导航到上一个控制器 SwiftUI答案

【问题标题】：Navigate to previous controller SwiftUI导航到上一个控制器 SwiftUI
【发布时间】：2021-07-01 00:06:24
【问题描述】：

我目前处于特定瓶子详细视图的视图控制器中，并为用户提供了一个操作表，使他们能够删除产品。由于他们可以删除此产品，因此一旦成功删除，我需要导航到以前的控制器。我怎样才能在 Swift 中做到这一点？这将在 API 请求成功时完成。

struct WishlistView: View {
    @State private var showingSheet = false
    @State private var show_modal: Bool = false
    let wishlist: Wishlist

    var body: some View {
        Text("Hello, Marketplace!")
            .navigationBarTitle(wishlist.name)
            .navigationBarItems(trailing:
                HStack {
                    Button(action: {
                        showingSheet = true
                    }) {
                        Image(systemName: "ellipsis.circle.fill")
                    }
                    .actionSheet(isPresented: $showingSheet) {
                        ActionSheet(title: Text("Change background"), message: Text("Select a new color"), buttons: [
                                        .default(Text("Delete Wishlist"), action: {
                                            destroyWishlist()
                                        }),
                            .default(Text("Green")),
                            .default(Text("Blue")),
                            .cancel()
                        ])
                    }
                    .foregroundColor(Color("Rye"))
                }
            )
            .listStyle(InsetGroupedListStyle())
    }
    
    func destroyWishlist() {
        AF.request("http://localhost:3000/wishlist/\(wishlist.id)", method: .delete).responseJSON { response in
        switch response.result {
            case .success:
                print("successful")
        case let .failure(_):
                print("error")
            }
        }
    }
}

【问题讨论】：

您在\.presentationMode 上寻找dismiss() 吗？ stackoverflow.com/questions/56513568/…

标签： ios swift swiftui

【解决方案1】：

您要转到上一个导航视图吗？如果是这样，请尝试以下操作：

1.首先，添加一个环境变量。

@Environment(\.presentationMode) var presentationMode

2。将以下代码放在您想要关闭的位置。

self.presentationMode.wrappedValue.dismiss()

示例：

struct WishlistView: View {
    @Environment(\.presentationMode) var presentationMode
    @State private var showingSheet = false
    @State private var show_modal: Bool = false
    let wishlist: Wishlist

    var body: some View {
        Text("Hello, Marketplace!")
            .navigationBarTitle(wishlist.name)
            .navigationBarItems(trailing:
                HStack {
                    Button(action: {
                        showingSheet = true
                    }) {
                        Image(systemName: "ellipsis.circle.fill")
                    }
                    .actionSheet(isPresented: $showingSheet) {
                        ActionSheet(title: Text("Change background"), message: Text("Select a new color"), buttons: [
                                        .default(Text("Delete Wishlist"), action: {
                                            destroyWishlist()
                                        }),
                            .default(Text("Green")),
                            .default(Text("Blue")),
                            .cancel()
                        ])
                    }
                    .foregroundColor(Color("Rye"))
                }
            )
            .listStyle(InsetGroupedListStyle())
    }
    
    func destroyWishlist() {
        AF.request("http://localhost:3000/wishlist/\(wishlist.id)", method: .delete).responseJSON { response in
        switch response.result {
            case .success:
                print("successful")
                self.presentationMode.wrappedValue.dismiss()
        case let .failure(_):
                print("error")
            }
        }
    }
}

【讨论】：