For quickly and easily storing variables in your Swift application, UserDefaults is a generally quick and easy way to go. It can be used for just about anything from checking if it is the first time your app has been opened to storing preferences. UserDefaults can be a very simple solution to keeping most data including the types: Object, URL, Array, Dictionary, String, StringArray, Data, Bool, Integer, Float, Double and Dictionary Representation.
The documentation for UserDefaults is located here.
Below is my quick and easy method for storing and retrieving data using the getter and setter methods on variables in Swift 4.
Writing data to UserDefaults is as simple as defining UserDefaults then setting an object for a key.
Getting the saved data from the UserDefaults is just as easy as saving it.
Reading/Writing Both Even Easier
Combining both the saving and retrieving in the get and set on a variable makes the process feel built in. To get the saved value just call the variable as you normally would and to save it back to UserDefaults just set your variable to the new value.