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Coverage for "ImageMaskedView.swift" : 0.00%

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ChatLayout/Classes/Extras/ImageMaskedView.swift

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//
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// ChatLayout
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// ImageMaskedView.swift
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// https://github.com/ekazaev/ChatLayout
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//
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// Created by Eugene Kazaev in 2020-2023.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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/// A transformation to apply to the `ImageMaskedView.maskingImage`
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public enum ImageMaskedViewTransformation {
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    /// Keep image as it is.
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    case asIs
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    /// Flip image vertically.
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    case flippedVertically
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}
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/// A container view that masks its contained view with an image provided.
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public final class ImageMaskedView<CustomView: UIView>: UIView {
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    /// Contained view.
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    public lazy var customView = CustomView(frame: bounds)
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    /// An Image to be used as a mask for the `customView`.
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    public var maskingImage: UIImage? {
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        didSet {
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            setupMask()
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        }
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    }
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    /// A transformation to apply to the `maskingImage`.
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    public var maskTransformation: ImageMaskedViewTransformation = .asIs {
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        didSet {
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            guard oldValue != maskTransformation else {
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                return
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            }
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            updateMask()
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        }
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    }
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    private lazy var imageView = UIImageView(frame: bounds)
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    /// Initializes and returns a newly allocated view object with the specified frame rectangle.
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    /// - Parameter frame: The frame rectangle for the view, measured in points. The origin of the frame is relative
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    ///   to the superview in which you plan to add it.
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    public override init(frame: CGRect) {
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        super.init(frame: frame)
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        setupSubviews()
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    }
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    /// Returns an object initialized from data in a given unarchiver.
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    /// - Parameter coder: An unarchiver object.
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    public required init?(coder: NSCoder) {
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        super.init(coder: coder)
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        setupSubviews()
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    }
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    private func setupSubviews() {
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        layoutMargins = .zero
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        translatesAutoresizingMaskIntoConstraints = false
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        insetsLayoutMarginsFromSafeArea = false
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!
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        addSubview(customView)
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        customView.translatesAutoresizingMaskIntoConstraints = false
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        NSLayoutConstraint.activate([
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            customView.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
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            customView.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor),
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            customView.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
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            customView.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor)
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        ])
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    }
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    private func setupMask() {
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        guard let bubbleImage = maskingImage else {
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            imageView.image = nil
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            mask = nil
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            return
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        }
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!
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        imageView.image = bubbleImage
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        mask = imageView
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        updateMask()
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    }
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    private func updateMask() {
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        UIView.performWithoutAnimation {
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            let multiplier = effectiveUserInterfaceLayoutDirection == .leftToRight ? 1 : -1
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            switch maskTransformation {
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            case .flippedVertically:
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                imageView.transform = CGAffineTransform(scaleX: CGFloat(multiplier * -1), y: 1)
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            case .asIs:
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                imageView.transform = CGAffineTransform(scaleX: CGFloat(multiplier * 1), y: 1)
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            }
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        }
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    }
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    /// The frame rectangle, which describes the view’s location and size in its superview’s coordinate system.
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    public override final var frame: CGRect {
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        didSet {
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            imageView.frame = bounds
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        }
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    }
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    /// The bounds rectangle, which describes the view’s location and size in its own coordinate system.
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    public override final var bounds: CGRect {
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        didSet {
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            imageView.frame = bounds
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        }
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    }
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}