Question

我具有以下视图层次结构

Nurse List View > Nurse Card > Favorite button

护士列表视图

struct NurseListView: View {
    @State var data: [Nurse] = []

    var body: some View {
        List {
            ForEach(data.indices, id: \.self) { index in
                NurseCard(data: self.$data[index])
            }
        }
    }
}

护士卡

struct NurseCard: View {
    @Binding var data: Nurse
        
    var body: some View {
        FavoriteActionView(data:
            Binding(
                get: { self.data },
                set: { self.data = $0 as! Nurse }
            )
        )
    }
}

收藏夹操作视图

struct FavoriteActionView: View {
    @Binding var data: FavoritableData
    
    var body: some View {
        Button(action: {
            self.toggleFavIcon()
        }) {
            VStack {
                Image(data.isFavorite ? "fav-icon" : "not-fav-icon")                    
                Text(String(data.likes.count))
            }
        }
    }
    
    private func toggleFavIcon() {
        if data.isFavorite {
            if let index = data.likes.firstIndex(of: AppState.currentUser.uid) {
                data.likes.remove(at: index)
            }
        } else {
            data.likes.append(AppState.currentUser.uid)
        }
    }
}

执行toggleFavIcon时，它会从数据对象的likes属性中添加/删除用户ID，但是除非返回上一页并重新打开页面，否则看不到更改。我在这里想念什么？

Answer 1

正如Asperi所写，在这里使用ObservableObject可以很好地工作。像这样：

elements = (1..3).map do |x|
  b.element(
   xpath: '/html/body/form/div[3]/div[6]/table/tbody/tr/td/div[2]/div[3]/div[3]/div/div/div[1]/table/tbody/tr[%d]/td[13]/span' % x
  )
end.select(&:exists?)

为什么.append不会重新加载swiftUI视图

1 个答案: