使用NSDictionary在UITableview中对数据进行排序

Question

I have an app that I need to support till the original developer comes back.

Basically it has a method that groups the data into sections of UITableView .

It all works very nicely and shows the Sections by DogLocation .

This is the code I have :

-(void)loadSortedData:(NSString*)breedToLoad fieldToSort:(NSString*)sortField
 {

    self.items = [DbUtilities getDogsByBreed:breedToLoad SortField:sortField];

    NSMutableDictionary * theDictionary = [NSMutableDictionary dictionary];

    for ( Dog * object in self.items )
    {
      NSMutableArray * theMutableArray = [theDictionary objectForKey:object.DogLocation];

      if ( theMutableArray == nil )
      {
        theMutableArray = [NSMutableArray array];
        [theDictionary setObject:theMutableArray forKey:object.DogLocation];
      }

      [theMutableArray addObject:object];

    }

    self.sortedMediaItems = [[theDictionary allKeys]   sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

   /* Save `theDictionary` in an instance variable */
   self.theSource = theDictionary;
   [self.tableView reloadData];

}

I call this method in my ViewDidLoad by using following syntax:

[self loadSortedData:@"Cattle" fieldToSort:@"DogLocation"];

What I am trying to achieve is to be able to call this method by passing a value in the method eg so that I can sort it by other fields and not just the DogLocation eg DogAge,DogPrice .

Could anyone kindly direct me or show me a better way to achieve this instead of writing big if else statement?

Thank you in advance.

Answer 1

您可以尝试使用M13OrderedDictionary，它基于NSObject而不是NSDictionary，但是可以完成所需的工作： https : //github.com/Marxon13/M13OrderedDictionary

Answer 2

As long as sortField is always a valid property of Dog , you can use Key-Value Coding .

for ( Dog * object in self.items )
{
  id key = [object valueForKey:sortField];
  NSMutableArray * theMutableArray = [theDictionary objectForKey:key];

  if ( theMutableArray == nil )
  {
    theMutableArray = [NSMutableArray array];
    [theDictionary setObject:theMutableArray forKey:key];
  }

  [theMutableArray addObject:object];
}