TimelineViewControllerは 1−6.タイムラインを表示 まで行くと多分こうなる #CodePiece #realm_swift #realm_jp

CodePiece.swift

import UIKit
import Accounts
import Social
import RealmSwift

class TimelineViewController: UITableViewController {

    var timeline: Results<Tweet>?
    var notificationToken: NotificationToken?

    var account: ACAccount?

    override func viewDidLoad() {
        super.viewDidLoad()

        // アカウントを取得してメンバ変数 var account: ACAccount? に格納
        let accountStore = ACAccountStore()
        let accountType = accountStore.accountTypeWithAccountTypeIdentifier(ACAccountTypeIdentifierTwitter)
        accountStore.requestAccessToAccountsWithType(accountType, options: nil) { (granted, error) -> Void in
            if granted {
                let accounts = accountStore.accountsWithAccountType(accountType)
                if let account = accounts.first as? ACAccount {
                    self.account = account
                    self.getHomeTimeline()
                } else {
                    self.showAlert("No Twitter account")
                }
            } else {
                self.showAlert("No account access")
            }
        }

        // TableViewにTimelineCellを表示する準備
        tableView.registerNib(UINib(nibName: "TimelineCell", bundle: nil), forCellReuseIdentifier: "timelineCell")
        tableView.rowHeight = 90
        tableView.estimatedRowHeight = 90

        // RealmからcreatedAtでソートしたタイムラインを取得するクエリを発行
        let realm = try! Realm()
        // RealmからTweetクラスのオブジェクトを検索
        timeline = realm.objects(Tweet).sorted("createdAt", ascending: false)
        //　クエリに変更があった場合に通知を受けて実行したい処理を登録
        notificationToken = timeline?.addNotificationBlock { [weak self] (change) in
            switch change {
            case .Initial(_):
                self?.tableView.reloadData()
            case .Update(_, deletions: _, insertions: _, modifications: _):
                self?.tableView.reloadData()
            case .Error(_):
                return
            }
        }
    }

    // MARK: - Twitter API

    // メンバ変数 var account: ACAccount? をつかってAPIからタイムラインを取得
    func getHomeTimeline() {
        let requestURL = NSURL(string: "https://api.twitter.com/1/statuses/home_timeline.json")
        let request = SLRequest(forServiceType: SLServiceTypeTwitter, requestMethod: .GET, URL: requestURL, parameters: nil)
        request.account = account

        request.performRequestWithHandler { (data, response, error) -> Void in
            if let error = error {
                self.showAlert(error.localizedDescription)
                return
            }

            do {
                let results = try NSJSONSerialization.JSONObjectWithData(data, options: [])
                if let results = results as? NSDictionary {
                    let errors = results["errors"] as! [[String: AnyObject]]
                    let message = errors.last!["message"] as! String
                    self.showAlert(message)
                    return
                }

                let timeline = results as! [[String: AnyObject]]

                let realm = try! Realm()
                try! realm.write {
                    timeline.forEach { (tweetDictionary) -> () in
                        let tweet = Tweet(tweetDictionary: tweetDictionary)
                        realm.add(tweet)
                    }
                }
            } catch let error as NSError {
                self.showAlert(error.localizedDescription)
            }
        }
    }

    // MARK: - Alert (TwitterAPIのエラー、OSに設定されたTwitterアカウントの取得エラーを表示)

    func showAlert(message: String) {
        dispatch_async(dispatch_get_main_queue()) {
            let alertController = UIAlertController(title: "Error", message: message, preferredStyle: .Alert)
            alertController.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
            self.presentViewController(alertController, animated: true, completion: nil)
        }
    }

    // MARK: - UITableViewDataSource

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return timeline?.count ?? 0
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("timelineCell", forIndexPath: indexPath) as! TimelineCell

        let tweet = timeline![indexPath.row]

        cell.nameLabel.text = tweet.name
        cell.tweetTextView.text = tweet.text

        NSURLSession.sharedSession().dataTaskWithRequest(NSURLRequest(URL: NSURL(string: tweet.iconURL)!)) { (data, response, error) -> Void in
            if let _ = error {
                return
            }

            dispatch_async(dispatch_get_main_queue()) {
                let image = UIImage(data: data!)!
                cell.iconView.image = image
            }
            }.resume()

        return cell
    }

    override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return UITableViewAutomaticDimension
    }
    
}