Updated: 3rd September 2017. Checked syntax using Xcode 9.0 beta 6. Added section on allowing for nulls. Since JSON has become the de facto standard for data transfers around the internet, there has always been a lot of interest in Swift libraries to parse JSON into Swift classes or structs. Searching for “swift json library” on. 04/11/2017 · This is to keep in mind that Codable Protocol has been included in Swift Standard library In Swift 4, Which means you can use this in the apps with minimum target from iOS 7 Another feature of Swift 4 is the introduction of multiple line string which makes it very easy for you to use custom strings like JSON directly.

You can take your Swift String, Int, Double, URL, Date, Data, Array and Dictionary values, and encode them as JSON. Using JSON before Swift 4 was a bit of a PITA. You’d have to serialize the JSON yourself, and then type cast every property of the JSON to the right Swift type. I'm new to Swift and I started working on a Swift 4 project with a PHP server. I use Alamofire for requests, and print the data using print. This is is what i'm getting: "error":. how to convert JSON dictionary to string value in swift 4. Ask Question Asked 8 months ago. //Swift 4.0 struct Person:Decodable let id: Int let name: String let imageUrl: String //CodingKeys private enum CodingKeys: String, CodingKey case imageUrl = "image_url" case id, name Above in Swift 4.0 we were able to parse out JSON with camelCase using CodingKeys. In Swift 4.1 it has become even more easier and quicker. 20/02/2017 · Many basic types in the Swift Standard Library and Foundation types for example, String and URL are codable by default. Note: You can encode codable types to various formats such as Property Lists PLists, XML or JSON, but for this tutorial you’ll only work with JSON. 01/07/2017 · Transforming JSON into model objects in your apps just became a whole lot easier with the introduction of Decodable in Swift 4. In today's lesson, I want to walk through the old way of using JSONSerialization and then show you the new JSONDecoder method. We can retire a bunch of JSON.

To convert this JSON string to a Beer instance, we’ll mark our types as Codable. Codable is actually what Swift calls a protocol composition type, consisting of Encodable & Decodable, so if you only care about unidirectional conversion you can just adopt the appropriate protocol. This is a new feature of Swift 4. 29/06/2017 · Apple announced Swift 4 in WWDC. You will learn what's new and changes in Swift 4 by going through the examples. The Codable protocol is a great addition.