SwiftUI。有没有办法在点击时只折叠一个按钮，而不是所有的按钮

Question

我在滚动视图里面添加了三个按钮，我想在用户点击按钮的时候得到这样的效果--只有这个按钮被点击，而不是每个按钮都被点击，这样隐藏的描述只出现在被点击的按钮上。

还有代码。

struct WordCells: View {
    @State private var toggleView = false
    var numberOfItems = Int.init()
    var body: some View {
        GeometryReader { geometry in
            VStack(spacing: 40.0) {
                ForEach(0..<self.numberOfItems) {item in
                    Button(action: {
                        withAnimation(.easeInOut(duration: 0.5)) {
                            self.toggleView.toggle()
                       }
                   })
                   {
                    VStack {
                       HStack {
                            Text("Button Text")
                                .fontWeight(.bold)
                                .foregroundColor(.black)
                                .font(.callout)

                            Spacer()

                            Text("Description")
                                .fontWeight(.bold)
                                .foregroundColor(.customLabel)
                                .font(.callout)
                            }
                        if self.toggleView {
                            HiddenDescriptionView()
                        }
                       }
                       .frame(width: geometry.size.width/1.3)
                   }

                   .padding(23.0)
                   .background(Color.white)

               }
                .clipShape(RoundedRectangle(cornerRadius: 32))
                .shadow(color: .customLabel, radius: 15)
           }
        }
    }
}

Answer 1

这里有一个解决方案。用Xcode 11.4 iOS 13.4进行测试

struct WordCells: View {
    @State private var toggleView: Int? = nil  // << selection
    var numberOfItems = Int.init()
    var body: some View {
        GeometryReader { geometry in
            VStack(spacing: 40.0) {
                ForEach(0..<self.numberOfItems) {item in
                    Button(action: {
                        withAnimation(.easeInOut(duration: 0.5)) {
                            if self.toggleView == item { // << here !!
                                self.toggleView = nil
                            } else {
                                self.toggleView = item
                            }
                       }
                   })
                   {
                    VStack {
                       HStack {
                            Text("Button Text")
                                .fontWeight(.bold)
                                .foregroundColor(.black)
                                .font(.callout)

                            Spacer()

                            Text("Description")
                                .fontWeight(.bold)
                                .foregroundColor(.gray)
                                .font(.callout)
                            }
                        if self.toggleView == item { // << selection !!
                            HiddenDescriptionView()
                        }
                       }
                       .frame(width: geometry.size.width/1.3)
                   }

                   .padding(23.0)
                   .background(Color.white)

               }
                .clipShape(RoundedRectangle(cornerRadius: 32))
                .shadow(color: .gray, radius: 15)
           }
        }
    }
}