Using Reflections API (Mirror) with SwiftUI?

[nogi]

Hi,

I am new to SwiftUI and am wanting to iterate over a class and present in a view the keyname and keyvalue. I understand from googling that I need to use something like the reflections API to achieve this but am struggling to convert the swift example to work with swiftui.

My current non-working code:

import SwiftUI

struct ShowClassData: View {
    @ObservedObject var myClass : MyClass
    
    var body: some View {
        VStack{
            var mirror = Mirror(reflecting: myClass)
            
            mirror.children.forEach({
                Text("\(child.label): \(child.value)")
            })
        }
    }
}

Get this error:

• Type '()' cannot conform to 'View'; only struct/enum/class types can conform to protocols

I've also tried the following with no luck:

for case let (label?, value) in mirror.children {
    print (label, value)
}

Different error:

• Closure containing control flow statement cannot be used with function builder 'ViewBuilder'

[Max_Desiatov]

The problem is that mirror.children.forEach does not return anything that conform to the SwiftUI View protocol, in fact it doesn't return anything as forEach is a void-returning function. You should use ForEach instead:

struct ShowClassData: View {
    @ObservedObject var myClass : MyClass

    var body: some View {
        VStack {
            let mirror = Mirror(reflecting: myClass)
            ForEach(Array(mirror.children), id: \.label) { child in
                Text("\(child.label!): \(String(describing: child.value))")
            }
        }
    }
}

[nogi]

@Max_Desiatov

    var body: some View {
        VStack {
            let mirror = Mirror(reflecting: myClass)
            ForEach(Array(mirror.children), id: \.label) { child in
                Text("\(child.label!): \(String(describing: child.value))")
            }
        }
    }
}

Oh that's awesome thank you. Now, all I need to do is clean that output up as it's not very user friendly.

[(label: Optional("_varA1_completeDate"), value: Combine.Published<Swift.Optional<Foundation.Date>>(storage: Combine.Published<Swift.Optional<Foundation.Date>>.Storage.value(Optional(2021-01-15 09:41:07 +0000)))), (label: Optional("_varA2_images"), value: Combine.Published<Swift.Array<SwiftUI.Image>>(storage: Combine.Published<Swift.Array<SwiftUI.Image>>.Storage.value([SwiftUI.Image(provider: SwiftUI.ImageProviderBox<__C.UIImage>)]))), (label: Optional("_varA2_completeDate"), value: Combine.Published<Swift.Optional<Foundation.Date>>(storage: Combine.Published<Swift.Optional<Foundation.Date>>.Storage.value(Optional(2021-01-15 09:41:12 +0000)))), (label: Optional("_varA2_switchesOff"), value: Combine.Published<Swift.Bool>(storage: Combine.Published<Swift.Bool>.Storage.value(true))), (label: Optional("_varA3_completeDate"), value: Combine.Published<Swift.Optional<Foundation.Date>>(storage: Combine.Published<Swift.Optional<Foundation.Date>>.Storage.value(nil))), (label: Optional("_varA4_completeDate"), value: Combine.Published<Swift.Optional<Foundation.Date>>(storage: Combine.Published<Swift.Optional<Foundation.Date>>.Storage.value(Optional(2021-01-15 09:41:13 +0000)))), (label: Optional("_varA5_completeDate"), value: Combine.Published<Swift.Optional<Foundation.Date>>(storage: Combine.Published<Swift.Optional<Foundation.Date>>.Storage.value(Optional(2021-01-15 09:41:14 +0000)))), (label: Optional("_varA6_completeDate"), value: Combine.Published<Swift.Optional<Foundation.Date>>(storage: Combine.Published<Swift.Optional<Foundation.Date>>.Storage.value(Optional(2021-01-15 09:41:15 +0000))))]