Decoding pictures in Swift doesn't work in Swift

Question

I have a problem here. I have an array with custom objects, that contain pictures. When i install my app to my phone all pictures are at their place, but when i try to save changes to my array with UserDefaults - all is saving, except pictures. I have found tha the problem is with decoding pictures. They all change to placeholder picture. Can anybody help me and say whats wrong?

 required init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)
    englishWord = try container.decode(String.self, forKey: .englishWord)
    belarusianWord = try container.decodeIfPresent(String.self, forKey: .belarusianWord) ?? ""
    englishDefinition = try container.decodeIfPresent(String.self, forKey: .englishDefinition) ?? ""
    belarusianDefinition = try container.decodeIfPresent(String.self, forKey: .belarusianDefinition) ?? ""

    let data = try container.decodeIfPresent(Data.self, forKey: CodingKeys.wordImage)
    if let data = data {
        guard let wordImage = UIImage(data: data) else {
            throw NSError(domain: "Error decoding logo", code: 0, userInfo: nil)
        }
        self.wordImage = wordImage
    } else {
        wordImage = UIImage(named: "placeholder")!
    }
}

public func encode(to encoder: Encoder) throws {
    var container = encoder.container(keyedBy: CodingKeys.self)
    let data = UIImage().pngData()
    try container.encode(data, forKey: CodingKeys.wordImage)
    try container.encode(self.englishWord, forKey: .englishWord)
    try container.encode(self.belarusianWord, forKey: .belarusianWord)
    try container.encode(self.englishDefinition, forKey: .englishDefinition)
    try container.encode(self.belarusianDefinition, forKey: .belarusianDefinition)
}

Answer 1

In encode(to:) method, simply replace

let data = UIImage().pngData()

with

let data = self.wordImage.pngData()