Swift UI rotation inside ForEach loop

问题

Excuse the length of this question, but I have a swift UI that has words displayed in concentric circles. I want to be able to press the right and left button and have the words rotate clockwise and counterclockwise respectively. My withAnimation{} button function works as long as the text is not in a ForEach loop. Is there a way to change state variables that are in a ForEach loop? In my case animate a rotation of a view that is within a ForEach. In this case I want to use the slider to pick which level I am rotating.

code: import SwiftUI

struct ContentView: View {
    @State var circle = Circle()

    @State var platform: Float = 0.0

    @State var platformBool = false

    @State var colors = [Color.red, Color.black, Color.orange, Color.white, Color.green, Color.gray, Color.blue]
    @State var colorOne = Color.red

    @State var colorTwo = Color.black

    @State var levelWords = [["A","B","O","R","T","S"], ["B","E","N","I","G","N"], ["A","B","O","R","T","S"], ["B","E","N","I","G","N"], ["A","B","O","R","T","S"], ["B","E","N","I","G","N"]]

    @State var angle = Double(0)

    @State var angles = [Double(0), Double(0), Double(0), Double(0), Double(0), Double(0),]

    @State var radius: CGFloat = 175.0

    var body: some View {

        let rows = (self.levelWords[0].count)
        let columns = (self.levelWords.count)

        let radiiStep: CGFloat = self.radius / CGFloat(self.levelWords[0].count + 1)
        let degreeStep = Double(360 / self.levelWords[0].count)

        func floatValue(one: CGFloat, two: CGFloat, three: Int) -> CGFloat {

            let float = CGFloat(three)
            let floatValue = one - two * float

            return -floatValue

        }

        func degreeValue(one: Double, two: Double, three: Double) -> Double {

            let value = -(one + two * three)

            return value
        }

        return
            VStack {

                ZStack{

                    self.circle
                        .fill(RadialGradient(gradient: Gradient(colors: [Color.black, Color.blue]), center: .center, startRadius: 30, endRadius: 200))

                    ForEach(0..<columns) { column in
                         ForEach(0..<rows) { row in
                            Text("\(self.levelWords[column][row])")
                                .rotationEffect(.degrees(degreeValue(one: self.angles[column], two: Double(row), three: degreeStep)))
                                .offset(y: floatValue(one: self.radius, two: radiiStep, three: column))
                                .rotationEffect(.degrees(self.angles[column] + Double(row) * degreeStep))
                                .foregroundColor(Color.white)
                        }
                    }

                    Text("rot")
                        .rotationEffect(.degrees(self.angles[Int(self.platform)]))
                        .foregroundColor(Color.white)

                }

                Spacer()
                HStack{
                    Spacer()
                    Button("Left") {
                        withAnimation{
                            self.angles[Int(self.platform)] -= Double(360 / self.levelWords[0].count)
                            print(self.angles[Int(self.platform)])
                        }
                    }

                    Spacer()

                    Button("Right") {
                         withAnimation{
                            self.angle += Double(360 / self.levelWords[0].count)
                            print("rotated")
                        }
                    }
                    Spacer()
                }


                Slider(value: $platform, in: 0...5)
                    .padding()

                Text("platform: \(Int(platform))")
                .padding()

            }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

来源：https://stackoverflow.com/questions/61472189/swift-ui-rotation-inside-foreach-loop