Now, here's a curiosity that's worth explaining briefly: in Swift, strings, arrays and dictionaries are all structs, not objects. You can also use the set() to store strings, arrays, dictionaries and dates. Here are some examples: let defaults = UserDefaults.standard These values nearly always have no meaning outside of what you use them for, so just make sure the key names are memorable. Once that's done, it's easy to set a variety of values – you just need to give each one a unique key so you can reference it later. To get started with UserDefaults, you create a new instance of the class like this: let defaults = UserDefaults.standard You might find it useful to create a fresh Single View App project just so you can test out the code. ![]() If you think your saved data would take up more than say 100KB, UserDefaults is almost certainly the wrong choice.īefore we get into modifying project 10, we're going to do a little bit of test coding first to try out what UserDefaults lets us do. This makes using it really easy, but you need to know that it's a bad idea to store lots of data in there because it will slow loading of your app. ![]() ![]() When you write data to UserDefaults, it automatically gets loaded when your app runs so that you can read it back again. You can write basic types such as Bool, Float, Double, Int, String, or URL, but you can also write more complex types such as arrays, dictionaries and Date – and even Data values. You can use UserDefaults to store any basic data type for as long as the app is installed.
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