How to use ForEach on a NSSet generated by CoreData in SwiftUI

Question

I generated a CoreData model with some 1-to-many relationships. Now I want to use a ForEach on this relationship which is a NSSet, then I'm getting the following error:

Generic struct 'ForEach' requires that 'NSSet' conform to 'RandomAccessCollection'

My code looks like this:

struct DetailView: View {
    var sample: Sample

    var body: some View {
        VStack {
            ForEach(sample.stepps!, id: \.self) { step in
                ...
            }
        }
    }
}

How to solve this?

Are you sure you want `ForEach` instead of `forEach`? – Dai Mar 28 '20 at 11:46 — Dai, Mar 28 '20 at 11:46
forEach does not work in SwiftUI – gurehbgui Mar 28 '20 at 11:49 — gurehbgui, Mar 28 '20 at 11:49

score 9 · Accepted Answer · answered Mar 28 '20 at 12:09

9

Here is possible approach

ForEach(Array(sample.stepps! as Set), id: \.self) { step in
    // step is NSObject type, so you'll need it cast to your model
}

answered Mar 28 '20 at 12:09

Asperi

228,894
20
464
690

...and if you have a slider inside you want to access like with a Slider(step.percentage) ? ... – user1568220 Apr 05 '22 at 21:04
but this solution does not work in the cases of a Set that will change – LostBalloon Dec 07 '22 at 22:15

score 0 · Answer 2 · answered Jun 15 '22 at 12:15

0

if let steps = sample.steps?.allObjects as? [Step] {
  ForEach(steps) {step in
    Text("\(step.title ?? "step")")
  }
}

answered Jun 15 '22 at 12:15

Sifan

9
1

How to use ForEach on a NSSet generated by CoreData in SwiftUI

2 Answers2