Returns a dictionary that contains a union of all key-value pairs in the domains in the search list. Returns the double value associated with the specified key.įunc dictionaryRepresentation() -> Returns the float value associated with the specified key. Returns the integer value associated with the specified key. Returns the Boolean value associated with the specified key. Returns the data object associated with the specified key. Returns the array of strings associated with the specified key. Returns the string associated with the specified key.įunc stringArray(forKey: String) -> ? Returns the dictionary object associated with the specified key. Returns the array associated with the specified key.įunc dictionary(forKey: String) -> ? Returns the URL associated with the specified key. Returns the object associated with the specified key. You have the following options straight from the apple documentation for 'getting' data from the defaults. None of the answers really cover in detail the default built in local storage capabilities. If you didn't check "Core Data"when you created your app, you can add it after and it only takes five minutes: So for anyone reading this post who's struggling with NSUserDefault type issues or whose need is more than storing strings, consider spending an hour or two playing with core data. I had my table array being saved in Core Data and reloading the data upon opening the app back up! The tutorial code was easy enough to adapt and I was able to have it store both title and detail arrays with only a little extra experimenting. So I ignored the warnings about Core Data being a more difficult solution and started reading. Your app's NSUserDefaults is now automatically sent to the Watch Extension. Update: Also, if you add Apple Watch support, there's another potential consideration. Store arrays and other data using Core Data, it's not as hard as they say. Only use NSUserDefaults for storing simple strings or booleans related to preferences. If you're learning how to code, learn the scalable way. I realized that if you're storing more than a few strings or booleans, NSUserDefaults really isn't ideal. Then I learned that retrieving an array isn't straight forward. NSUserDefaults is Also Limited in Functionįurther reading revealed how the read/write of NSUserDefaults really forces the app to read/write everything or nothing, all at once, so it isn't efficient. I spent hours trying to get type-errors to go away. However, I wanted to store a dictionary and, although possible, it was proving to be a pain. When I was implementing long term (after app close) data storage for the first time, everything I read online pointed me towards NSUserDefaults. If let stringTwo = defaults.stringForKey(įor anything more serious than minor config you should consider using a more robust persistent store: If let stringOne = defaults.stringForKey( Getting let defaults = NSUserDefaults.standardUserDefaults() Setting let defaults = NSUserDefaults.standardUserDefaults() In Swift 2.0 UserDefaults was called NSUserDefaults and the setters and getters were named slightly differently: Getting let defaults = UserDefaults.standard Setting let defaults = UserDefaults.standard 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. The UserDefaults class provides convenience methods for accessing common types such as floats, doubles, integers, Boolean values, and URLs. Print("First element in array \(friendsNamesArray)")įor more Swift code examples and tutorials, please check the Swift Code Examples page on this website.The simplest solution for storing a few strings or common types is UserDefaults. Print("Friends names Array count \(unt)") Let friendsNamesArray = defaults.object(forKey: "friendsNames") as? () Print("Current date value = \(currentDateValue)") Let currentDateValue = defaults.object(forKey: "currentDate") as! NSDate Print("First Name value = \(firstNameValue)") Let firstNameValue = defaults.object(forKey: "firstName") as! String Print("distance value = \(distanceValue)") Let distanceValue = defaults.double(forKey: "distance") Print("isUserActive value = \(isUserActive)") Let isUserActive = defaults.bool(forKey: "isActive") Let weightValue = defaults.integer(forKey: "weight") Create a global instance of NSUserDefaults classĭt("Sergey", forKey: "firstName")ĭt(NSDate(), forKey: "currentDate")ĭt(friendsNames, forKey: "friendsNames") If you are interested in video lessons on how to write Unit tests and UI tests to test your Swift mobile app, check out this page: Unit Testing Swift Mobile App Using NSUserDefaults in Swift. User Registration, Log in, Log out – Video Tutorials.
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