title: how to write in append mode for text file
body: <p>My application navigation based.  UItextView  for notes UIViewController. I am writing data  for text to file. Now i need to write in append mode , the below code i am trying but every time is writing to two time with same text data, and not appending if next text data  to file.</p>
  
  <pre><code>- (void)saveText:(id)sender
  {
      [self.textview resignFirstResponder];
      NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
      NSString *documentsDirectory = [documentPaths objectAtIndex:0];
      NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.txt"];
      NSString *savedString = textview.text;
      [savedString writeToFile:documentTXTPath atomically:YES];
  
  
      NSFileHandle *myHandle = [NSFileHandle fileHandleForUpdatingAtPath:documentTXTPath ];
      [myHandle seekToEndOfFile];
      [myHandle writeData:  [savedString dataUsingEncoding:NSUTF8StringEncoding]];
      [myHandle closeFile];
  
  }
  </code></pre>