How to detect if keyboard is present in swiftui

Question

I want to know if the keyboard is present when the button is pressed. How would I do this? I have tried but I don't have any luck. Thanks.

Answer 1

Using this protocol, KeyboardReadable, you can conform to any View and get keyboard updates from it.

KeyboardReadable protocol:

import Combine
import UIKit


/// Publisher to read keyboard changes.
protocol KeyboardReadable {
    var keyboardPublisher: AnyPublisher<Bool, Never> { get }
}

extension KeyboardReadable {
    var keyboardPublisher: AnyPublisher<Bool, Never> {
        Publishers.Merge(
            NotificationCenter.default
                .publisher(for: UIResponder.keyboardWillShowNotification)
                .map { _ in true },
            
            NotificationCenter.default
                .publisher(for: UIResponder.keyboardWillHideNotification)
                .map { _ in false }
        )
        .eraseToAnyPublisher()
    }
}

It works by using Combine and creating a publisher so we can receive the keyboard notifications.

With an example view of how it can be applied:

struct ContentView: View, KeyboardReadable {
    
    @State private var text: String = ""
    @State private var isKeyboardVisible = false
    
    var body: some View {
        TextField("Text", text: $text)
            .onReceive(keyboardPublisher) { newIsKeyboardVisible in
                print("Is keyboard visible? ", newIsKeyboardVisible)
                isKeyboardVisible = newIsKeyboardVisible
            }
    }
}

You can now read from the isKeyboardVisible variable to know if the keyboard is visible.

When the TextField is active with the keyboard showing, the following prints:

Is keyboard visible? true

When the keyboard is then hidden upon hitting return, the following prints instead:

Is keyboard visible? false

You can use keyboardWillShowNotification/keyboardWillHideNotification to update as soon as they keyboard starts to appear or disappear, and the keyboardDidShowNotification/keyboardDidHideNotification variants to update after the keyboard has appeared or disappeared. I prefer the will variant because the updates are instant for when the keyboard shows.