Apple has abandoned navigationview and used navigationstack and navigationsplitview to implement swiftui navigation

Apple Have been abandoned NavigationView, It was previously used to encapsulate the view stack , These views are essentially views pushed during rendering and popped up when closing . This is a iOS Navigation is a familiar way to use from the beginning , There is no physical back button , But there is a navigation bar at the top , There is a back button , It describes “ back off ” The location of .

There are two new ways to implement navigation , But they end up iPhone It looks very similar , The reason I will discuss later .

Let's get started ！

NavigationStack

This application is very simple from several Hashable and Identifiable Structure began to .

Screen The enumeration that stores the navigation state must be Hashable, Because the new initialization program needs NavigationLink it , I'll use it later . In order to be Hashable The relevant value also needs to be Hashable. If they just String and an , This is still true Int, But I want to use ForEachwhich The required type is also Identifiable. As the original value type String also Int It's interchangeable , And they don't define their unique properties .

I have added data ContentView Is two arrays .

I can （ And probably should ） Use anObservableObject To store data , But I'd rather write more code to specifically demonstrate navigation .

import Foundation

struct Word: Hashable, Identifiable {
    let id = UUID()
    let name: String
}

struct Number: Hashable, Identifiable {
    let id = UUID()
    let value: Int
}

enum Screen: Hashable {
    case word(Word)
    case number(Number)