SwiftUI ForEach Change Data Used

Question

I'm working on an app that will display some data I have collected into a Chart. Since there's quite a few different arrays I want to use, I want to be able to update the ForEach inside the chart to display the chosen array from a picker, but I'm not sure how to turn this string selectedset into something the ForEach can read and recognise as an array. Does anyone know how to do this?

private var dataSet1 = [/* set1 elements here */]
private var dataSet2 = [/* set2 elements here */]

@State private var selectedSet = dataSet1

var body: some View {
    Chart {
        ForEach(selectedSet, id: \.id) { data in 
            // REST OF FOREACH STUFF HERE
        }
        // Other Chart components or modifications can be added here
    }
}

I tried a couple different things, including putting selectedset into the ForEach by itself but it still didn't work.

Answer 1

As you haven't mentioned whether the data type is the same or not for each array, two cases are possible. You can handle something like this.

Case 1: If DataType is same for each array

private var dataSet1: [DataType] = [/* set1 elements here */]
private var dataSet2: [DataType] = [/* set2 elements here */]

@State private var selectedSetType = dataSet1
@State private var selectedDataSet: [DataType] = []

var body: some View {
    Chart {
        ForEach(selectedDataSet, id: \.id) { data in 
            // REST OF FOREACH STUFF HERE
        }
    }
}


func updateSelectedArray() {
    switch selectedSetType {
    case dataSet1:
        selectedDataSet = dataSet1
    case dataSet2:
        selectedDataSet = dataSet2
    // Add more cases for additional datasets if needed
    default:
        break
    }
}

Case 2: If DataType is different for each array

@State private var dataSet1: [DataType1] = [/* set1 elements here */]
@State private var dataSet2: [DataType2] = [/* set2 elements here */]

@State private var selectedSet = dataSet1

var body: some View {
    Chart {
        switch selectedSet {
        case let dataSet1 as [DataType1]:
            ForEach(dataSet1, id: \.id) { data in 
                // FOREACH STUFF
            }
        case let dataSet2 as [DataType2]:
            ForEach(dataSet2, id: \.id) { data in 
                // FOREACH STUFF
            }
        default:
            break
        }
    }
}