Output print statements

Question

Connor_Singleton OP

Created Aug ’23

Replies 2

Boosts 0

Participants 2

Hi all,

I am unsure as to why my print statements aren't being shown in the output section when I run a simulation ?

Please could you have a look at my code and explain ?

import SwiftUI

struct ContentView: View { @State var dateIdentifier : String = "" @State var lastSelectedIdentifier : String = "" var body: some View { NavigationView { VStack { Button(action: { dateIdentifier.append("a"); lastSelectedIdentifier.append("a"); print(dateIdentifier);

            }) {
                NavigationLink(destination: Text("OutPut")) {
                    Rectangle()
                        .frame(width: 100, height: 100)
                        
                }
            }

            Button(action: {
                dateIdentifier.append("b");
                lastSelectedIdentifier.append("b");
                print(dateIdentifier);
            }) {
                NavigationLink(destination: Text("OutPut")) {
                    Rectangle()
                        .frame(width: 100, height: 100)
                }
            }

            Button(action: {
                dateIdentifier.append("c");
                lastSelectedIdentifier.append("c");
                print(dateIdentifier);
            }) {
                NavigationLink(destination: Text("OutPut")) {
                    Rectangle()
                        .frame(width: 100, height: 100)
                }
            }
        }
    }
}

}

Thank you

Connor

Boost

Answer 1

newwbee OP

Aug ’23

Problem

NavigationLink and Button both perform actions.
So having both NavigationLink and Button doesn't make sense, so the action of the button is ignored.

Points to note

NavigationLink is used for navigation
NavigationView is deprecated, so use NavigationStack instead

Solution

Given below is sample code using NavigationStack, use onChange(of:) to detect any changes to path.

Tip

You could even pass the path variable as a binding to the destination views

struct ContentView: View {
    @State private var path = [Int]()
    
    var body: some View {
        NavigationStack(path: $path) {
            VStack {
                NavigationLink(value: 1) {
                    Rectangle()
                        .frame(width: 100, height: 100)
                }
                
                NavigationLink(value: 2) {
                    Rectangle()
                        .frame(width: 100, height: 100)
                }
                
                NavigationLink(value: 3) {
                    Rectangle()
                        .frame(width: 100, height: 100)
                }
            }
            .navigationDestination(for: Int.self) { value in
                Text("Selected box: \(value)")
            }
        }
        .onChange(of: path) { newPath in
            print("path: \(newPath)")
        }
    }
}

1

Answer 2

Connor_Singleton OP

Aug ’23

Thank you !

0