metatext/Views/EmojiView.swift

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// Copyright © 2021 Metabolist. All rights reserved.
import Kingfisher
import UIKit
final class EmojiView: UIView {
private let imageView = UIImageView()
private let emojiLabel = UILabel()
private var emojiConfiguration: EmojiContentConfiguration
init(configuration: EmojiContentConfiguration) {
emojiConfiguration = configuration
super.init(frame: .zero)
initialSetup()
applyEmojiConfiguration()
}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension EmojiView: UIContentView {
var configuration: UIContentConfiguration {
get { emojiConfiguration }
set {
guard let emojiConfiguration = newValue as? EmojiContentConfiguration else { return }
self.emojiConfiguration = emojiConfiguration
applyEmojiConfiguration()
}
}
}
private extension EmojiView {
func initialSetup() {
layoutMargins = .init(
top: .compactSpacing,
left: .compactSpacing,
bottom: .compactSpacing,
right: .compactSpacing)
addSubview(imageView)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.contentMode = .scaleAspectFit
addSubview(emojiLabel)
emojiLabel.translatesAutoresizingMaskIntoConstraints = false
emojiLabel.textAlignment = .center
emojiLabel.adjustsFontSizeToFitWidth = true
emojiLabel.font = .preferredFont(forTextStyle: .largeTitle)
NSLayoutConstraint.activate([
imageView.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
imageView.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
imageView.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor),
imageView.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor),
emojiLabel.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
emojiLabel.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
emojiLabel.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor),
emojiLabel.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor)
])
}
func applyEmojiConfiguration() {
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imageView.isHidden = emojiConfiguration.emoji.system
if case let .custom(emoji, _) = emojiConfiguration.emoji {
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imageView.isHidden = false
emojiLabel.isHidden = true
imageView.kf.setImage(with: emoji.url)
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} else {
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imageView.isHidden = true
emojiLabel.isHidden = false
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emojiLabel.text = emojiConfiguration.emoji.name
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}
}
}