data
    let key = localize(key: key)
    try storage.store(data, forKey: key)
}

func loadCachedContent(forKey key: String) -> Content? {
    let key = localize(key: key)
    let data = storage.loadData(forKey: key)
    return data.flatMap { try? unbox(data: $0) }
}

private func localize(key: String) -> String {
    return key + "-" + Bundle.main.preferredLocalizations[0]
}

For two weeks, many websites around the Swift community are featuring indie developers who have been financially impacted by the current pandemic. If you can, please help support these indies by downloading their apps. Today’s app is...

Endless Paper: An infinite (yes, really!) iPad canvas for you to draw, sketch ideas, and organize your work on — which you can then also broadcast as an online whiteboard. Features a custom Metal rendering engine and rock-solid performance.