barisuyar

final class MockURLProtocol: URLProtocol {
    
    override class func canInit(with request: URLRequest) -> Bool { true }
}

barisuyar

struct CameraPermission: Permission {
    
    var status: AVAuthorizationStatus {
        AVCaptureDevice.authorizationStatus(for: .video)
    }
    
    func request(completion: @escaping (AVAuthorizationStatus) -> ()) {
        AVCaptureDevice.requestAccess(for: .video) { (granted) in
            completion(self.status)
        }

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struct MicrophonePermission: Permission {
    
    var status: AVAudioSession.RecordPermission {
        AVAudioSession.sharedInstance().recordPermission
    }
    
    func request(completion: @escaping (AVAudioSession.RecordPermission) -> ()) {
        AVAudioSession.sharedInstance().requestRecordPermission { _ in
            completion(self.status)
        }

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protocol Permission {
    associatedtype PermissionType
    var status: PermissionType { get }
    
    func request(completion: @escaping (PermissionType) -> ())
}

barisuyar

import UIKit

final class Slider: UISlider {

    private let baseLayer = CALayer() // Step 3
    private let trackLayer = CAGradientLayer() // Step 7

    override func draw(_ rect: CGRect) {
        super.draw(rect)
        setup()

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@objc private func valueChanged(_ sender: Slider) {
        // Step 9
        CATransaction.begin()
        CATransaction.setDisableActions(true)
        let thumbRectA = thumbRect(forBounds: bounds, 
                                   trackRect: trackRect(forBounds: bounds), 
                                   value: value)
        trackLayer.frame = .init(x: 0, 
                                 y: frame.height / 4, 
                                 width: thumbRectA.midX, 

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private func setup() {
    clear()
    createBaseLayer() // Step 3
    createThumbImageView() // Step 5
    configureTrackLayer() // Step 7
    addTarget(self, action: #selector(valueChanged(_:)), for: .valueChanged) // Step 8
}

// Step 8
@objc private func valueChanged(_ sender: Slider) {

barisuyar

private let trackLayer = CAGradientLayer() // Step 7

// Step 7
private func configureTrackLayer() {
    let firstColor = UIColor(red: 210/255, green: 152/255, blue: 238/255, alpha: 1).cgColor
    let secondColor = UIColor(red: 166/255, green: 20/255, blue: 217/255, alpha: 1).cgColor
    trackLayer.colors = [firstColor, secondColor]
    trackLayer.startPoint = .init(x: 0, y: 0.5)
    trackLayer.endPoint = .init(x: 1, y: 0.5)
    trackLayer.frame = .init(x: 0, 

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// Step 5
private func createThumbImageView() {
    let thumbSize = (3 * frame.height) / 4
    let thumbView = ThumbView(frame: .init(x: 0, 
                                           y: 0, 
                                           width: thumbSize, 
                                           height: thumbSize))
    thumbView.layer.cornerRadius = thumbSize / 2
    let thumbSnapshot = thumbView.snapshot
    setThumbImage(thumbSnapshot, for: .normal)

barisuyar

// Step 5
private func createThumbImageView() {
    let thumbSize = (3 * frame.height) / 4
    let thumbView = ThumbView(frame: .init(x: 0, 
                                           y: 0, 
                                           width: thumbSize, 
                                           height: thumbSize))
    thumbView.layer.cornerRadius = thumbSize / 2
    let thumbSnapshot = thumbView.snapshot
    setThumbImage(thumbSnapshot, for: .normal)