String:String? array instead of String:String array breaks ForEach in SwiftUI view?

Question

Here is my array:

class Storages: ObservableObject {
    let storage = Storage.storage()
    let uid = UserAuth().uid ?? "<uid>"
    
    @Published var photos: [String:String?] = [
        "img1": UserDefaults.standard.string(forKey: "img1"),
        "img2": UserDefaults.standard.string(forKey: "img2"),
        "img3": UserDefaults.standard.string(forKey: "img3"),
    ]

And here is my view:

struct EditProfile: View {
    @ObservedObject var storage = Storages()

    var body: some View {
        VStack {
            Text("Points")
            .font(Font.system(size: 21))
            .fontWeight(.bold)
            HStack {
                ForEach(storage.photos.sorted(by: <), id: \.key){ (key,val) in
                    EditableCircleImage(key: key, imgName: val)
                }
            }

If I change by photos dictionary from [String:String?] to [String:String] (by putting in ?? "" to prevent nil value - then it will work. But I want to keep nil values as I need to know when an array item value is nil.

Here is the struct I pass into my for each:

struct EditableCircleImage: View {
    @ObservedObject var storage = Storages()
    let key: String
    let imgName: String?

Any idea why I can't use a [String:String?]?

What do you mean by "breaks"? Compiler error? Run-time error? ... — Asperi
– Asperi, Commented Jun 23, 2020 at 12:56
There isn't really an informative error. It says: Command CompileSwift failed with a nonzero exit code and error: Segmentation fault: 11 (in target 'App' from project 'App') when I run the app - there is no compile time error, Xcode says an internal error occured. Source editor is limited. Attempting to restore functionality... — Zorgan
– Zorgan, Commented Jun 23, 2020 at 12:58
Xcode 12 gives error for sorted(by: <). Did you overload it? If not, that is the reason. — Asperi
– Asperi, Commented Jun 23, 2020 at 13:06

Asperi · Accepted Answer · 2020-06-23 13:10:22Z

1

Try this variant. Tested with some replicated code on Xcode 12b.

ForEach(storage.photos.sorted(by: { $0.key < $1.key }), id: \.key){ (key,val) in
    EditableCircleImage(key: key, imgName: val)
}

answered Jun 23, 2020 at 13:10

Asperi

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1 Comment

Zorgan Over a year ago

Yes this fixes the problem - thankyou. PS: What do you mean by "overloading" in this context?

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