SWIFT使用數組和字典

Question

我正在嘗試通過數組中的segue將信息傳遞給第二個控制器：

var gists = [Gists]()

這就是我對方法prepare（for segue：的實現

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "detailSegue" {
            if let indexPath = tableView.indexPathForSelectedRow {
                 guard let dvc = segue.destination as? DetailViewController else { return }
                dvc.filename = gists[indexPath.row].files.key // type String
                dvc.rawUrl = gists[indexPath.row].files.value // type String
            }
        }
    }

這是我的數組要點的轉儲：

▿ 2 elements
  ▿ GistShowApp.Gists
    ▿ description: Optional("mySecondGist")
      - some: "mySecondGist"
    ▿ files: 1 key/value pair
      ▿ (2 elements)
        - key: "gistfile1.txt"
        ▿ value: GistShowApp.DetailGist
          ▿ filename: Optional("gistfile1.txt")
            - some: "gistfile1.txt"
          ▿ rawUrl: Optional("https://gist.githubusercontent.com/VladimirKhuraskin/9ca2362c09cebcc16bd74f51f267231a/raw/74caacd3ad3eedb369a07b926327d2ef37e3eefc/gistfile1.txt")
            - some: "https://gist.githubusercontent.com/VladimirKhuraskin/9ca2362c09cebcc16bd74f51f267231a/raw/74caacd3ad3eedb369a07b926327d2ef37e3eefc/gistfile1.txt"
  ▿ GistShowApp.Gists
    ▿ description: Optional("helloWorldDemo")
      - some: "helloWorldDemo"
    ▿ files: 1 key/value pair
      ▿ (2 elements)
        - key: "gistfile1.txt"
        ▿ value: GistShowApp.DetailGist
          ▿ filename: Optional("gistfile1.txt")
            - some: "gistfile1.txt"
          ▿ rawUrl: Optional("https://gist.githubusercontent.com/VladimirKhuraskin/c510014b85a6bdfa302f1f3837893a7c/raw/4648e701849ee7d52fb685111a7f0e4323505a35/gistfile1.txt")
            - some: "https://gist.githubusercontent.com/VladimirKhuraskin/c510014b85a6bdfa302f1f3837893a7c/raw/4648e701849ee7d52fb685111a7f0e4323505a35/gistfile1.txt"
2018-06-30 15:30:26.336720+0400 GistShowApp[1889:720551] [Snapshotting] Snapshotting a view (0x134032c00, UIKeyboardImpl) that is not in a visible window requires afterScreenUpdates:YES.

也就是說，我有一組元素gist ，每個元素由一個字符串和一個字典組成。 反過來，此字典的類型為[String：String] 。 而且我需要傳遞密鑰和相應的值。

Xcode在這些行上產生錯誤。 如何正確書寫？

dvc.filename = gists[indexPath.row].files.key
dvc.rawUrl = gists[indexPath.row].files.value

Answer 1

gists[indexPath.row].files是一本字典，因此您需要將dvc.filename和dvc.rawUrl設置dvc.filename dvc.rawUrl中的一個條目，或將整個字典傳遞給詳細視圖控制器。

對於第一種選擇：

dvc.filename = gists[indexPath.row].files["gistfile1.txt"].filename
dvc.rawUrl = gists[indexPath.row].files["gistfile1.txt"].rawURL