The document defines a Timeline struct that conforms to a DataType protocol. The Timeline struct stores an array of Tweet objects and provides methods to insert, delete, and retrieve Tweets from the array. The DataType protocol defines requirements for a type that manages an array of items including methods to insert, delete, and access items.

23. class TimelineTableViewController: UITableViewController {
var tweets: [Tweet] = []
func tableView(tableView: UITableView, numberOfRowsInSection
section: Int) -> Int {
return tweets.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath
indexPath: NSIndexPath) -> UITableViewCell {
return UITableViewCell()
}
}

24. class TimelineTableViewController: UITableViewController {
private let timelineDataSource = TimelineDataSource()
private let timelineDelegate = TimelineDelegate()
override func viewDidLoad() {
tableView.dataSource = timelineDataSource
tableView.delegate = timelineDelegate
}

25. class TimelineDataSource: NSObject, UITableViewDataSource {
var tweets: [Tweet] = []
func tableView(tableView: UITableView, numberOfRowsInSection section:
Int) -> Int {
return tweets.count
}

26. import UIKit
class KobitoSettingViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, KobitoCollectionViewCellDelegate {
var delegate: BackDelegate?
@IBOutlet weak var kobitoMediumImageView: UIImageView!
@IBOutlet weak var kobitoNameLabel: UILabel!
@IBOutlet weak var collectionView: UICollectionView!
@IBOutlet weak var backButton: UIButton!
@IBOutlet weak var gotchaButton: UIButton!
var isShowedKobitoDetailView = false
var currentSelectedIndex: Int {
return KobitoManager.sharedManager.currentKobito.type.rawValue
}
override func viewDidLoad() {
backButton.imageView?.contentMode = .ScaleAspectFit
gotchaButton.imageView?.contentMode = .ScaleAspectFit
kobitoMediumImageView.image = KobitoManager.sharedManager.currentKobito.type.miniImage
kobitoNameLabel.text = KobitoManager.sharedManager.currentKobito.type.name
automaticallyAdjustsScrollViewInsets = false
var cellSide:CGFloat = 0
var lrMargin:CGFloat = 0
var tbMargin:CGFloat = 0
// これはした方がいいかも.
if collectionView.frame.height/2 < collectionView.frame.width/3 {
tbMargin = 4
cellSide = (collectionView.frame.size.height - (tbMargin * 4)) / 2
lrMargin = (collectionView.frame.size.width - (cellSide * 3)) / 6
}else {
lrMargin = 2
cellSide = (collectionView.frame.size.width - (lrMargin * 6)) / 3
tbMargin = (collectionView.frame.size.height - (cellSide * 2)) / 4
}
let layout = UICollectionViewFlowLayout()
layout.itemSize = CGSize(width: cellSide, height: cellSide)
layout.sectionInset = UIEdgeInsets(top: tbMargin, left: lrMargin, bottom: tbMargin, right: lrMargin)
collectionView.collectionViewLayout = layout
collectionView.delegate = self
collectionView.dataSource = self
}
override func viewDidAppear(animated: Bool) {
showCurrentSelectedMark()
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
return 12
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
return 0
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 6
}

32. class Timeline {
private var tweets: [Tweet] = []
init(tweets: [Tweet]) {
self.tweets = tweets
}
var numberOfTweet: Int {
return tweets.count
}
subscript(index: Int) -> Tweet {
return tweets[index]
}
private func insertTweetAtIndex(tweet: Tweet, index: Int) {
tweets.insert(tweet, atIndex: index)
}

33. class TimelineDataSource: NSObject, UITableViewDataSource {
var timeline: Timeline = Timeline(tweets: [])
func tableView(tableView: UITableView, numberOfRowsInSection section:
Int) -> Int {
return timeline.numberOfTweet
}

36. struct Timeline {
private var tweets: [Tweet] = []
init(tweets: [Tweet]) {
self.tweets = tweets
}
var numberOfTweet: Int {
return tweets.count
}
subscript(index: Int) -> Tweet {
return tweets[index]
}

37. private func insertTweetAtIndex(tweet: Tweet, index: Int) -> Timeline {
var mutableTweets = tweets
mutableTweets.insert(tweet, atIndex: index)
return Timeline(tweets: mutableTweets)
}

38. func favoriteTweetAtIndex(index: Int) -> Timeline {
let cacheTweet = items[index]
let tweet = Tweet(
id: cacheTweet.id,
text: cacheTweet.text,
favorited: !cacheTweet.favorited,
retweeted: cacheTweet.retweeted,
user: cacheTweet.user)
return deleteItemAtIndex(index).insertItemAtIndex(tweet, index: index)
}

41. private func insertTweetAtIndex(tweet: Tweet, index: Int) -> Timeline {
var mutableTweets = tweets
mutableTweets.insert(tweet, atIndex: index)
return Timeline(tweets: mutableTweets)
}

42. private func insertItemAtIndex(item: Item, index: Int) -> Timeline {
var mutableItems = Items
mutableItems.insert(item, atIndex: index)
return Timeline(tweets: mutableItems)
}

43. protocol DataType {
associatedtype ItemType
var items: [ItemType] { get }
var numberOfItems: Int { get }
subscript(index: Int) -> ItemType { get }
func insertItemAtIndex(item: ItemType, index: Int) -> Self
func deleteItemAtIndex(index: Int) -> Self
}

44. protocol DataType {
associatedtype ItemType
var items: [ItemType] { get }
var numberOfItems: Int { get }
subscript(index: Int) -> ItemType { get }
func insertItemAtIndex(item: ItemType, index: Int) -> Self
func deleteItemAtIndex(index: Int) -> Self
}

45. protocol DataType {
associatedtype ItemType
var items: [ItemType] { get }
var numberOfItems: Int { get }
subscript(index: Int) -> ItemType { get }
func insertItemAtIndex(item: ItemType, index: Int) -> Self
func deleteItemAtIndex(index: Int) -> Self
}

46. protocol DataType {
associatedtype ItemType
var items: [ItemType] { get }
var numberOfItems: Int { get }
subscript(index: Int) -> ItemType { get }
func insertItemAtIndex(item: ItemType, index: Int) -> Self
func deleteItemAtIndex(index: Int) -> Self
}

47. struct Timeline: DataType {
typealias ItemType = Tweet
var items: [ItemType] = []
init(items: [ItemType]) {
self.items = items
}
var numberOfItems: Int {
return items.count
}
subscript(index: Int) -> Tweet {
return items[index]
}
func insertItemAtIndex(item: ItemType, index: Int) -> Timeline {
var mutableItems = items
mutableItems.insert(item, atIndex: index)
return Timeline(items: mutableItems)
}

48. func favoriteTweetAtIndex(index: Int) -> Timeline {
let cacheTweet = items[index]
let tweet = Tweet(
id: cacheTweet.id,
text: cacheTweet.text,
favorited: !cacheTweet.favorited,
retweeted: cacheTweet.retweeted,
user: cacheTweet.user)
return deleteItemAtIndex(index).insertItemAtIndex(tweet, index: index)
}

55.
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