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SwiftUI VStack 间距:无法正常工作

[英]SwiftUI VStack spacing: not working properly

我有一个 SwiftUI VStack,它位于一个滚动视图、一个几何阅读器和一个导航视图内,代码如下:

struct RezeptList: View {

    @Environment(\.colorScheme) var colorScheme: ColorScheme
    @EnvironmentObject private var recipeStore: RecipeStore

    @State private var searching = false
    @State private var searchText = ""
    @State private var showingAddRecipeView = false

    var body: some View {
        NavigationView{
            GeometryReader { geo in
                ScrollView {
                    SearchBar(searchText: self.$searchText, isSearching: self.$searching)
                    VStack(spacing: 30) {

                        ForEach(self.recipeStore.recipes.filter{$0.name.hasPrefix(self.searchText) || self.searchText == ""}) {recipe in
                            NavigationLink(destination:
                            RezeptDetail(recipe: recipe).environmentObject(self.recipeStore)) {
                                Card(rezept: recipe,width: geo.size.width - 20)
                            }
                            .buttonStyle(PlainButtonStyle())
                        }

                        .navigationBarItems(trailing: Button(action: {
                            self.showingAddRecipeView = true
                        }){
                            Image(systemName: "square.and.pencil")
                                .foregroundColor(.primary)
                            }
                        .padding()
                        )
                    }
                    .padding(.bottom)
                    .navigationBarTitle("Rezepte")
                    .sheet(isPresented: self.$showingAddRecipeView) {
                        AddRecipeView(isPresented: self.$showingAddRecipeView)
                            .environmentObject(self.recipeStore)
                    }
                }
            }
        }
    }

    init() {
        UINavigationBar.appearance().tintColor = UIColor.label
    }

}

但无论间距多少,它看起来都是这样的:图片

但是我注意到当我移动 .navigationBarItems 修饰符时它可以工作,但是一旦你点击 navigationLink 应用程序就会崩溃。

SwiftUI有时在放置一些修饰符时会出现奇怪的行为问题。

在您的情况下,如果您将.navigationBarItems移到navigationBarTitle之后,它应该可以解决此问题,并且您将恢复VStack间距。

.navigationBarTitle("Rezepte")
.navigationBarItems(trailing: Button(action: {
    self.showingAddRecipeView = true
}, label: {
    Image(systemName: "square.and.pencil")
        .foregroundColor(.primary)
}).padding())

此外,我观察到这些与导航相关的修饰符最好靠近NavigationView ,而不是在层次结构中的深处。


示例(基于您的视图层次结构):

struct ContentView: View {
    @State var isShowing: Bool = false
    
    var body: some View {
        NavigationView {
            GeometryReader { (geo) in
                ScrollView {
                    VStack(spacing: 60) {
                        ForEach(0...10, id:\.self) { (index) in
                            NavigationLink(destination: Text(String(index))) {
                                Text("Button")
                            }
                        }
                    }
                    .navigationBarTitle("Title")
                    .navigationBarItems(trailing: Button(action: {
                        self.isShowing = true
                    }, label: {
                        Image(systemName: "square.and.pencil")
                    }))
                    .sheet(isPresented: self.$isShowing) {
                        Button(action: {
                            self.isShowing = false
                        }) {
                            Text("Dismiss")
                        }
                    }
                }
            }
        }
    }
}

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