How to conform UIImage to Codable?

Question

Swift 4 has Codable and it\'s awesome. But UIImage does not conform to it by default. How can we do that?

I tried with singleValueContainer

Answer 1

One way to pass an UIImage is to convert it to something that conforms to Codable, like String.

To convert the UIImage to String inside func encode(to encoder: Encoder) throws:

let imageData: Data = UIImagePNGRepresentation(image)!
let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)
try container.encode(strBase64, forKey: .image)

To convert the String back to UIImage inside required init(from decoder: Decoder) throws:

let strBase64: String = try values.decode(String.self, forKey: .image)
let dataDecoded: Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
image = UIImage(data: dataDecoded)