12/21/2023 0 Comments Swift json decode![]() date, etc, with the actual values as associated. Make your data types encodable and decodable for compatibility with external representations such as JSON. (Typically, such libraries will return values of an enum with cases like. Employee contains a Toy property it’s a nested type. Time for your first encoding and decoding challenge Encoding and Decoding Nested Types. useDefaultKeys) -> T catch DecodingError. This tends to involve a fair amount of grunt work, so you can look for one of the Swift JSON decoder libraries on (say) GitHub for something that does much of the work for you. Add a JSONEncoder and a JSONDecoder to handle JSON encoding and decoding of toys and employees: let encoder JSONEncoder() let decoder JSONDecoder() That’s all you need to work with JSON. ![]() deferredToDate, keyDecodingStrategy: JSONDecoder.KeyDecodingStrategy =. I’ll show you the code first, then explain how it works.įunc decode(_ type: T.Type, from file: String, dateDecodingStrategy: JSONDecoder.DateDecodingStrategy =. It’s such a common thing to do that I have an extension to make the process easier. ![]() The (partial) output of the first dump is below: You can see that the decoding worked properly. If you want to load some JSON from your app bundle when your app runs, it takes quite a few lines of code: you need to get the URL from your bundle, load it into a Data instance, try decoding it, then catch any errors. To encode and decode our enum, we follow the usual procedures: We create the JSONEncoder and the JSONDecoder and we use the usual encode () and decode () methods. How to decode JSON from your app bundle the easy way ![]()
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