title: writeToFile not working with NSDictionary
body: <p>I looked around other similar questions about this but nothing really worked. </p>
  
  <p>I managed to write only one pair (object / key) of the dictionary (e.g.: setObject:itemProperties[0] forKey[0]) on my Plist. But I would like all the objets and keys to be added. I didn't managed so far (return the error). Any help?</p>
  
  <pre><code> // Path to Documents Folder
  
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = [paths objectAtIndex:0];
  NSString *path = [documentsDirectory stringByAppendingPathComponent:@"items.plist"];
  NSFileManager *fileManager = [NSFileManager defaultManager];
  
  if (![fileManager fileExistsAtPath: path])
  {
      path = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat: @"items.plist"] ];
  }
  
  NSMutableDictionary *items;
  
  if ([fileManager fileExistsAtPath: path])
  {
      items = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
  }
  else
  {
      // If the file doesn’t exist, create an empty dictionary
      items = [[NSMutableDictionary alloc] initWithCapacity:5];
  }
  
  // array of the item properties
  NSArray *itemProperties = @[myItem.itemTitle, myItem.itemImage, myItem.itemPositionX, myItem.itemPositionY, myItem.itemHeight, myItem.itemWidth];
  
  // Set the key values for each field    
  NSArray *keys = @[@"Title", @"Image", @"PositionX", @"PositionY", @"Height", @"Width"];
  
  
  [items setObject:itemProperties forKey:keys];
  
  //Save dictionnary to Plist
  [items writeToFile: path atomically:YES];
  
  if (![items writeToFile:path atomically:YES]) {
      NSLog(@"Error with creating Plist");
  }
  </code></pre>