NSScreencast Episode #129 Swift JSON

Swift JSON - NSScreencast

SwiftをJSONをパース

• Obj-Cの方がSwiftよりJSONパースが適当に実装できる
  • parsing JSON (which provides no contracts or type guarantees) can be difficult and tedious in Swift.
  • Many of the problems you are forced to deal with were easier to ignore in Objective-C
• func parseJson
  • var error: NSError?
  • let json: AnyObject = NSJSONSerialization.JSONObjectWithData
  • if error {
  • else
    • completion(json)
• struct Episode
• func parseEpisodes(json: AnyObject) -> [Episode]
  • if let array = json as? [ [ String : AnyObject ] ]
• func parseEpisode(dict: [ String : AnyObject ]) -> Episode?
  • if let id = dict["id"] as? NSNumber {
    • if let title = dict["title"] as? NSString {
      • if let description = dict["description"] as? NSString {
        • if let number = dict["episode_number"] as? NSNumber {

自分で毎回いちいち書くとしたら面倒そう