snapshot_ui_testing.swift

struct SnapshotUITest<T: PreviewProvider>: View {
  var navigationBarIsHidden = false
  var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      Text(verbatim: "\(T.self)")
        .font(.title3)

      VStack(alignment: .leading) {
        ForEach(T._allPreviews.indices, id: \.self) { index in
          let preview = T._allPreviews[index]
          NavigationLink {
            if navigationBarIsHidden {
              preview.content
                .navigationBarBackButtonHidden()
            } else {
              preview.content
            }
          } label: {
              Text(verbatim: "\(T.self)_\(index)")
                .accessibilityLabel(Text(verbatim: "\(T.self)_\(index)"))
                .font(.body)
                .foregroundStyle(Color.accentColor)
          }
          .buttonStyle(.plain)
        }
        Divider()
      }
      .frame(maxWidth: .infinity)
    }
    .padding()
  }
}

使用例

struct SnapshotUITestPage: View {
  var body: some View {
    NavigationView {
      ScrollView {
        VStack(alignment: .leading) {
          SnapshotUITest<RetryPage_Previews>(navigationBarIsHidden: true)
          SnapshotUITest<PromotionStartPage_Previews>()
        }
        .navigationLinkIndicatorVisibility(.visible)
      }
      .listStyle(.plain)
    }
  }
}