Type-safe Programming Practice in Swift

Swift 类型安全编程实践
2015年12月20日在 SwiftCon AlphaShow 沙龙上的分享

Transcript

1. Swift ᔄࣳਞق ᖫᑕਫ᪢ @hankbao 1
2. ՗ Obj-C ک Swift ౯ժ឴஑ԧՋԍ! @hankbao 2
3. ᑮ؀ — C: NULL — Objective-C: nil — Swift: Optional<T>.None @hankbao 3
4. Კ᧏ — ᖫᦲᲙ᧏ — ෙ᥺०ᨳ — ᬩᤈ෸Კ᧏ @hankbao 4
5. ᖫᦲᲙ᧏ @hankbao 5
6. ෙ᥺०ᨳ @hankbao 6
7. ᬩᤈ෸Კ᧏ @hankbao 7
8. Ոᙂ༄ၥ let img = UIImage(named: "project")! @hankbao 8
9. ᖫᦲ࢏༄ၥ extension UIImage { enum Asset: String { case Favorite = "favorite" case Project = "project" ... } convenience init(asset: Asset) { ... } } let img = UIImage(asset: .Project) @hankbao 9
10. ᔄࣳਞقጱᩒრᓕቘ — R.swift — SwiftGen — Shark — Laurine @hankbao 10
11. ᔄࣳਞق — ᩒრᓕቘ — ᭗Ꭳݷᑍ — ࢶᇆݷᑍ — UI ਁᒧԀ — ... — AnyObject => T @hankbao 11
12. DataSource struct User { let id: String let name: String } struct Channel { let id: String let title: String } @hankbao 12
13. DataSource class DataSource<Item>: NSObject, UITableViewDataSource { typealias Configure = (cell: UITableViewCell, item: Item) -> UITableViewCell } tableView.dataSource = DataSource<?>(configure: ...) @hankbao 13
14. DataSource enum DataItem { case UserItem(user: User) case ChannelItem(channel: Channel) } @hankbao 14
15. DataSource protocol ReuseIdentifierType { var reuseID: String { get } } extension DataItem: ReuseIdentifierType { var reuseID: String { switch self { case .UserItem: return "user_cell" case .ChannelItem: return "channel_cell" } } } @hankbao 15
16. DataSource class DataSource<Item: ReuseIdentifierType>: NSObject, UITableViewDataSource { func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let item = items[indexPath.row] let cell = tableView.dequeueReusableCellWithIdentifier(item.reuseID, forIndexPath: indexPath) return configure(cell: cell, item: item) } ... } @hankbao 16
17. ݇ᘍᩒා — The Swift Programming Language — WWDC — objc.io — realm.io @hankbao 17
18. Thanks @hankbao 18