有没有一种方法可以向NavigationLink添加额外的功能?SwiftUI [英] Is there a way to add an extra function to NavigationLink? SwiftUI

问题描述

我想向NavigationLink添加一个额外的功能.

I would like to add an extra function to the NavigationLink.

示例代码如下:

struct ContentView: View {

func yes () {
print("yes")
}

var body: some View {

NavigationView {
NavigationLink(destination: level1()) {

     Text("Next")      
}}}}

我知道这行不通，但是有可能这样做吗?(它将转到目的地并同时调用该函数)

I know this doesn't work, but is it possible to do something like this? (It will go to the destination and call the function at the same time)

NavigationLink(destination: level1(), yes()) {Text("Next")}   

我尝试在NavigationLink内放置一个按钮，但是它也不起作用.当我这样做时，仅按钮中的功能有效，NavigationLink不起作用.

I tried putting a button inside the NavigationLink but it didn't work either. When I do this only the function in the button works, NavigationLink doesn't.

NavigationLink(destination: level1())   {
        Button(action: { self.yes() }) 
        { Text("Button")}
        }

推荐答案

使用onAppear(perform :) .这将在 View 的外观上执行某些功能.

Use the onAppear(perform:). This will perform some function on a View's appear.

struct ContentView: View {
    var body: some View {
        NavigationView {
            NavigationLink(destination: DetailView().onAppear {
                self.someFunc()
            }) {
                Text("First Screen")
            }
        }
    }

    func someFunc() {
        print("Click")
    }
}

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

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