NSUserDefaults example in Swift

This code example demonstrates how to write and read from NSUserDefaults in Swift. The code example below will cover how to:

• Create a global instance of NSUserDefaults
• Write and read the following data types from NSUserDefaults:
  • Integer
  • Boolean
  • Double
  • Objects like String, Date and Array of elements

Using NSUserDefaults in Swift. Code Example.

// Create a global instance of NSUserDefaults class
 let defaults = UserDefaults.standard
 
 // Storing Values of different times
 defaults.set(15, forKey: "weight")
 defaults.set(true, forKey: "isActive")
 defaults.set(25.8, forKey: "distance")
 defaults.set("Sergey", forKey: "firstName")
 defaults.set(NSDate(), forKey: "currentDate")
 
 let friendsNames = ["Bill", "John"]
 defaults.set(friendsNames, forKey: "friendsNames")
 
 
 // Reading from NSUserDefaults.
 let weightValue = defaults.integer(forKey: "weight")
 print("weight value = \(weightValue)")
 
 let isUserActive = defaults.bool(forKey: "isActive")
 print("isUserActive value = \(isUserActive)")
 
 let distanceValue = defaults.double(forKey: "distance")
 print("distance value = \(distanceValue)")
 
 let firstNameValue = defaults.object(forKey: "firstName") as! String
 print("First Name value = \(firstNameValue)")
 
 
 let currentDateValue = defaults.object(forKey: "currentDate") as! NSDate
 print("Current date value = \(currentDateValue)")
 
 
 let friendsNamesArray = defaults.object(forKey: "friendsNames") as? [String] ?? [String]()
 print("Friends names Array count \(friendsNamesArray.count)")
 print("First element in array \(friendsNamesArray[0])")

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