UserDefaults

extension UserDefaults

Usage examples

// declare a struct to be saved to / restored from UserDefaults
struct Language: Codable, Equatable {
   var name: String
   var version: String
}

let defaults = UserDefaults.standard
let languageKey = "defaultLanguage"

// create an instance
let testLanguage = Language(name: "Swift", version: "4")

// save in defaults
defaults.set(value: testLanguage, forKey: languageKey)

// restore from defaults should succeed
if let language: Language = defaults.get(forKey: languageKey) {
   // use the value found in defaults
} else {
   // did not find it in defaults
}

// remove from defaults
defaults.remove(forKey: languageKey)

// restore from defaults should fail
if let language: Language = defaults.get(forKey: languageKey) {
   // it won't get here after we removed the value from defaults
}