您的 totalScore 属性不是 @Published，因此 SwiftUI 视图不会更新该值变化.

Your totalScore property is not @Published, so the SwiftUI view won't update when the value changes.

试试这个:

final class GameTracker: ObservableObject {
@Published var items: [CompletedChallenge] = []

@Published var totalScore: Int {   // <-- Here!
    items.reduce(0) {$0 + $1.points}
}

func add(_ completedItem: CompletedChallenge) {
    items.append(completedItem)
   }
}
}