CIBumpDistortion filter not working on my view

I'm trying to apply a CIBumpDistortion Core Image filter to a view that contains a UILabel (my storyLabel). The goal is to create a visual bump/magnifying glass effect over the text.

However, despite my attempts, the filter doesn't seem to render at all. The view and the label appear as normal, with no distortion effect. I've tried adjusting the filter parameters and reviewing the view hierarchy, but without success. I also haven't been able to find clear documentation or examples for applying this filter to a UIView's layer.

// // TVView.swift // Mistery // // Created by Joje on 31/07/25. //

import CoreImage import CoreImage.CIFilterBuiltins import UIKit import AVFoundation

final class TVView: UIView {

// propriedades animacao texto
private var textAnimationTimer: Timer?
private var fullTextToAnimate: String = ""
private var currentCharIndex: Int = 0

// propriedades video estatica
private var player: AVQueuePlayer?
private var playerLayer: AVPlayerLayer?
private var playerLooper: AVPlayerLooper?

var onNextButtonTap: () -> Void = {}

// MARK: - Subviews

// imagem da TV
private(set) lazy var tvImageView: UIImageView = {
    
    let imageView = UIImageView()
    imageView.translatesAutoresizingMaskIntoConstraints = false
    
    imageView.image = UIImage(named: "tvFinal")
    imageView.contentMode = .scaleAspectFit
    
    return imageView
}()

// texto que passa dentro da TV
private(set) lazy var storyLabel: UILabel = {
    
    let label = UILabel()
    label.translatesAutoresizingMaskIntoConstraints = false
    
    //label.backgroundColor = .gray
    label.textColor = .red
    label.font = UIFont(name: "MeltedMonster", size: 30)
    label.textAlignment = .left
    label.numberOfLines = 0
    label.text = ""
            
    
    return label
    
}()

private(set) lazy var nextButton: UIButton = {
    
    let button = UIButton(type: .system)
    button.translatesAutoresizingMaskIntoConstraints = false
    
    //button.backgroundColor = .darkGray
    
    button.addTarget(self, action: #selector(didPressNextButton), for: .touchUpInside)
    
    return button
    
}()

// MARK: - Lifecycle
override init(frame: CGRect) {
    super.init(frame: frame)
    
    backgroundColor = .black
            
    setupVideoPlayer()
    
    addSubviews()
    setupConstraints()
}

override func layoutSubviews() {
    super.layoutSubviews()
    
    playerLayer?.frame = tvImageView.frame.insetBy(dx: tvImageView.frame.width * 0.05, dy: tvImageView.frame.height * 0.18)
    
    setupFisheyeEffect()
}

private func setupFisheyeEffect() {
    
    // cria o filtro
    guard let filter = CIFilter(name: "CIBumpDistortion") else {return print("erro")}
    
    storyLabel.layer.shouldRasterize = true
    storyLabel.layer.rasterizationScale = UIScreen.main.scale
    
    // define os parametros
    filter.setDefaults()
    
    // centro do efeito
    let center = CIVector(x: storyLabel.bounds.midX, y: storyLabel.bounds.midY)
    filter.setValue(center, forKey: kCIInputCenterKey)
    
    // raio de distorção
    filter.setValue(storyLabel.bounds.width, forKey: kCIInputRadiusKey)
    
    // intensidade de distorção
    filter.setValue(7, forKey: kCIInputScaleKey)
    
    storyLabel.layer.filters = [filter]
    
}

required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}



// MARK: - Button actions

@objc private func didPressNextButton() {
    onNextButtonTap()
}

@objc private func animateNextCharacter() {
    
    guard currentCharIndex < fullTextToAnimate.count else {
        textAnimationTimer?.invalidate()
        return
    }
    
    let currentTextIndex = fullTextToAnimate.index(fullTextToAnimate.startIndex, offsetBy: currentCharIndex)
    let partialText = String(fullTextToAnimate[...currentTextIndex])
    
    storyLabel.text = partialText
    
    currentCharIndex += 1
}

public func updateStoryText(with text: String) {
    textAnimationTimer?.invalidate()
    
    storyLabel.text = ""
    fullTextToAnimate = text
    currentCharIndex = 0
    
    textAnimationTimer = Timer.scheduledTimer(timeInterval: 0.12, target: self, selector: #selector(animateNextCharacter), userInfo: nil, repeats: true)
}


// MARK: - Setup methods

private func setupVideoPlayer() {
    
    guard let videoURL = Bundle.main.url(forResource: "static-video", withExtension: "mov") else {
        print("Erro: Não foi possível encontrar o arquivo de vídeo static-video.mov")
        return
    }
    let playerItem = AVPlayerItem(url: videoURL)
    
    player = AVQueuePlayer(playerItem: playerItem)
    // LINHA COM POSSIVEL ERRO
    playerLooper = AVPlayerLooper(player: player!, templateItem: playerItem)
    
    playerLayer = AVPlayerLayer(player: player)
    playerLayer?.videoGravity = .resizeAspectFill

    if let layer = playerLayer {
        self.layer.addSublayer(layer)
    }
    
    player?.play()
}

private func addSubviews() {
    
    self.addSubview(storyLabel)
    self.addSubview(tvImageView)
    self.addSubview(nextButton)
    
}

private func setupConstraints() {
    
    NSLayoutConstraint.activate([
        
        // TV Image
        tvImageView.centerXAnchor.constraint(equalTo: centerXAnchor),
        tvImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
        tvImageView.widthAnchor.constraint(equalTo: widthAnchor),
        
        // TV Text
        storyLabel.centerXAnchor.constraint(equalTo: tvImageView.centerXAnchor, constant: -50),
        storyLabel.centerYAnchor.constraint(equalTo: tvImageView.centerYAnchor, constant: -25),
        storyLabel.widthAnchor.constraint(equalTo: tvImageView.widthAnchor, multiplier: 0.35),
        storyLabel.heightAnchor.constraint(equalTo: tvImageView.heightAnchor, multiplier: 0.42),
        
        //TV Button
        nextButton.topAnchor.constraint(equalTo: tvImageView.centerYAnchor, constant: -25),
        nextButton.centerXAnchor.constraint(equalTo: self.centerXAnchor, constant: 190),
        nextButton.widthAnchor.constraint(equalToConstant: 100),
        nextButton.heightAnchor.constraint(equalToConstant: 160)
        
        
    ])
}

}

#Preview{ ViewController() }