![]() The work is repeated each time we want to store or read object data. Decode Data back to Contact using JSONDecoder. In the developing iOS app process, when I use UserDefaults without using RxSwift, I realize it taking much time to do.Make an object conforms to the Codable protocol.In this article, we will cover what user defaults are, how to use them, and why to use them. We can convert an object to Data in three steps. One of the easiest ways to store data locally is with user defaults. storing object in user defaults swift Ask Question Asked 5 years, 8 months ago Modified 2 years, 8 months ago Viewed 4k times Part of Mobile Development Collective 0 I'm new to swift and trying to figure out the best way to store user defaults. ![]() Other Objectsįor non-property-list objects, we have to convert them to Data before saving them to UserDefaults.ĭata is also one of the Property-List objects. Sponsor and reach thousands of iOS developers. You can easily support by checking out this sponsor. We can also save an array of Dictionary if the key and value of the dictionary are supported types. array (forKey : "array" ) as ? ] Array of Dictionaries We can also save an array of Array if the inner one is an array of a supported type. stringArray (forKey : "names" ) Array of Arrays If you use this method, you don't need to cast the returning data to. When to Use UserDefaults When the user last updated the app, and you can then show a message to update the app to a better supported version When the last. func stringArray (forKey defaultName : String ) -> ? func array (forKey defaultName : String ) -> ?īut just for an array of strings, UserDefaults offers the dedicated method for retrieving an array of strings, stringArray(forKey:). That's because array(forKey:) returns an optional array of Any type ( ?). ![]() So far, we have to cast our Array to an appropriate type manually. array (forKey : "dates" ) as ? String Array you need to set the actual food directly somewhere (e.g. array (forKey : "booleans" ) as ? Date Array it seems your problem is you never save those values into the user defaults, because adding a new item to the array does not call the setter. You can also read and write other number types, e.g., Float and Double. We can easily read and write an array for supported data types via the setter and getter methods.
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