Sorting of array of dictionaries by using key of dictionary

Question

    {
        "restaurant name" : "str1",
         "distance": 19.4
    }
    {
        "restaurant name" : "str2",
         "distance": 2.1
    {
        "restaurant name" : "str3",
         "distance":19.3
    }
    {
        "restaurant name" : "str4",
         "distance": 2.1
    }

Above is my array of dictionary values restaurant name and key. I have used following code but it is not sorting properly. It is showing sequence 19.3 ,19.4, 2.1, 2.1. I think it is comparing only first digit

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:kRestaurantListDistance ascending:YES selector:@selector(compare:)];
[restaurantList sortUsingDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];

Please tell me proper code to sort out array in ascending order.

Pipiks · Accepted Answer · 2015-12-16 13:10:22Z

1

You can maybe try this :

array = [[NSMutableArray alloc] initWithArray:[array sortedArrayUsingComparator:^(id obj1, id obj2) {
    float distance1 = [[obj1 objectForKey:@"distance"] floatValue];
    float distance2 = [[obj2 objectForKey:@"distance"] floatValue];

    if (distance1 < distance2) {
        return (NSComparisonResult)NSOrderedDescending;
    } else if (distance1 > distance2) {
        return (NSComparisonResult)NSOrderedAscending;
    } else {
        return (NSComparisonResult)NSOrderedSame;
    }
}]];

answered Dec 16, 2015 at 13:10

Pipiks

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Stephen Darlington · Accepted Answer · 2015-12-16 12:23:04Z

0

If it's sorting by the first digit, that means that your numbers are, in fact, just strings.

Two possible approaches:

Before you sort then, convert them to numbers (it's in a dictionary, so they'll have to be NSNumbers rather than simple floats)
Create your own compare method or block (I typically prefer to use initWithKey:ascending:comparator:)

Which approach you use depends on what you do with the dictionary afterwards. If you need numbers again later, 1 is probably best; otherwise 2.

answered Dec 16, 2015 at 12:23

Stephen Darlington

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Comments

Hardip Kalola · Accepted Answer · 2015-12-17 04:40:52Z

0

You can maybe try this. it will work :

arrWholeArrImg=[NSMutableArray sortArray:_arrWholeArrImg string:@"CategoryName"];

    +(NSMutableArray *)sortArray:(NSMutableArray *)arr  string:(NSString *)key {
   NSSortDescriptor *sortDescriptor;
   sortDescriptor = [[NSSortDescriptor alloc] initWithKey:key
                                                       ascending:YES];
   NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
   NSArray  *sortedArray = [arr sortedArrayUsingDescriptors:sortDescriptors];
                    arr = [sortedArray mutableCopy];
                    return arr;
    }

answered Dec 17, 2015 at 4:40

Hardip Kalola

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