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"
}
Những điều tốt đẹp về Swift là nó cho phép bạn dễ dàng mở rộng ngôn ngữ. Bạn có thể tạo setString của riêng bạn (forKey :), setDate (forKey :), vv ... tạo ra một phần mở rộng NSUserDefaults như sau:
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
Nguồn
2015-03-18 16:00:02
setObjectForKey –