SwiftUI: How to make TextField become first responder?

Here's my SwiftUI code:

struct ContentView : View {

    @State var showingTextField = false
    @State var text = ""

    var body: some View {
        return VStack {
            if showingTextField {
                TextField($text)
            }
            Button(action: { self.showingTextField.toggle() }) {
                Text ("Show")
            }
        }
    }
}

What I want is when the text field becomes visible, to make the text field become the first responder (i.e. receive focus & have the keyboard pop up).

Solution

iOS 15.0+

macOS 12.0+,

Mac Catalyst 15.0+,

tvOS 15.0+,

watchOS 8.0+

Use `focused(_:)` if you have a single TextField.

focused(_:)

Modifies this view by binding its focus state to the given Boolean state value.

struct NameForm: View {
    
    @FocusState private var isFocused: Bool
    
    @State private var name = ""
    
    var body: some View {
        TextField("Name", text: $name)
            .focused($isFocused)
        
        Button("Submit") {
            if name.isEmpty {
                isFocued = true
            }
        }
    }
}

Use `focused(_:equals:)` should you have multiple TextFields.

focused(_:equals:)

Modifies this view by binding its focus state to the given state value.

struct LoginForm: View {
    enum Field: Hashable {
        case usernameField
        case passwordField
    }

    @State private var username = ""
    @State private var password = ""
    @FocusState private var focusedField: Field?

    var body: some View {
        Form {
            TextField("Username", text: $username)
                .focused($focusedField, equals: .usernameField)

            SecureField("Password", text: $password)
                .focused($focusedField, equals: .passwordField)

            Button("Sign In") {
                if username.isEmpty {
                    focusedField = .usernameField
                } else if password.isEmpty {
                    focusedField = .passwordField
                } else {
                    handleLogin(username, password)
                }
            }
        }
    }
}

SwiftUI Documentation

Update

I tested this in Xcode version 13.0 beta 5 (13A5212g). It works