打开文本文件困难

Question

我正在尝试合并一个文件浏览器，允许用户选择一个文本文件，并将文件的内容显示在NSTextView中。我有文件浏览器工作和文本框工作，但我似乎无法打开该文件，并从它（每行1）生成至少一个或最好一系列的字符串。

let FileWindow : NSOpenPanel = NSOpenPanel() 
    FileWindow.prompt = "Open File" 
    FileWindow.title = "Select a File" 
    FileWindow.allowedFileTypes = ["txt"] 
    FileWindow.canChooseDirectories = false 
    FileWindow.allowsMultipleSelection = false 
    FileWindow.runModal() 
    var selectedfile = FileWindow.URL 
    var output = selectedfile?.absoluteString 
    var index: String.Index = advance(output!.startIndex, 7) 
    FileLabel.stringValue = output!.substringFromIndex(index) 

if (selectedfile != nil) { 
var data: NSData = NSFileManager.defaultManager().contentsAtPath(output!.substringFromIndex(index))! 
     var txt: NSString = NSString(data: data, encoding: NSUTF8StringEncoding)! 
     self.FileDisplayView.textStorage?.mutableString.appendString(txt) 
     self.FileDisplayView.needsDisplay = true 
    } 

任何帮助，将不胜感激！

Answer 1

更新：的Xcode 7.1•斯威夫特2.1

你应该用String（contentsOfFile :)或字符串（contentsOfURL :)

创建这个类来处理打开文本文件：

public class File { 

    class func open(path: String, encoding: NSStringEncoding = NSUTF8StringEncoding) -> String? { 
     guard NSFileManager().fileExistsAtPath(path) else { return nil } 
     do { 
      return try String(contentsOfFile: path, encoding: encoding) 
     } catch let error as NSError { 
      print(error.localizedDescription) 
      return nil 
     } 
    } 
    class func save(path: String, fileContent: String, encoding: NSStringEncoding = NSUTF8StringEncoding) -> Bool { 
     do { 
      try fileContent.writeToFile(path, atomically: true, encoding: encoding) 
      return true 
     } catch let error as NSError { 
      print(error.localizedDescription) 
      return false 
     } 
    } 
} 

class Url { 
    class func read(urL: NSURL, encoding: NSStringEncoding = NSUTF8StringEncoding) -> String? { 
     do { 
      return try String(contentsOfURL: urL, encoding: encoding) 
     } catch let error as NSError { 
      print(error.localizedDescription) 
      return nil 
     } 
    } 
    class func write(urL: NSURL, fileContent: String, encoding: NSStringEncoding = NSUTF8StringEncoding) -> Bool { 
     do { 
      try fileContent.writeToURL(urL, atomically: true, encoding: encoding) 
      return true 
     } catch let error as NSError { 
      print(error.localizedDescription) 
      return false 
     } 
    } 

} 

的用法就是这样的：

if let loadedString = File.open("\(NSHomeDirectory())/Desktop/file.txt") { 
    println(loadedString) 
} else { 
    println("error reading file") 
} 

或打开你的网址：

if let loadedString = Url.read(yourUrl) { 
    println(loadedString) 
} else { 
    println("error reading file") 
}