Sort array of NSDictionaries by a value inside one of the keys

This question already has an answer here:

How do I sort an NSMutableArray with custom objects in it? 25 answers

Sorting NSArray of dictionaries by value of a key in the dictionaries 10 answers

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使用以下内容;

NSArray *sortedArray;
sortedArray = [unsortedArray sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *first, NSDictionary *second) {
    // Calculate distances for each dictionary from the device
    // ...
    return [firstDistance compare:secondDistance];
}];

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Unfortunately you can't sort NSDictionary objects. You should create NSMutableArray and sort it instead.

See this - Collections Programming Topics - Sorting Arrays

Update: To sort array of dictionaries you can use for example this method of NSArray:

sortedArray = [someArray sortedArrayUsingFunction:compareElements context:NULL];

The compareElements function example:

NSInteger compareElements (id num1, id num2, void *context)
{
    int v1 = [[num1 objectForKey:@"distance"] integerValue];
    int v2 = [[num2 objectForKey:@"distance"] integerValue];
    if (v1 < v2)
        return NSOrderedAscending;
    else if (v1 > v2)
        return NSOrderedDescending;
    else
        return NSOrderedSame;
}

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