这是一个非常奇怪的问题,因为我无法使用隔离的代码进行复制,但是我希望有人可以考虑一下原因。我有一个视图,假设ContentView的ContentViewModel是ObservedObject,然后还有另一个View ContentView2。而且我们在ContentView中有NavigationView,它将导航链接包装到ContentView2。这有点怪异,但是当我们进行一些会影响ContentViewModel的更改时,NavigationView会弹出ContentView2,以便最终显示在最初的ContentView中,但是我们并没有执行任何操作,例如关闭ContentView2或点击返回按钮。我有一个与我的项目中使用的代码相似的代码,但是请注意,在此代码中,所有功能都可以正常工作:

func qrealm() -> Realm {
    return try! Realm(configuration: .init( inMemoryIdentifier: "yw"))
}

class SomeRObj: Object {
    @objc dynamic var name: String = ""

    convenience init(name: String) {
        self.init()
        self.name = name
    }

    static var instance: SomeRObj {
        return qrealm().objects(SomeRObj.self).first!
    }
}
struct SomeRObjWrapped: Hashable {
    var obj: SomeRObj
    var prop: Int
}

class ContentViewModel: ObservableObject {
    @Published var someRObj: [SomeRObjWrapped] = []
    var any: Any?
    init() {
        let token = qrealm().objects(SomeRObj.self).observe { changes in
            switch changes {
            case let .initial(data), let .update(data, deletions: _, insertions: _, modifications: _):
                let someObjs = data.map { SomeRObjWrapped(obj: $0, prop: Int.random(in: 1..<50)) }
                self.someRObj = Array(someObjs)
            default: break
            }
        }
        self.any = token
    }
}

struct ContentView: View {
    @ObservedObject var model: ContentViewModel = ContentViewModel()

    var body: some View {
        NavigationView {
        VStack {
            ForEach(model.someRObj, id: \.self) { obj in
                Heh(obj: obj.obj, pr: obj.prop)
            }
            NavigationLink(destination: ContentView2()) {
                Text("Link")
            }
        }
        }
    }
}

struct Heh: View {
    var obj: SomeRObj
    var pr: Int
    var body: some View {
        Text("\(obj.name) \(pr)")
    }
}

struct ContentView2: View {
    var body: some View {
        Button(action: { try! qrealm().write {
            let elem = qrealm().objects(SomeRObj.self).randomElement()
            elem?.name = "jotaro kujo"
            }

        }, label: { Text("Toggle") })
    }
}

最佳答案

您可以将\.self替换为\.id:

ForEach(model.someRObj, id: \.id) { obj in
    Heh(obj: obj.obj, pr: obj.prop)
}
然后,每个对象都将由id标识,并且ForEach循环仅在id更改时才会刷新。

关于ios - SwiftUI NavigationView自行弹出,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/63385352/

10-09 05:54