Toggling Values on EnvironmentValue (EditMode)

Question

Tomato OP

Created Sep ’21

Replies 3

Boosts 0

Participants 3

I have the following lines of code for showing a list of friends.

import SwiftUI

struct ContentView: View {
	@State var users = ["Susan", "Kate", "Natalie", "Kimberly", "Taylor", "Sarah", "Nancy", "Katherine", "Nicole", "Linda", "Jane", "Mary", "Olivia", "Barbara"]
	@State var editMode = EditMode.inactive
	
	var body: some View {
		NavigationView {
			List {
				ForEach(users, id: \.self) { user in
					Text(user)
				}
			}
			.navigationBarTitle("Friends")
			.environment(\.editMode, $editMode)
			.navigationBarItems(leading: Button("Edit", action: {
				if self.editMode == .active {
					self.editMode = .inactive
				} else {
					self.editMode = .active
				}
			}))
		}
	}
}

If you see the code at the bottom, I have four lines just in order to change the value of editMode. Does SwiftUI have something like

showDetails.toggle()

where showDetails is a Boolean variable? Muchos thankos.

Answered by OOPer in 687387022

You can use toggle() on Bool, because Bool has a method named toggle():

toggle()

As far as I checked, EditMode does not have a method named toggle() nor any other method of similar functionalities.

EditMode

If you do want it, you can define your own extension for EditMode:

struct ContentView: View {
    @State var users = ["Susan", "Kate", "Natalie", "Kimberly", "Taylor", "Sarah", "Nancy", "Katherine", "Nicole", "Linda", "Jane", "Mary", "Olivia", "Barbara"]
    @State var editMode: EditMode = .inactive
    
    var body: some View {
        NavigationView {
            List {
                ForEach(users, id: \.self) { user in
                    Text(user)
                }
            }
            .navigationBarTitle("Friends")
            .environment(\.editMode, $editMode)
            .navigationBarItems(leading: Button("Edit", action: {
                self.editMode.toggle()
            }))
        }
    }
}

extension EditMode {
    mutating func toggle() {
        if self.isEditing {
            self = .inactive
        } else {
            self = .active
        }
    }
}

Boost

Answer 1

Tomato OP

Sep ’21

Probably not because this EnvironmetValue is not dichotomous?

0

Answer 2

OOPer OP

Sep ’21

Accepted Answer

You can use toggle() on Bool, because Bool has a method named toggle():

toggle()

As far as I checked, EditMode does not have a method named toggle() nor any other method of similar functionalities.

EditMode

If you do want it, you can define your own extension for EditMode:

struct ContentView: View {
    @State var users = ["Susan", "Kate", "Natalie", "Kimberly", "Taylor", "Sarah", "Nancy", "Katherine", "Nicole", "Linda", "Jane", "Mary", "Olivia", "Barbara"]
    @State var editMode: EditMode = .inactive
    
    var body: some View {
        NavigationView {
            List {
                ForEach(users, id: \.self) { user in
                    Text(user)
                }
            }
            .navigationBarTitle("Friends")
            .environment(\.editMode, $editMode)
            .navigationBarItems(leading: Button("Edit", action: {
                self.editMode.toggle()
            }))
        }
    }
}

extension EditMode {
    mutating func toggle() {
        if self.isEditing {
            self = .inactive
        } else {
            self = .active
        }
    }
}

0

Answer 3

workingdogintokyo OP

Sep ’21

you could use this one-liner:

editMode = editMode == .active ? .inactive : .active

0