![]() If your tool bar is missing, just hit Option-Command-T, or go to View -> Show Toolbar.ĭelete all the code in the playground and replace it with import Foundation. You can open the tab by clicking the top right button on the tool bar. This solves a common error where the playground never compiles or runs. ![]() Once created, open the identity tab and confirm that Playground Settings are set to macOS. Go ahead and create a fresh playground so we can test how much and what types of data can be stored without distractions. Before we continue defining and analyzing user defaults, let's quickly see how they work in a playground. The user defaults are best used in small ways, but they can be quite vast. The parameters are referred to as defaults because they’re commonly used to determine an app’s default state at startup or the way it acts by default. Apps store these preferences by assigning values to a set of parameters in a user’s defaults database. For example, you can allow users to specify their preferred units of measurement or media playback speed. ![]() "User defaults are an interface to the user’s defaults database, where you store key-value pairs persistently across launches of your app."Īccording to Apple, the defaults system allows an app to customize its behavior to match a user’s preferences. I follow Apple's documentation closely in this article, often quoting directly, so if you'd like to first look through their documentation follow the link at the bottom of the article. In this article, we will cover what user defaults are, how to use them, and why to use them. One of the easiest ways to store data locally is with user defaults. ![]()
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