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Overview

The CometChatReactionsList component is designed to manage and display reactions associated with messages. It offers a user-friendly interface for users to express their reactions to messages and provides options to remove reactions when necessary. The component intelligently organizes reactions by emoji, giving a clear overview of the variety of reactions for a message along with details of who reacted with each emoji. The component consists of two distinct lists: one at the top with horizontal scrolling to display unique reactions and their counts, allowing users to select reactions for further details. The middle list shows selected reactions and the users who reacted to them. Additionally, the interface seamlessly integrates functionality to remove reactions added by the logged-in user.

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Usage

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Integration

CometChatReactionList is a UIViewController that contains a list of reactions. It is commonly used within the CometChatMessageList, but it can be integrated into any UIViewController. The component requires a list of reactions (provided via the baseMessage) to function properly. 
let reactionList = CometChatReactionList()
    .set(message: message)

//presenting in half sheet format
if let presentationController = reactionList.presentationController as? UISheetPresentationController {
    presentationController.detents = [.medium()]
    presentationController.prefersGrabberVisible = true
    self.present(reactionList, animated: true)
}
If you are already using a navigation controller, you can use the pushViewController function instead of presenting the view controller.

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Actions

Actions dictate how a component functions. They are divided into two types: Predefined and User-defined. You can override either type, allowing you to tailor the behavior of the component to fit your specific needs.
1. OnClick
The onClick event is triggered when a user interacts with a reaction by pressing it, typically to indicate a response or provide feedback. 
let reactionList = CometChatReactionList()
.set { messageReaction, messageObject in
            //Perform your actions
}
2. OnTappedToRemoveClicked
The onTappedToRemoveClicked callback is triggered when a list item is tapped to remove. 
let reactionListConfiguration = ReactionListConfiguration()
.set (onTappedToRemoveClicked:{ messageReaction, messageObject in
        //Perform Your Action
})

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Filters

Filters enable customization of the displayed data in a component’s list by applying specific criteria. Using the ReactionsRequestBuilder in the Reaction List Component, you can customize your reaction list based on various options to suit your requirements. For more information about ReactionsRequestBuilder, refer to the documentation on ReactionsRequestBuilder. In the example below, we illustrate how to apply a filter to the reactions list, allowing you to specify a limit on the number of users who have reacted to a particular message.
Swift
let reactionsRequestBuilder = ReactionsRequestBuilder()
    .set(limit: 2)

let reactionListConfiguration = ReactionListConfiguration()
    .set(reactionRequestBuilder: reactionsRequestBuilder)

let messageListConfiguration = MessageListConfiguration()
    .set(reactionListConfiguration: reactionListConfiguration)

let messagesConfiguration = MessagesConfiguration()
    .set(messageListConfiguration: messageListConfiguration)

let cometChatConversationsWithMessages = CometChatConversationsWithMessages()
    .set(messagesConfiguration: messagesConfiguration)
Ensure to pass and present CometChatConversationsWithMessages. If a navigation controller is already in use, utilize the pushViewController function instead of directly presenting the view controller.

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Events

Events are triggered by a component, enabling you to enhance its functionality. These events are global in scope, making them applicable across multiple areas of your application, and they can be added or removed as required. The Reactions List component does not provide any available events.

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Customization

For customization aligned with your app’s design, you can adjust the appearance of the Reaction List component using our accessible methods. These methods enable you to tailor the experience and behavior to suit your specific needs.

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Style

Through Style, you can customize the visual presentation of the component in your app. This includes controlling elements such as color, size, shape, and fonts to achieve the desired look and feel.
1. Reactions List Style
The ReactionsListStyle class encapsulates properties that facilitate customization of the CometChatReactionsList component’s visual appearance. 
let reactionListStyle = ReactionListStyle()
    .set(background: .systemGray2)
    .set(loadingTint: .darkGray)
    .set(errorTextColor: .black)
    .set(activeEmojiBackgroundColor: .white)
    .set(activeEmojiCornerRadius: CometChatCornerStyle(cornerRadius: 5))

 let reactionListConfiguration = ReactionListConfiguration()
    .set(style: reactionListStyle)

let messageListConfiguration = MessageListConfiguration()
    .set(reactionListConfiguration: reactionListConfiguration)

let messagesConfiguration = MessagesConfiguration()
    .set(messageListConfiguration: messageListConfiguration)

let cometChatConversationsWithMessages = CometChatConversationsWithMessages()
    .set(messagesConfiguration: messagesConfiguration)
Example Here, we are applying the ReactionsListStyle to customize the appearance using setStyle method.
The following properties are exposed by ReactionListStyle:
PropertyDescriptionCode
Background ColorSets the background color.set(background: UIColor)
Corner RadiusSets the corner radius.set(cornerRadius: CometChatCornerStyle)
Border WidthSets the width of the border.set(borderWidth: CGFloat)
Border ColorSets the color of the border.set(borderColor: UIColor)
Subtitle ColorSets the subtitle color that has “Tap to remove” text.set(subtitleColor: UIColor)
Subtitle FontSets the font for subtitle that has “Tap to remove” text.set(subtitleFont: UIFont)
TailView FontSets the font for tailView that has reaction.set(tailViewFont: UIFont)
Active Emoji Background ColorSets the background color for selected emoji in the top slider.set(activeEmojiBackgroundColor: UIColor)
Slider Emoji Count ColorSets the UIColor for emojies count text in the top slidersl.set(sliderEmojiCountColor: UIColor)
Error Text ColorSets the color for error text.set(errorTextColor: UIColor)
Error TextFontSets the error font.set(errorTextFont: UIFont)
Loading TintSets the loading tint color for loading spinner.set(loadingTint: UIColor)
Active Emoji Corner RadiusSets the corner radius for selected emoji in the top slider.set(activeEmojiCornerRadius: CometChatCornerStyle)
2. Avatar Style 🛑
If you want to apply customized styles to the Avatar component within the Reaction List Component, you can use the following code snippet. For more information you can refer Avatar Styles. 
let avatarStyle = AvatarStyle()
    .set(background: .red)
    .set(borderColor: .green)

let reactionListConfiguration = ReactionListConfiguration()
    .set(avatarStyle: avatarStyle)

let messageListConfiguration = MessageListConfiguration()
    .set(reactionListConfiguration: reactionListConfiguration)

let messagesConfiguration = MessagesConfiguration()
    .set(messageListConfiguration: messageListConfiguration)

let cometChatConversationsWithMessages = CometChatConversationsWithMessages()
    .set(messagesConfiguration: messagesConfiguration)
3. ListItem Style
If you want to apply customized styles to the ListItemStyle component within the Reaction List Component, you can use the following code snippet. For more information, you can refer ListItem Styles. 
let listitemStyle  = ListItemStyle()
    .set(background: .lightGray)
    .set(borderColor: .cyan)
    .set(titleColor: .black)
    .set(selectionIconTint: .green)

let reactionListConfiguration = ReactionListConfiguration()
    .set(listItemStyle: listitemStyle)

let messageListConfiguration = MessageListConfiguration()
    .set(reactionListConfiguration: reactionListConfiguration)

let messagesConfiguration = MessagesConfiguration()
    .set(messageListConfiguration: messageListConfiguration)

let cometChatConversationsWithMessages = CometChatConversationsWithMessages()
    .set(messagesConfiguration: messagesConfiguration)

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Functionality

These functional customizations provide ways to enhance the component’s overall experience. They allow for text modification, custom icon setting, and UI element visibility toggling. The Reactions List component does not offer any additional functionality.

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Advanced

For advanced-level customization, you can set custom views to the component. This lets you tailor each aspect of the component to fit your exact needs and application aesthetics. You can create and define your views, layouts, and UI elements and then incorporate those into the component.

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Loading State View

You can customize the loading state view in your Reaction List by using the .setLoadingStateView() method. This method allows you to set a custom loading view that will be displayed while the reaction list is loading. It’s important to note that using this method will override the default loading state functionality of the component. 
let reactionListConfiguration = ReactionListConfiguration()
    .set(loadingStateView: UIView?)
Example In this example, we will create a UIView file custom_loading_View.
CustomLoadingView
class CustomLoadingView: UIView {
    let activityIndicator = UIActivityIndicatorView(style: .large)

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = UIColor.black.withAlphaComponent(0.8)
        setupActivityIndicatorView()
    }

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

    private func setupActivityIndicatorView() {
        addSubview(activityIndicator)
        activityIndicator.startAnimating()
    }
}
we will pass the custom_loading_View to ReactionListConfiguration.
Swift
let customLoadingView = CustomLoadingView()

let reactionListConfiguration = ReactionListConfiguration()
    .set(loadingStateView: customLoadingView)

let messageListConfiguration = MessageListConfiguration()
    .set(reactionListConfiguration: reactionListConfiguration)

let messagesConfiguration = MessagesConfiguration()
    .set(messageListConfiguration: messageListConfiguration)

let cometChatConversationsWithMessages = CometChatConversationsWithMessages()
    .set(messagesConfiguration: messagesConfiguration)
Ensure to pass and present CometChatConversationsWithMessages. If a navigation controller is already in use, utilize the pushViewController function instead of directly presenting the view controller.

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Error State View

You can customize the error state view in your Reaction List by using the .setErrorStateView() method. This method allows you to set a custom error view that will be displayed when there’s an error in loading the reaction list. It’s important to note that using this method will override the default error state functionality of the component. 
 let reactionListConfiguration = ReactionListConfiguration()
    .set(errorStateView: UIView?)
Example In this example, we will create a UIView file Custom_Error_View.
CustomLoadingView
import UIKit

class CustomErrorView: UIView {
    private let errorLabel = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupErrorLabel()
    }

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

    private func setupErrorLabel() {
        errorLabel.translatesAutoresizingMaskIntoConstraints = false
        errorLabel.text = "An error occurred. Please try again."
        errorLabel.textAlignment = .center
        errorLabel.textColor = .white
        errorLabel.font = UIFont.systemFont(ofSize: 15, weight: .medium)
        addSubview(errorLabel)

        NSLayoutConstraint.activate([
            errorLabel.centerXAnchor.constraint(equalTo: self.centerXAnchor),
            errorLabel.centerYAnchor.constraint(equalTo: self.centerYAnchor)
        ])

        self.backgroundColor = .red
    }
}
we will pass the Custom_Error_View to ReactionListConfiguration.
Swift
let customErrorView = CustomErrorView()

let reactionsRequestbuilder = ReactionsRequestBuilder()
    .set(limit: 1000)

let reactionListConfiguration = ReactionListConfiguration()
    .set(errorStateView: customErrorView)
    .set(reactionRequestBuilder: reactionsRequestbuilder)

let messageListConfiguration = MessageListConfiguration()
    .set(reactionListConfiguration: reactionListConfiguration)

let messagesConfiguration = MessagesConfiguration()
    .set(messageListConfiguration: messageListConfiguration)

let cometChatConversationsWithMessages = CometChatConversationsWithMessages()
    .set(messagesConfiguration: messagesConfiguration)
Ensure to pass and present CometChatConversationsWithMessages. If a navigation controller is already in use, utilize the pushViewController function instead of directly presenting the view controller.