Hey everyone! In this post, I want to talk about how we can add and manage different gestures in UIKit. This post will be updated as I explore more gesture interactions. When needed, I’ll also touch on accessibility considerations, especially for VoiceOver.

Long Press Gesture

UIKit handles long press gestures using a class called UILongPressGestureRecognizer. You can attach it to any UIView using the addGestureRecognizer() method.

With UILongPressGestureRecognizer, you can configure:

The action that will be executed (this method must be marked with @objc),
The required duration before the gesture triggers,
And other options, which you can explore through the class’s available properties and methods.

Gesture States

The UILongPressGestureRecognizer can be in one of several states:

.possible: The default state before the gesture has been recognized.
.began: The gesture has met the minimum duration and has started.
.changed: The user’s finger has moved while still pressing.
.ended: The user has lifted their finger, ending the gesture.
.cancelled: The system canceled the gesture (e.g., an interruption).
.failed: The gesture didn’t meet the criteria for recognition.

Example

Here is a simple example of a label with an attached long press gesture recognizer:

import UIKit

class ViewController: UIViewController {
    
    private lazy var label: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = "Hello, World!"
        label.textAlignment = .center
        label.font = .systemFont(ofSize: 24, weight: .medium)
        label.isUserInteractionEnabled = true // Required to detect gestures on the label
        return label
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
        setupLongPressGesture(for: label)
    }
}

private extension ViewController {
    func setupUI() {
        view.backgroundColor = .systemBackground
        
        view.addSubview(label)
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: view.centerYAnchor),
        ])
    }
    
    func setupLongPressGesture(for view: UIView) {
        let recognizer = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress))
        recognizer.minimumPressDuration = 0.5 // Customize duration if needed
        view.addGestureRecognizer(recognizer)
    }
    
    @objc func handleLongPress(_ gesture: UILongPressGestureRecognizer) {
        switch gesture.state {
        case .began:
            label.text = "Long press!"
        case .ended:
            label.text = "Hello, World!"
        default:
            break
        }
    }
}

Long press demo

This is a great starting point for adding more complex gestures or chaining interactions. In future updates, I’ll cover tap gestures, swipes, and how to handle VoiceOver interactions effectively.

Thanks for reading!

Handling Touch Gestures in UIKit

Hey everyone! In this post, I want to talk about how we can add and manage different gestures in UIKit. This post will be updated as I explore more gesture interactions. When needed, I'll also touch...

Long Press Gesture

Gesture States

Example