ユーザー解析機能が無料になったFirebaseの使い方超入門：Swift製リアルタイムチャットアプリ開発で学ぶ（1/4 ページ）

use_frameworks!
 
target :FirebaseSample do
  pod 'JSQMessagesViewController'
end

import UIKit
import JSQMessagesViewController
 
class ViewController: JSQMessagesViewController {
    var messages: [JSQMessage] = [
        JSQMessage(senderId: "Dummy",  displayName: "A", text: "こんにちは!"),
        JSQMessage(senderId: "Dummy2", displayName: "B", text: "こんにちは♪")
    ]
 
    override func viewDidLoad() {
        super.viewDidLoad()
 
        senderDisplayName = "A"
        senderId = "Dummy"
    }
 
    override func collectionView(collectionView: JSQMessagesCollectionView!, messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageData! {
        return messages[indexPath.row]
    }
 
    override func collectionView(collectionView: JSQMessagesCollectionView!, messageBubbleImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageBubbleImageDataSource! {
        if messages[indexPath.row].senderId == senderId {
            return JSQMessagesBubbleImageFactory().outgoingMessagesBubbleImageWithColor(
                UIColor(red: 112/255, green: 192/255, blue:  75/255, alpha: 1))
        } else {
            return JSQMessagesBubbleImageFactory().incomingMessagesBubbleImageWithColor(
                UIColor(red: 229/255, green: 229/255, blue: 229/255, alpha: 1))
        }
    }
 
    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
 
        let cell = super.collectionView(collectionView, cellForItemAtIndexPath: indexPath) as? JSQMessagesCollectionViewCell
        if messages[indexPath.row].senderId == senderId {
            cell?.textView?.textColor = UIColor.whiteColor()
        } else {
            cell?.textView?.textColor = UIColor.darkGrayColor()
        }
        return cell!
    }
 
    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return messages.count
    }
 
    override func collectionView(collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! {
 
        return JSQMessagesAvatarImageFactory.avatarImageWithUserInitials(
            messages[indexPath.row].senderDisplayName,
            backgroundColor: UIColor.lightGrayColor(), textColor: UIColor.whiteColor(),
            font: UIFont.systemFontOfSize(10), diameter: 30)
    }
}