Easiest Way to Persist Data

If your needs are simple, consider this option before moving on to other storage methods.

Saving

 
@IBOutlet weak var nameTextField: UITextField!

...

UserDefaults.standard.setValue(nameTextField.text, forKey: "name")
 

Retrieving

 
if let name = UserDefaults.standard.value(forKey: "name") as? String {
    nameTextField.text = name
}
 

Tips

Save some typing and create a variable to access the defaults:

• let defaults = UserDefaults.standard

You can persist classes too but there is more work to it. May write another post for it.

(Swift 3.0)