'Objective-C Sort a array with subarrays with key

Have a NSMutable Array that add subarrays with key, i try sort by "distkm", but not sort:

[alldata addObject:@{@"sublista": sublista, @"subdetail": subdetail, @"distkm": distkm }];
NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"distkm" ascending:YES];
alldata = (NSMutableArray *)[alldata sortedArrayUsingDescriptors:@[descriptor]];

But result is same before sort: Result of sort array

Agree some help. THANKS

sorting nsmutablearray

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'Objective-C Sort a array with subarrays with key

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