NSFileManager fileExistsAtPath无法覆盖Swift 2中的现有文件

你好我正在升级我的现有代码到Swift 2，并且我需要一些DocumentDirectoy中的文件副本的帮助。NSFileManager fileExistsAtPath无法覆盖Swift 2中的现有文件

这是我用来检查文件是否存在的转换代码，如果存在，我们应该复制它，但它会一直返回一个错误，指出文件存在，这是真的，但我们需要覆盖它。

func copyXMLFile() 
    { 
    // Get a reference for the Document directory 
    let rootPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, .UserDomainMask, true)[0] 
    // Get a reference for the data.xml file 
    xmlPathInDocument = rootPath.stringByAppendingString("data.xml") 
    if NSFileManager.defaultManager().fileExistsAtPath(xmlPathInDocument){ 
     print("xml file exists") 

       let xmlPathInBundle = NSBundle.mainBundle().pathForResource("data", ofType: "xml")! 
     do { 
      // copy file from main bundle to documents directory 
      print("copy") 
      try NSFileManager.defaultManager().copyItemAtPath(xmlPathInBundle, toPath: xmlPathInDocument) 
     } catch let error as NSError { 
      // Catch fires here, with an NSErrro being thrown 
      print("error occurred, here are the details:\n \(error)") 
     } 
    } 
    else 
    { 
     // copy the file either way 

     let xmlPathInBundle = NSBundle.mainBundle().pathForResource("data", ofType: "xml")! 
     do { 
      // copy file from main bundle to documents directory 
      print("copy") 
      try NSFileManager.defaultManager().copyItemAtPath(xmlPathInBundle, toPath: xmlPathInDocument) 
     } catch let error as NSError { 
      // Catch fires here, with an NSErrro being thrown 
      print("error occurred, here are the details:\n \(error)") 
     } 

    } 

}

发生错误，下面是详细信息：

Error Domain=NSCocoaErrorDomain Code=516 "The operation couldn’t be completed. (Cocoa error 516.)" UserInfo=0x7a67b680 {NSSourceFilePathErrorKey=/Users/User1/Library/Developer/CoreSimulator/Devices/0E591E5B-2E2F-4CCB-9099-95CE1EA3F557/data/Containers/Bundle/Application/E3C8FAE4-703D-46CA-AC37-A1C96A74E6BE/myApp.app/data.xml, NSUserStringVariant=( Copy), NSFilePath=/Users/User1/Library/Developer/CoreSimulator/Devices/0E591E5B-2E2F-4CCB-9099-95CE1EA3F557/data/Containers/Bundle/Application/E3C8FAE4-703D-46CA-AC37-A1C96A74E6BE/myApp.app/data.xml, NSDestinationFilePath=/Users/User1/Library/Developer/CoreSimulator/Devices/0E591E5B-2E2F-4CCB-9099-95CE1EA3F557/data/Containers/Data/Application/09F690B3-BDD8-4482-ADDE-E33F30D4B873/Documentsdata.xml, NSUnderlyingError=0x7a67dd80 "The operation couldn’t be completed. File exists"}

请帮助！

来源

2015-09-04 AJ152

实施NSFileManagerDelegate和委托方法

optional func fileManager(_ fileManager: NSFileManager, 
    shouldProceedAfterError error: NSError, 
     copyingItemAtURL srcURL: NSURL, 
        toURL dstURL: NSURL) -> Bool

，并返回true

另外，您可以使用

func replaceItemAtURL(_ originalItemURL: NSURL, 
       withItemAtURL newItemURL: NSURL, 
      backupItemName backupItemName: String?, 
         options options: NSFileManagerItemReplacementOptions, 
      resultingItemURL resultingURL: AutoreleasingUnsafeMutablePointer<NSURL?>) throws

来源

2015-09-04 18:08:31 vadian

谢谢@vadian，第二个选项帮助！ – AJ152

当在iOS模拟器中测试我的应用程序时，复制文件过程正常，但是当我在我的设备iPhone上测试时，出现错误： '错误域= NSCocoaErrorDomain代码= 513“操作无法完成。（Cocoa error 513.）“UserInfo = 0x17e8af80 {NSUnderlyingError = 0x17e89210”操作无法完成，操作不允许“，NSFilePath =/private/var/mobile/Containers/Bundle/Application/A44E5FF5-F52A-45E7-A803 -DB6A19F1DB82/myApp.app/data.xml' – AJ152

这是因为我在使用Xcode 7 side load的iPhone上运行我的应用程序？ @vadian – AJ152

NSFileManager fileExistsAtPath无法覆盖Swift 2中的现有文件

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