Swift NSUserDefaults setString:forKey:?

Question

NSUserDefaults has integerForKey:, setInteger:forKey: and stringForKey:, but does not have setString:forKey:.

How

Answer 1

update: Xcode 7.0.1 • Swift 2.0

let myString = "Hello World"

NSUserDefaults.standardUserDefaults().setObject(myString, forKey: "myString")

if let myLoadedString = NSUserDefaults.standardUserDefaults().stringForKey("myString") {
    print(myLoadedString) // "Hello World"
}

The nice thing about Swift is that it allows to you to easily extend the language. You can create your own setString(forKey:), setDate(forKey:), etc... creating a NSUserDefaults extension as follow:

extension NSUserDefaults {
    func setString(string:String, forKey:String) {
        setObject(string, forKey: forKey)
    }
    func setDate(date:NSDate, forKey:String) {
        setObject(date, forKey: forKey)
    }
    func dateForKey(string:String) -> NSDate? {
        return objectForKey(string) as? NSDate
    }
}

let name = "Chris Lattner"
let address = "1 Infinite Loop, Cupertino, CA 95014, United States"
let dob = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!.dateWithEra(1, year: 1978, month: 1, day: 1, hour: 0, minute: 0, second: 0, nanosecond: 0)!

NSUserDefaults().setString(name, forKey: "userName")
NSUserDefaults().setString(address, forKey: "userAddress")
NSUserDefaults().setDate(dob, forKey: "userDOB")

let loadedUserName = NSUserDefaults.standardUserDefaults().stringForKey("userName") ?? ""
let loadedUserAddress = NSUserDefaults.standardUserDefaults().stringForKey("userAddress") ?? ""
let loadedUserDOB = NSUserDefaults.standardUserDefaults().dateForKey("userDOB") ?? NSDate.distantPast()

print(loadedUserName)    // "Chris Lattner"
print(loadedUserAddress) // "1 Infinite Loop, Cupertino, CA 95014, United States"
print(loadedUserDOB.descriptionWithLocale(NSLocale(localeIdentifier: "en_US")))  // "Sunday, January 1, 1978 at 12:00:00