How can I use UserDefaults in Swift

Question

How can I use UserDefaults to save retrieve strings  booleans and other data in Swift

User · Answer

class UserDefaults WorstPresidentName       static let key    appname worstPresidentName       static var value  String            get               return UserDefaults standard string forKey  key                    set               if newValue    nil                   UserDefaults standard set newValue  forKey  key                else                   UserDefaults standard removeObject forKey  key

User · Answer

Swift 4    Store      UserDefaults standard set object value  forKey   key name     Retrive      var returnValue   datatype     UserDefaults standard object forKey   key name   as   datatype    Remove      UserDefaults standard removeObject forKey  key name

User · Answer

Swift 4  I have used Enum for handling UserDefaults   This is just a sample code  You can customize it as per your requirements   For Storing  Retrieving  Removing  In this way just add a key for your UserDefaults key to the enum  Handle values while getting and storing according to dataType and your requirements   enum UserDefaultsConstant   String       case AuthToken  FcmToken      static let defaults   UserDefaults standard        Store     func setValue value   Any            switch self           case  AuthToken  FcmToken              if let     value as  String                   UserDefaults standard set value  forKey  self rawValue                            break                    UserDefaults standard synchronize               Retrieve     func getValue   - gt  Any            switch self           case  AuthToken              if UserDefaults standard value forKey  UserDefaultsConstant AuthToken rawValue     nil                     return  Bearer    UserDefaults standard value forKey  UserDefaultsConstant AuthToken rawValue  as  String                            else                   return                           case  FcmToken               if UserDefaults standard value forKey  UserDefaultsConstant FcmToken rawValue     nil                    print UserDefaults standard value forKey  UserDefaultsConstant FcmToken rawValue                   return  UserDefaults standard value forKey  UserDefaultsConstant FcmToken rawValue  as  String                            else                   return                                         Remove     func removeValue             UserDefaults standard removeObject forKey  self rawValue          UserDefaults standard synchronize             For storing a value in userdefaults   if let authToken   resp data  token        UserDefaultsConstant AuthToken setValue value  authToken          For retrieving a value from userdefaults     As AuthToken value is a string      UserDefaultsConstant AuthToken getValue   as  String

User · Answer

ref  NSUserdefault objectTypes  Swift 3 and above  Store  UserDefaults standard set true  forKey   Key     Bool UserDefaults standard set 1  forKey   Key      Integer UserDefaults standard set  TEST   forKey   Key     setObject   Retrieve   UserDefaults standard bool forKey   Key    UserDefaults standard integer forKey   Key    UserDefaults standard string forKey   Key     Remove   UserDefaults standard removeObject forKey   Key     Remove all Keys   if let appDomain   Bundle main bundleIdentifier   UserDefaults standard removePersistentDomain forName  appDomain       Swift 2 and below  Store  NSUserDefaults standardUserDefaults   setObject newValue  forKey   yourkey   NSUserDefaults standardUserDefaults   synchronize     Retrieve    var returnValue   NSString     NSUserDefaults standardUserDefaults   objectForKey  yourkey   as   NSString    Remove   NSUserDefaults standardUserDefaults   removeObjectForKey  yourkey      Register     registerDefaults  adds the registrationDictionary to the last item in every search list  This means that after NSUserDefaults has looked for a value in every other valid location  it will look in registered defaults  making them useful as a  fallback  value  Registered defaults are never stored between runs of an application  and are visible only to the application that registers them       Default values from Defaults Configuration Files will automatically be registered    for example detect the app from launch   create the struct for save launch  struct DetectLaunch   static let keyforLaunch    validateFirstlunch  static var isFirst  Bool       get           return UserDefaults standard bool forKey  keyforLaunch            set           UserDefaults standard set newValue  forKey  keyforLaunch              Register default values on app launch   UserDefaults standard register defaults            DetectLaunch isFirst  true          remove the value on app termination   func applicationWillTerminate   application  UIApplication        DetectLaunch isFirst   false      and check the condition as  if DetectLaunch isFirst        app launched from first       UserDefaults suite name  another one property suite name  mostly its used for  App Groups concept  the example scenario I taken from here       The use case is that I want to separate my UserDefaults  different business logic may require Userdefaults to be grouped separately  by an identifier just like Android s SharedPreferences  For example  when a user in my app clicks on logout button  I would want to clear his account related defaults but not location of the the device    let user   UserDefaults suiteName  User       use of userDefaults synchronize  the detail info has added in the duplicate answer

User · Answer

UserDefault Helper swift  import UIKit  private enum Defaults  String      case countryCode    countryCode     case userloginId      userloginid     final class UserDefaultHelper    static var countryCode  String        set           set value  newValue  key   countryCode        get           return  get valueForKay   countryCode  as  String                static var userloginId  String        set           set value  newValue  key   userloginId        get           return  get valueForKay   userloginId  as  String                private static func  set value  Any   key  Defaults        UserDefaults standard set value  forKey  key rawValue     private static func  get valueForKay key  Defaults - gt  Any        return UserDefaults standard value forKey  key rawValue     static func deleteCountryCode         UserDefaults standard removeObject forKey  Defaults countryCode rawValue      static func deleteUserLoginId         UserDefaults standard removeObject forKey  Defaults userloginId rawValue         Usage   Save Value   UserDefaultHelper userloginId   data  user id   as  String   Fetch Value   let userloginid   UserDefaultHelper userloginId   Delete Value   UserDefaultHelper deleteUserLoginId

User · Answer

Save NSUserDefaults standardUserDefaults   setObject  yourString   forKey   YourStringKey      retrive let yourStr   AnyObject    NSUserDefaults standardUserDefaults   objectForKey  YourStringKey

User · Answer

I saved NSDictionary normally and able to get it correctly     dictForaddress   placemark addressDictionary  as NSDictionary         let userDefaults   UserDefaults standard         userDefaults set dictForaddress  forKey Constants kAddressOfUser       For getting data from NSDictionary   let userDefaults   UserDefaults standard     let dictAddress   userDefaults object forKey  Constants kAddressOfUser  as  NSDictionary

User · Answer

You can use NSUserDefaults in swift this way    IBAction func writeButton sender  UIButton        let defaults   NSUserDefaults standardUserDefaults       defaults setObject  defaultvalue   forKey   userNameKey        IBAction func readButton sender  UIButton        let defaults   NSUserDefaults standardUserDefaults       let name   defaults stringForKey  userNameKey       println name    Prints defaultvalue in console

User · Answer

In class A  set value for key   let text    hai    UserDefaults standard setValue text  forKey   textValue     In class B  get the value for the text using the key which declared in class A and assign it to respective variable which you need   var valueOfText    UserDefaults value forKey   textValue

User · Answer

I would say Anbu s answer perfectly fine but I had to add guard while fetching preferences to make my program doesn t fail  Here is the updated code snip in Swift 5     Storing data in UserDefaults    IBAction func savePreferenceData   sender  Any            print  Storing data             UserDefaults standard set  RDC   forKey   UserName     String         UserDefaults standard set  TestPass   forKey   Passowrd      String         UserDefaults standard set 21  forKey   Age      Integer             Fetching data from UserDefaults        IBAction func fetchPreferenceData   sender  Any            print  Fetching data                added guard         guard let uName   UserDefaults standard string forKey   UserName   else   return           print  User Name is    uName          print UserDefaults standard integer forKey   Age

User · Answer

Swift 5 and above   let defaults   UserDefaults standard  defaults set 25  forKey   Age   let savedInteger   defaults integer forKey   Age    defaults set true  forKey   UseFaceID   let savedBoolean   defaults bool forKey   UseFaceID    defaults set CGFloat pi  forKey   Pi   defaults set  Your Name   forKey   Name   defaults set Date    forKey   LastRun     let array     Hello    World   defaults set array  forKey   SavedArray     let savedArray   defaults object forKey   SavedArray   as   String      String    let dict     Name    Your    Country    YourCountry   defaults set dict  forKey   SavedDict    let savedDictionary   defaults object forKey   SavedDictionary   as   String  String      String  String

User · Answer

Best way to use UserDefaults   Steps   Create extension of UserDefaults  Create enum with required Keys to store in local   Store and retrieve the local data wherever you want   Sample   extension UserDefaults         MARK  Check Login     func setLoggedIn value  Bool            set value  forKey  UserDefaultsKeys isLoggedIn rawValue            synchronize              func isLoggedIn  - gt  Bool           return bool forKey  UserDefaultsKeys isLoggedIn rawValue               MARK  Save User Data     func setUserID value  Int           set value  forKey  UserDefaultsKeys userID rawValue            synchronize                MARK  Retrieve User Data     func getUserID   - gt  Int          return integer forKey  UserDefaultsKeys userID rawValue            enum for Keys used to store data  enum UserDefaultsKeys   String       case isLoggedIn     case userID     Save in UserDefaults where you want   UserDefaults standard setLoggedIn value  true              String UserDefaults standard setUserID value  result User id      String   Retrieve data anywhere in app  print  ID     UserDefaults standard getUserID      UserDefaults standard getUserID     Remove Values  UserDefaults standard removeObject forKey  UserDefaultsKeys userID     This way you can store primitive data in best  Update You need no use synchronize   to store the values  As  Moritz pointed out the it unnecessary and given the article about it Check comments for more detail

[ios] How can I use UserDefaults in Swift?

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