I've finished this app completely, and everything work perfectly... execpt none of the data will save. I've been looking for my error for almost two hours, but I can't find anything. If someone could help me out that would be amazing!

Project Files

@Published var items = [ExpenseItem]() {
        didSet {
            let encoder = JSONEncoder()

            if let encoded = try? encoder.encode(items) {
                UserDefaults.standard.set(encoded, forKey: "Items")
            } else {
                fatalError()
            }
        }
    }

It looks like your saving via UserDefaults is taking place within the didSet observer of a @Published property. Make sure you have upgraded to Xcode 11.5, as it fixes an issue where didSet property observers would not fire on @Published properties.

Xcode 11.5 is still in beta, but it's very helpful to know it's not an error on my behalf. Thanks!

I'll will revisit the project when 11.5 is released and update this post. More to come.

I just tested the new Xcode 11.5 update and UserDefaults is working again!