SwiftUI中模态视图编辑后主视图未更新问题求助

1. 确保ViewModel通过@Published触发视图刷新 #

TransferListViewModel作为ObservableObject，必须用**@Published**标记需要监听的数据属性，否则数据更新无法通知视图刷新。示例：

class TransferListViewModel: ObservableObject {
    @Published var transfers: [Transfer] = []
    
    init() {
        fetch()
    }
    
    func fetch() {
        // 模拟数据请求，更新@Published属性时自动通知视图
        self.transfers = NetworkService.getTransfers()
    }
}

2. 保证模态视图使用同一个ViewModel实例 #

如果模态视图新建了独立的TransferListViewModel实例，调用更新函数只会修改该实例的数据，和TransferFlowView的ViewModel无关。需传递同一个实例：

struct TransferFlowView: View {
    @ObservedObject var transferListVM = TransferListViewModel()
    @State private var showModal = false
    
    var body: some View {
        Button("打开模态") {
            showModal = true
        }
        .sheet(isPresented: $showModal) {
            // 传递当前ViewModel给模态视图
            TransferModalView(viewModel: transferListVM)
        }
    }
}

struct TransferModalView: View {
    let viewModel: TransferListViewModel
    @Environment(\.dismiss) private var dismiss
    
    var body: some View {
        Button("提交更新") {
            viewModel.fetch()
            dismiss()
        }
    }
}

3. 手动发送变更通知（兜底方案） #

若@Published未正常触发，可在更新函数里手动发送变更信号：

class TransferListViewModel: ObservableObject {
    @Published var transfers: [Transfer] = []
    
    func updateData() {
        // 手动通知视图即将变更
        objectWillChange.send()
        fetch()
    }
}

4. 检查.onChange的监听逻辑 #

如果使用.onChange，需确保监听的是ViewModel的@Published属性：

struct TransferFlowView: View {
    @ObservedObject var transferListVM = TransferListViewModel()
    
    var body: some View {
        List(transferListVM.transfers) { transfer in
            Text(transfer.name)
        }
        .onChange(of: transferListVM.transfers) { _ in
            // 数据变化时的额外逻辑（正常@Published已自动刷新视图）
        }
    }
}

内容的提问来源于stack exchange，提问作者Manjunath