ultimate-vim/sources_non_forked/swift.vim/example/MainViewController.swift

//
//  MainViewController.swift
//  HackerNews
//
//  Copyright (c) 2014 Amit Burstein. All rights reserved.
//  See LICENSE for licensing information.
//
//  Abstract:
//      Handles fetching and displaying posts from Hacker News.
//

import UIKit
import QuartzCore

class MainViewController: UIViewController, UITableViewDataSource {

    // MARK: Properties

    let postCellIdentifier = "PostCell"
    let showBrowserIdentifier = "ShowBrowser"
    var postFilter = PostFilterType.Top
    var posts = HNPost[]()
    var refreshControl = UIRefreshControl()
    @IBOutlet var tableView: UITableView

    // MARK: Lifecycle

    override func viewDidLoad() {
        super.viewDidLoad()
        configureUI()
        fetchPosts()
    }

    override func viewWillAppear(animated: Bool) {
        tableView.deselectRowAtIndexPath(tableView.indexPathForSelectedRow(), animated: animated)
        super.viewWillAppear(animated)
    }

    // MARK: Functions

    func configureUI() {
        refreshControl.addTarget(self, action: "fetchPosts", forControlEvents: .ValueChanged)
        refreshControl.attributedTitle = NSAttributedString(string: "Pull to Refresh")
        tableView.insertSubview(refreshControl, atIndex: 0)
    }

    func fetchPosts() {
        UIApplication.sharedApplication().networkActivityIndicatorVisible = true;

        HNManager.sharedManager().loadPostsWithFilter(postFilter, completion: { posts in
            if (posts != nil && posts.count > 0) {
                self.posts = posts as HNPost[]
                dispatch_async(dispatch_get_main_queue(), {
                    self.tableView.reloadSections(NSIndexSet(index: 0), withRowAnimation: .Fade)
                    self.refreshControl.endRefreshing()
                    UIApplication.sharedApplication().networkActivityIndicatorVisible = false
                })
            } else {
                println("Could not fetch posts!")
                self.refreshControl.endRefreshing()
                UIApplication.sharedApplication().networkActivityIndicatorVisible = false;
            }
        })
    }

    func stylePostCellAsRead(cell: UITableViewCell) {
        cell.textLabel.textColor = UIColor(red: 119/255.0, green: 119/255.0, blue: 119/255.0, alpha: 1)
        cell.detailTextLabel.textColor = UIColor(red: 153/255.0, green: 153/255.0, blue: 153/255.0, alpha: 1)
    }

    // MARK: UITableViewDataSource

    func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
        return posts.count
    }

    func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
        let cell = tableView.dequeueReusableCellWithIdentifier(postCellIdentifier) as UITableViewCell

        let post = posts[indexPath.row]

        if HNManager.sharedManager().hasUserReadPost(post) {
            stylePostCellAsRead(cell)
        }

        cell.textLabel.text = post.Title
        cell.detailTextLabel.text = "\(post.Points) points by \(post.Username)"

        return cell
    }

    // MARK: UIViewController

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject) {
        if segue.identifier == showBrowserIdentifier {
            let webView = segue.destinationViewController as BrowserViewController
            let cell = sender as UITableViewCell
            let post = posts[tableView.indexPathForCell(cell).row]

            HNManager.sharedManager().setMarkAsReadForPost(post)
            stylePostCellAsRead(cell)

            webView.post = post
        }
    }

    // MARK: IBActions

    @IBAction func changePostFilter(sender: UISegmentedControl) {
        switch sender.selectedSegmentIndex {
        case 0:
            postFilter = .Top
            fetchPosts()
        case 1:
            postFilter = .New
            fetchPosts()
        case 2:
            postFilter = .Ask
            fetchPosts()
        default:
            println("Bad segment index!")
        }
    }
}