swiftui-navigationlink

来源： https://stackoverflow.com/questions/62788298/why-does-onappear-execute-twice-when-placed-on-elements-inside-a-navigationvie

来源： https://stackoverflow.com/questions/63497247/switui-two-navigationlink-in-a-list

来源： https://stackoverflow.com/questions/63497247/switui-two-navigationlink-in-a-list

问题 I have a List with NavigationLinks. List { ForEach(items, id: \.id) { item in NavigationLink(destination: ItemView(), tag: item.id, selection: self.$viewModel.selectedItemId) { Text("Some text") } } .onDelete(perform: delete) } .id(UUID()) And a corresponding ViewModel which stores the selected item's id. class ViewModel: ObservableObject { @Published var selectedItemId: String? { didSet { if let itemId = selectedItemId { ... } } } ... } The problem is that when I use NavigationLink

问题 I have a List with NavigationLinks. List { ForEach(items, id: \.id) { item in NavigationLink(destination: ItemView(), tag: item.id, selection: self.$viewModel.selectedItemId) { Text("Some text") } } .onDelete(perform: delete) } .id(UUID()) And a corresponding ViewModel which stores the selected item's id. class ViewModel: ObservableObject { @Published var selectedItemId: String? { didSet { if let itemId = selectedItemId { ... } } } ... } The problem is that when I use NavigationLink

问题 I have a List with NavigationLinks. List { ForEach(items, id: \.id) { item in NavigationLink(destination: ItemView(), tag: item.id, selection: self.$viewModel.selectedItemId) { Text("Some text") } } .onDelete(perform: delete) } .id(UUID()) And a corresponding ViewModel which stores the selected item's id. class ViewModel: ObservableObject { @Published var selectedItemId: String? { didSet { if let itemId = selectedItemId { ... } } } ... } The problem is that when I use NavigationLink

问题 Trying to build deep linking into a list of NavigationList items; I will be reading a value on the SwiftUI view's .onAppear and based on that value, navigate to a specific cell. There are three issues that come up with different setups I have tried: (1) with the below code, navigation doesn't happen at all, (2) if it does navigate, it will immediately pop back, (3) if programmatic navigation works and it doesn't pop back, the manual navigation doesn't work. I have tried this with a Binding

问题 I am using SwiftUI to create NavigationLinks from rows to detail views in a NavigationView (similar to what is being done in the tutorial https://developer.apple.com/tutorials/swiftui/building-lists-and-navigation). However, when I test in my app, the NavgiationLink immediately navigates back from the detail view to the previous view after being tapped (the detail view only shows up for only a second). Here's the code: struct ItemsView: View { var body: some View { NavigationView { VStack {

问题 I have a multi-level dictionary that I need use to build navigation links. Now I have a 2-level depth dictionary: let multiDimDict: [String: [[String: [String]]]] = ["A": [["A1": ["A11", "A12"]], ["A2": ["A21", "A22"]]], "B": [["B1": ["B11", "B12"]], ["B2": ["B21", "B22"]]] ] I can build the navigation view with all navigation links. However, I feel that I am somehow repeating some code in building navigation links. The question is, if I have a many-level dictionary, say 10-level, I don't

问题 I want to programmatically be able to navigate to a link within a List of NavigationLinks when the view appears (building deep linking from push notification). I have a string -> Bool dictionary which is bound to a custom Binding<Bool> inside my view. When the view appears, I set the bool property, navigation happens, however, it immediately pops back. I followed the answer in SwiftUI NavigationLink immediately navigates back and made sure that each item in the List has a unique identifier,