從目錄中的所有rtf文件讀取文本並創建主文件swift

Question

上下文我有一個應用程序，用戶可以在其中編寫多個“場景”。 這些文件另存為單獨的文件。 我需要為用戶提供2個導出選項（將所有場景單獨導出或全部導出到一個主文件中）。

我該怎么辦目前，我的方法是嘗試檢索擴展名為.rtf的每個文件的URL。 然后遍歷每個對象，提取NSAttributedString。 最后，我計划依次將每個文件寫入一個主.rtf文件。

我嘗試了什么使用其他各種答案的想法（例如， 在這里和這里就類似的問題，我正在嘗試以下我已經注釋過的問題。不用說，我對下一步的工作感到困惑和迷茫：

@IBAction func exportPressed(_ sender: Any) {
        //THIS BIT RETRIEVES THE URLS OF EACH .RTF FILE AND PUTS THEM INTO AN ARRAY CALLED SCENEURLS. THIS BIT WORKS FINE AND I'VE TESTED BY PRINTING OUT A LIST OF THE URLS.

        do {
            let documentsURL = getDocumentDirectory()
            let docs = try FileManager.default.contentsOfDirectory(at: documentsURL, includingPropertiesForKeys: [], options:  [.skipsHiddenFiles, .skipsSubdirectoryDescendants])
            let scenesURLs = docs.filter{ $0.pathExtension == "rtf" }

//THIS BIT TRYS TO RETURN THE NSATTRIBUTEDSTRING FOR EACH OF THE SCENE URLS. THIS BIT THROWS UP MULTIPLE ERRORS. I SUPPOSE I WOULD WANT TO ADD THE STRINGS TO A NEW ARRAY [SCENETEXTSTRINGS] SO I COULD THEN LOOP THROUGH THAT AND WRITE THE NEW MASTER FILE WITH TEXT FROM EACH IN THE RIGHT ORDER.

            scenesURLs.forEach {_ in

                return try NSAttributedString()(url: scenesURLs(),
                                                options: [.documentType: NSAttributedString.DocumentType.rtf],
                                                documentAttributes: nil)
            } catch {

                print("failed to populate text view with current scene with error: \(error)")

                return nil
            }
            }
        } catch {
            print(error)
        }

//THERE NEEDS TO BE SOMETHING HERE THAT THEN WRITES THE STRINGS IN THE NEW STRINGS ARRAY TO A NEW MASTER FILE
    }

首先，我只需要一些如何獲取數組中的字符串的幫助-之后，我可以嘗試編寫新的master！

Answer 1

如果要從文件URL數組中NSAttributedString數組，則可以使用map代替forEach 。 您還需要解決幾個語法問題。

將您對forEach的使用替換為：

let attributedStrings = scenesURLs.compactMap { (url) -> NSAttributedString? in
    do {
        return try NSAttributedString(url: url, options: [.documentType: NSAttributedString.DocumentType.rtf], documentAttributes: nil)
    } catch {
        print("Couldn't load \(url): \(error)")
        return nil
    }
}

如果您不關心記錄錯誤，可以將其簡化為：

let attributedStrings = scenesURLs.compactMap {
    return try? NSAttributedString(url: $0, options: [.documentType: NSAttributedString.DocumentType.rtf], documentAttributes: nil)
}

要從數組創建一個最終的NSAttributedString ，可以執行以下操作：

let finalAttributedString = attributedStrings.reduce(into: NSMutableAttributedString()) { $0.append($1) }