The simplest solution for storing a few strings or common types is UserDefaults.

The UserDefaults class provides convenience methods for accessing common types such as floats, doubles, integers, Boolean values, and URLs.

UserDefaults lets us store objects against a key of our choice, It’s a good idea to store these keys somewhere accessible so we can reuse them.

Keys

struct DefaultsKeys {
    static let keyOne = "firstStringKey"
    static let keyTwo = "secondStringKey"
}

Setting

let defaults = UserDefaults.standard
defaults.set("Some String Value", forKey: DefaultsKeys.keyOne)
defaults.set("Another String Value", forKey: DefaultsKeys.keyTwo)

Getting

let defaults = UserDefaults.standard
if let stringOne = defaults.string(forKey: DefaultsKeys.keyOne) {
    print(stringOne) // Some String Value
}
if let stringTwo = defaults.string(forKey: DefaultsKeys.keyTwo) {
    print(stringTwo) // Another String Value
}

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Swift 2.0

In Swift 2.0 UserDefaults was called NSUserDefaults and the setters and getters were named slightly differently:

Setting

let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject("Some String Value", forKey: DefaultsKeys.keyOne)
defaults.setObject("Another String Value", forKey: DefaultsKeys.keyTwo)

Getting

let defaults = NSUserDefaults.standardUserDefaults()
if let stringOne = defaults.stringForKey(DefaultsKeys.keyOne) {
    print(stringOne) // Some String Value
}
if let stringTwo = defaults.stringForKey(DefaultsKeys.keyTwo) {
    print(stringTwo) // Another String Value
}

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For anything more serious than minor config you should consider using a more robust persistent store:

• CoreData
• Realm
• SQLite