在移动到目的地视图之前如何在 NavigationLink 中执行某些操作(例如:print(“hi"))

问题描述

我正在尝试创建一个按钮，希望在导航到另一个视图之前执行一些操作.但是，如果我使用 Button，则无法导航到另一个视图，而如果我使用 NavigationLink，则只能进行导航.

I am trying to create a button an want to do some stuff before navigating to another view. But if I use a Button, I can't navigate to another view and if I user NavigationLink, I can't do anything except navigating.

我在下面添加按钮和导航链接.

I am adding button and navigation link below.

我正在尝试使用此按钮进行 firebase 身份验证，在完成身份验证后，我想导航到另一个视图.

I am trying to do firebase authentication with this button and after completing authentication I want to navigate to another view.

Button(action: {print("Hi")}) {
                Text("Create Account")
                    .font(.system(size: 20))
                    .foregroundColor(Color("GreyLabel0"))              
    }

NavigationLink(destination: WelcomeView()) {
     Text("Create Account")
                    .font(.system(size: 20))
                    .foregroundColor(Color("GreyLabel0"))
}

推荐答案

在 beta 6 中，DynamicNavigationDestinationLink 已经消失，所以我更新了答案以改用 NavigationLink.

In beta 6, DynamicNavigationDestinationLink is gone, so I am updating the answer to use NavigationLink instead.

请注意，目前 NavigationLink 中存在一个错误，请在此处解决:https://stackoverflow.com/a/57274613/7786555

Note that at the moment there is a bug in NavigationLink, which is addressed here: https://stackoverflow.com/a/57274613/7786555

import SwiftUI

struct ContentView: View {
    @State private var presentMe = false

    var body: some View {
        NavigationView {
            VStack {

                NavigationLink(destination: DetailView(), isActive: $presentMe) { EmptyView() }

                Button(action: {
                    print("hi")
                    self.presentMe = true
                }, label: {
                    Text("Present Now!")
                })

                Spacer()

            }.navigationBarTitle(Text("Top View"))
        }
    }
}

struct DetailView: View {
    var body: some View {
        Text("Detailed View")
    }
}

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