在ios swift中覆蓋文本文件

Question

我在應用程序開始時從互聯網下載文件，然後在本地保存並使用其數據。我希望下載的文件在開始時每次都覆蓋前一個文件，但是我無法獲取覆蓋的數據，它會一直顯示前一個文件。如果我通過檢查它是否存在刪除它，那麼它會給出一個錯誤「無法複製到」Documents「，因爲具有相同名稱的項目已經存在。」「。如果a不創建新文件檢查它的存在，然後它給這個錯誤：

"Error took place while reading from file. Error description: %@ The file 「Splashk.text」 couldn’t be opened because there is no such file."

這是我的代碼：

// checking file existence 
do{ 
    let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String 
    let url = URL(fileURLWithPath: path) 
    let filePath = url.appendingPathComponent("Splashk.text").path 
    let fileManager1 = FileManager.default 
    if fileManager1.fileExists(atPath: filePath) { // if available, delete the file and re create an empty file 
     print("FILE AVAILABLE") 
     try fileManager1.removeItem(atPath: filePath) 
     if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first { 
      let path = dir.appendingPathComponent("Splashk.text") 
      // writing 
      do { 
       try text.write(to: path, atomically: true, encoding: String.Encoding.utf8) 
      } 
      catch {/* error handling here */} 
     } 
    } else { // if not available, create an empty file 
     print("FILE NOT AVAILABLE") 
     if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first { 
      let path = dir.appendingPathComponent("Splashk.text") 
      // writing 
      do { 
       try text.write(to: path, atomically: true, encoding: String.Encoding.utf8) 
      } 
      catch {/* error handling here */} 
     } 
    } 
} 
catch let error as NSError { 
    print("An error took place: \(error)") 
} 
// getting the file path for destination file 
let documentsUrl:URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL!//try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true) as URL! 
let destinationFileUrl = documentsUrl.appendingPathComponent("Splashk.text") 

let empId = self.defaults.object(forKey: "EmpId") as! String 
// fileURL got the online url from which file is getting downloaded 
let fileURL = URL(string:(defaults.object(forKey: "MainAddress") as! String).appending(download url) 

let sessionConfig = URLSessionConfiguration.default 
let session1 = URLSession(configuration: sessionConfig) 

let request = URLRequest(url:fileURL!) 
let task1 = session1.downloadTask(with: request) { (tempLocalUrl, response, error) in 
    if let tempLocalUrl = tempLocalUrl, error == nil { 
     // Success 
     if let statusCode = (response as? HTTPURLResponse)?.statusCode { 
      print("Successfully downloaded. Status code: \(statusCode)") // it is 200 
     } 
     do { 
      print("temp local url \(tempLocalUrl)") 
      try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl) 
      let fileManager = FileManager.default 
      // Check if file exists 
     } catch (let writeError) { 
      print("Error creating a file \(destinationFileUrl) : \(writeError)") // 
     } 
    } else { 
     print("Error took place while downloading a file. Error description: %@", error?.localizedDescription); 
    } 
} 
task1.resume() 

//reading back from the destination file 
do { 
    str = try String(contentsOf: destinationFileUrl, encoding: String.Encoding.utf8) as NSString 
    print("file text = \(str)") 
    parseXML() 
} catch {/* error handling here */ 
    print("Error took place while reading from file. Error description: %@", error.localizedDescription) 
} 

Answer 1

試試這行代碼中，我使用它和它的作品

let fileManger = FileManager.default 
let doumentDirectoryPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString 
let filePath = doumentDirectoryPath.appendingPathComponent("Splashk.text") 
if fileManger.fileExists(atPath: filePath){ 
    do{ 
     try fileManger.removeItem(atPath: filePath) 
    }catch let error { 
     print("error occurred, here are the details:\n \(error)") 
    } 
}