Sorting Array

    [favoriteArraysortUsingDescriptors:[NSArray arrayWithObject:[[NSSortDescriptor alloc]initWithKey:nilascending:YES]]];

File Appening

 //append text to file (you'll probably want to add a newline every write)

      NSFileHandle *file = [NSFileHandle fileHandleForUpdatingAtPath:filePath];

      [file seekToEndOfFile];

      [file writeData:[content dataUsingEncoding:NSUTF8StringEncoding]];

      [file closeFile];