TitleAndTextView.swift

// `.` indicates code left out. 
// Please refer to the sample app for reference
// https://github.com/josh-marasigan/ObserverDesignExample

// Somewhere in the TitleAndTextView.swift file
class TitleAndTextView: UIView {
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// MARK: - Class Properties. Fun fact: emojis are just stirng literals
private let titleLabel = UILabel()
private let emoji = UILabel()
private var subTitleLabel = UILabel()
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init() {
  super.init(frame: .zero)
  self.configObservers()
  .
}
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// Initialize Observers
private func configObservers() {
  let tealNotificationName = Notification.Name(rawValue: ObserverKeys.teal)
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(changeSubTitleToTeal(notification:)),
            name: tealNotificationName,
            object: nil
        )

        NotificationCenter.default.addObserver(
            self,
            selector: #selector(changeEmojiAccordingToTeal(notification:)),
            name: tealNotificationName,
            object: nil
        )

        let pinkNotificationName = Notification.Name(rawValue: ObserverKeys.pink)
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(changeSubTitleToPink(notification:)),
            name: pinkNotificationName,
            object: nil
        )

        NotificationCenter.default.addObserver(
            self,
            selector: #selector(changeEmojiAccordingToPink(notification:)),
            name: pinkNotificationName,
            object: nil
        )
}
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// MARK: - Actions
@objc func changeSubTitleToTeal(notification: Notification) {
  self.subTitleLabel.text = "Teal"
}

@objc func changeEmojiAccordingToTeal(notification: Notification) {
  self.emoji.text = "🗽"
}

@objc func changeSubTitleToPink(notification: Notification) {
  self.subTitleLabel.text = "Pink" 
}

@objc func changeEmojiAccordingToPink(notification: Notification) {
  self.emoji.text = "💕"
}