SwiftUI NavigationLink 立即导航回来 [英] SwiftUI NavigationLink immediately navigates back

问题描述

我正在使用 SwiftUI 在 NavigationView 中创建从行到详细视图的 NavigationLinks(类似于教程 https://developer.apple.com/tutorials/swiftui/building-lists-and-navigation).但是，当我在我的应用程序中进行测试时，NavgiationLink 在被点击后会立即从详细视图导航回上一个视图(详细视图仅显示一秒钟).

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).

代码如下:

struct ItemsView: View {
    var body: some View {
        NavigationView {
            VStack {
                List {
                    ForEach(Query.items) { item in
                        NavigationLink(destination: ItemDetail(item: item)) {
                            ItemRow(item: item)
                        }
                    }
                }
                Spacer()
            }
            .navigationBarTitle(Text("Items"))
        }
    }
}

private struct ItemRow: View {
    var item: Item

    var body: some View {
        VStack(alignment: .leading) {
            Text(item.title)
                .font(.headline)
            item.completionDate.map({
                Text("Created ($0.shortDateTime)")
            })
            item.completionDate.map({
                Text("Active (Date().offsetString(from: $0)) ago")
            })
        }
    }
}

struct ItemDetail: View {
    var item: Item

    var body: some View {
        VStack {
            Text("(item.title)")
            Text("(String(describing: item.creationDate))")
            Text("(String(describing: item.completionDate))")
            Text("(item.complete)")
        }
        .navigationBarTitle(Text("Item"), displayMode: .inline)
    }
}

Query 是使用 Realm 完成的:

let realm = try! Realm()

class Query {
    static let items = realm.objects(Item.self)
}

这似乎是从 realm.objects(Item.self) 返回的 Results 对象的问题.当我使用 let items = [Item(), Item()] 然后调用 ForEach(items) { ... } 对静态数据进行尝试时，导航起作用了正如预期的那样.

It seems like this could be a problem with the Results<Item> object that is return from realm.objects(Item.self). When I tried it with static data using let items = [Item(), Item()] and then calling ForEach(items) { ... }, the navigation worked as expected.

推荐答案

通过将 ForEach(Query.items) 更改为 ForEach(Array(Query.items)) 使数据静态化.

Fixed it by changing ForEach(Query.items) to ForEach(Array(Query.items)) to make the data static.

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