在推送视图中修改列表绑定 属性 时 SwiftUI 导航弹回
SwiftUI Navigation popping back when modifying list binding property in a pushed view
当我从向下 2+ 层的推送视图中的数组更新绑定 属性 时,导航会在更改为 属性 后立即弹出。
Xcode 13.3 测试版,iOS 15.
我创建了一个简单的演示,代码如下。
Shopping Lists
List Edit
List section Edit
更新列表标题(一个视图深度)没问题,导航堆栈保持不变,如果我 return,更改会发布。但是当调整一个部分标题(两个深)时,只要我对 属性.
进行一次更改,导航就会弹出。
我觉得我缺少基本的基础知识,我觉得它一定与列表有关 id
?但我正在努力弄清楚或解决它。
GIF
代码:
型号:
struct ShoppingList {
let id: String = UUID().uuidString
var title: String
var sections: [ShoppingListSection]
}
struct ShoppingListSection {
let id: String = UUID().uuidString
var title: String
}
查看模型:
final class ShoppingListsViewModel: ObservableObject {
@Published var shoppingLists: [ShoppingList] = [
.init(
title: "Shopping List 01",
sections: [
.init(title: "Fresh food")
]
)
]
}
内容视图:
struct ContentView: View {
var body: some View {
NavigationView {
ShoppingListsView()
}
}
}
ShoppingListsView
struct ShoppingListsView: View {
@StateObject private var viewModel = ShoppingListsViewModel()
var body: some View {
List($viewModel.shoppingLists, id: \.id) { $shoppingList in
NavigationLink(destination: ShoppingListEditView(shoppingList: $shoppingList)) {
Text(shoppingList.title)
}
}
.navigationBarTitle("Shopping Lists")
}
}
ShoppingListEditView
struct ShoppingListEditView: View {
@Binding var shoppingList: ShoppingList
var body: some View {
Form {
Section(header: Text("Title")) {
TextField("Title", text: $shoppingList.title)
}
Section(header: Text("Sections")) {
List($shoppingList.sections, id: \.id) { $section in
NavigationLink(destination: ShoppingListSectionEditView(section: $section)) {
Text(section.title)
}
}
}
}
.navigationBarTitle("Edit list")
}
}
ShoppingListSectionEditView
struct ShoppingListSectionEditView: View {
@Binding var section: ShoppingListSection
var body: some View {
Form {
Section(header: Text("Title")) {
TextField("title", text: $section.title)
}
}
.navigationBarTitle("Edit section")
}
}
试试这个,对我有用:
struct ContentView: View {
var body: some View {
NavigationView {
ShoppingListsView()
}.navigationViewStyle(.stack) // <--- here
}
}
尝试让您反对确认 Identifiable
和 return 值是唯一且稳定的,对于您的情况是 ShoppingList
.
当对象 id
更改时,详细视图似乎会弹出。
当我从向下 2+ 层的推送视图中的数组更新绑定 属性 时,导航会在更改为 属性 后立即弹出。
Xcode 13.3 测试版,iOS 15.
我创建了一个简单的演示,代码如下。
Shopping Lists | List Edit | List section Edit |
---|---|---|
更新列表标题(一个视图深度)没问题,导航堆栈保持不变,如果我 return,更改会发布。但是当调整一个部分标题(两个深)时,只要我对 属性.
进行一次更改,导航就会弹出。我觉得我缺少基本的基础知识,我觉得它一定与列表有关 id
?但我正在努力弄清楚或解决它。
GIF
代码:
型号:
struct ShoppingList {
let id: String = UUID().uuidString
var title: String
var sections: [ShoppingListSection]
}
struct ShoppingListSection {
let id: String = UUID().uuidString
var title: String
}
查看模型:
final class ShoppingListsViewModel: ObservableObject {
@Published var shoppingLists: [ShoppingList] = [
.init(
title: "Shopping List 01",
sections: [
.init(title: "Fresh food")
]
)
]
}
内容视图:
struct ContentView: View {
var body: some View {
NavigationView {
ShoppingListsView()
}
}
}
ShoppingListsView
struct ShoppingListsView: View {
@StateObject private var viewModel = ShoppingListsViewModel()
var body: some View {
List($viewModel.shoppingLists, id: \.id) { $shoppingList in
NavigationLink(destination: ShoppingListEditView(shoppingList: $shoppingList)) {
Text(shoppingList.title)
}
}
.navigationBarTitle("Shopping Lists")
}
}
ShoppingListEditView
struct ShoppingListEditView: View {
@Binding var shoppingList: ShoppingList
var body: some View {
Form {
Section(header: Text("Title")) {
TextField("Title", text: $shoppingList.title)
}
Section(header: Text("Sections")) {
List($shoppingList.sections, id: \.id) { $section in
NavigationLink(destination: ShoppingListSectionEditView(section: $section)) {
Text(section.title)
}
}
}
}
.navigationBarTitle("Edit list")
}
}
ShoppingListSectionEditView
struct ShoppingListSectionEditView: View {
@Binding var section: ShoppingListSection
var body: some View {
Form {
Section(header: Text("Title")) {
TextField("title", text: $section.title)
}
}
.navigationBarTitle("Edit section")
}
}
试试这个,对我有用:
struct ContentView: View {
var body: some View {
NavigationView {
ShoppingListsView()
}.navigationViewStyle(.stack) // <--- here
}
}
尝试让您反对确认 Identifiable
和 return 值是唯一且稳定的,对于您的情况是 ShoppingList
.
当对象 id
更改时,详细视图似乎会弹出。