Swift: How to store user preferences? [closed]

Question

I am still very new to iOS development and swift and am not sure if I'm overthinking this. I am currently working on an application that upon opening requires the user to enter their login credentials. This gets tedious and frustrating because every time the app is closed and opened again the user has to sign in. Is there a simple way to make the program remember if a user is already signed in?

I was looking into CoreData but every example involves storing a new object every time and requires a query of some sort to fetch the information. Where as all I really need is a bool isLoggedIn and an int for the stored user ID.

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Edit:

NSUserDefaults is exactly what I was looking for.

Answer 1

You can use NSUserDefaults to save information and retrieve it next time when the app launches.

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/index.html

For example:

NSUserDefaults.standardUserDefaults().setObject("mynameisben", forKey: "username")  let userName = NSUserDefaults.standardUserDefaults().stringForKey("username") 

Update for Swift 3+

UserDefaults.standard.set("mynameisben", forKey: "username")  let userName = UserDefaults.standard.string(forKey: "username") 

Answer 2

Use NSUserDefaults

Let defaults = NSUserDefaults.standardUserDefaults() defaults.setObject("User", forKey: "userName") 

Check if User name exists when application is started in your AppDelegate.swift

didFinishLaunchingWithOptions 

If username exists, skip login page

To check if NSUserDefaults is nil

if (defaults.objectForKey(userName) != nil) {  // Skip Login  } else {// Show login  }