RaajeevChandran

class StreamingLabel: UILabel {
    weak var delegate: StreamingLabelDelegate?
    
    private var streamDelay: TimeInterval = 0.05
    
    private var targetText: String = ""
    private var currentIndex: String.Index?
    private var displayTimer: Timer?
    
    var charactersPerSecond: Float {

RaajeevChandran

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let btn = UIButton(type: .system)
        btn.translatesAutoresizingMaskIntoConstraints = false
        btn.setTitle("Show Sheet", for: .normal)
        btn.addTarget(self, action: #selector(tap), for: .touchUpInside)

RaajeevChandran

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let btn = UIButton(type: .system)
        btn.translatesAutoresizingMaskIntoConstraints = false
        btn.setTitle("Show Sheet", for: .normal)
        btn.addTarget(self, action: #selector(tap), for: .touchUpInside)
        view.addSubview(btn)
        NSLayoutConstraint.activate([

RaajeevChandran

import UIKit

class BottomSheetPresentationController: UIPresentationController {
    
    private let dismissThreshold: CGFloat = 0.3
    
    private let grabberView: UIView = {
        let view = UIView()
        view.frame.size = CGSize(width: 50, height: 3)
        view.backgroundColor = .lightGray

RaajeevChandran

private func didInteractionEnd() {
    guard let presentedView = presentedView else {
        return
    }
    
    if let transitioningDelegate = transitioningDelegate {
        let dismissFraction = transitioningDelegate.transition.dismissFractionComplete
        
        if dismissFraction > dismissThreshold {
            transitioningDelegate.transition.finish()

RaajeevChandran

private func didGestureTranslationChange(_ translation: CGPoint) {
    guard let presentedView = presentedView else {
        return
    }
    
    let translationY = max(0, translation.y)
    presentedView.transform = CGAffineTransform(translationX: 0, y: translationY)
    
    let progress = translationY / presentedView.frame.height
    transitioningDelegate?.transition.update(progress)

RaajeevChandran

@objc private func pannedPresentedView(_ recognizer: UIPanGestureRecognizer) {
    guard let presentedView = presentedView else {
        return
    }
    
    switch recognizer.state {
    case .began:
        transitioningDelegate?.transition.wantsInteractiveStart = true
    
    case .changed:

RaajeevChandran

private func dismiss(withInteraction: Bool) {
    transitioningDelegate?.transition.wantsInteractiveStart = withInteraction
    presentedViewController.dismiss(animated: true)
}

RaajeevChandran

extension BottomSheetPresentationController {
    private func setupInteraction() {
        guard let presentedView = presentedView else {
            return
        }
        
        func addGestureIfNeeded(_ gesture: UIGestureRecognizer, to view: UIView, delegate: UIGestureRecognizerDelegate? = nil) {
            if let recognizers = view.gestureRecognizers, recognizers.contains(gesture) {
                return
            }

RaajeevChandran

override func dismissalTransitionWillBegin() {
    super.dismissalTransitionWillBegin()
    
    presentedViewController.transitionCoordinator?.animate(alongsideTransition: { [weak self] _ in
        guard let self else { return }
        
        self.presentedView?.layer.cornerRadius = .zero
        self.dimmedBackgroundView.backgroundColor = .clear
    })
}