SwiftUI NavigationLink:如何在显示目标视图之前调用函数 [英] SwiftUI NavigationLink: how to call a function before showing destination view

问题描述

我想调用一个函数，之后点击一个项目，之前显示目标视图.

I would like to call a function, after clicking on an item, and before displaying the destination view.

以下代码似乎不起作用:调用了 myFunction，但未显示目标视图.

The code below doesn't seem to work: myFunction is called, but the destination view is not shown.

看起来 onTapGesture 覆盖了 NavigationLink 目标.

It looks like the onTapGesture overwrites the NavigationLink destination.

NavigationView {
    List(restaurants) { restaurant in
        NavigationLink(destination: RestaurantView(restaurant: restaurant)) {
            RestaurantRow(restaurant: restaurant)
        }.onTapGesture { myModel.myFunction(restaurant) }
    }
}

如何在单击列表项时同时拥有两者?

How can I have both, when clicking on a list item?

• 函数被调用
• 显示目的地视图

推荐答案

尝试将 NavigationLink 添加到 Button 中，例如:

Try to add NavigationLink into a Button, like:

Button(action: {
    //Call here
    myModel.myFunction(restaurant)
}, label: {
    NavigationLink(destination: RestaurantView(restaurant: restaurant)) {
            RestaurantRow(restaurant: restaurant)
    }
})

EDIT粘贴测试代码，直接试试

EDIT pasted test code, try directly

 struct TestNavigationView: View {

    var body: some View {
        NavigationView {
            VStack {
                NavigationLink(destination: Text("Detail").onAppear() {
                    test()
                }) {
                    Text("Click")
                }
            }
        }

    }

    func test() {
        print("Hell0")
    }
}

另一种方法:(如果 List 在那里可能不起作用)

another approach: (might not work if List there)

struct TestNavigationView: View {

    var body: some View {
        NavigationView {
            VStack {

                NavigationLink(destination: Text("Detail")) {
                    Text("Click")
                }.simultaneousGesture(TapGesture().onEnded{
                    test()
                })

            }
        }

    }

    func test() {
        print("Hell0")
    }
}

这篇关于SwiftUI NavigationLink:如何在显示目标视图之前调用函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！