Notes WWDC 2021 : What’s new in Foundation

Mes notes pour la session What’s new in Foundation de la WWDC 2021.

AttributedString

New struct AttributedString (value type, compatible with String, localizable, safety and security)

var thanks = AttributedString("Thank You")
thanks.font = .body.bold

Has “views”, as collection: characters, runs (aka attributes)

Localization: can now use "\(value)" in string literal for String and AttributedString. New compiler option “use compiler to extract Swift strings”.

Use Markdown to localize attributed strings.

Supports coding/decoding, only need custom implementation for custom attributes (need to conform to MarkdownDecodableAttributedStringKey).

Formatters

New type-safe interface for all formatters.

let date = Date.now
let f1 = date.formatted() // default
let f2 = date.formatted(.dateTime.year().day().month()) // “Jun 7, 2021”
let f3 = date.formatted(.dateTime.year().day().month(.wide)) // “June 7, 2021”
let f4 = date.formatted(.iso8601)

let range = (now..<later).formatted()

let attributed = date.formatted(.attributed) // as `AttributedString`
// can assign attributes by field

Fields: order does not matter, sensible default

Grammar agreement

For instance: adding “s” for plural in English

var body: some View {
  Text("Add ^[\(quantity) \(size) \(food)](inflect: true) to your order")
}

Currently supports Spanish and English only