无法覆盖文本文件

Question

我每次启动应用程序时都试图覆盖现有文件。我试过两件事都不起作用。

1）我试图创建从在线服务器下载的文件名相同，但文件中的数据没有更新，我的代码是..

 let documentsUrl:URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL!
            let destinationFileUrl = documentsUrl.appendingPathComponent("Splash.text")

            let fileURL = URL(string:(defaults.object(forKey: "MainAddress") as! String).appending(filedownloadLink)
            print("proper url = \(String(describing: fileURL))")


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

            print("splash file url \(destinationFileUrl)")
            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)")
                    }
                    do {
                        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()

2）然后我尝试在创建之前检查文件，如果它存在，那么我将其删除。但是一旦文件被删除，就不会打开文件＆＃34; splash.text＆＃34;不存在。下面是代码

 do{
                let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
                let url = URL(fileURLWithPath: path)
                let filePath = url.appendingPathComponent("Splash.text").path
                let fileManager1 = FileManager.default
                if fileManager1.fileExists(atPath: filePath) {
                    print("FILE AVAILABLE")
                     try fileManager1.removeItem(atPath: filePath)


                } else {
                    print("FILE NOT AVAILABLE")

                }
            }
            catch let error as NSError {
                print("An error took place: \(error)")
            }

在此代码之后，我调用了方法1的代码。我不确定为什么不再为第二种方法创建它，或者为什么它不会在第一种方法中覆盖它。