25.7 Using an Environment Object

The final step in this tutorial is to convert the observable object to an environment object. This will allow both views to access the same TimerData object without the need for a reference to be passed from one view to the other.

This change does not require any modifications to the TimerData.swift class declaration and only minor changes are needed within the two SwiftUI view files. Starting with the ContentView.swift file, modify the navigation link destination so that timerData is no longer passed through to SecondView. Also add a call to the environmentObject() modifier to insert the timerData instance into the view hierarchy environment:

import SwiftUI

 

struct ContentView: View {

    

@StateObject var timerData: TimerData = TimerData()

        

    var body: some View {

        

 ...