[indexSet enumerateRangesUsingBlock:^(NSRange range, BOOL * _Nonnull stop) {
         NSLog(@"location is %d, %ld", range.location, range.length);
}];

[indexSet enumerateRangesUsingBlock:^(NSRange range, BOOL * _Nonnull stop) {

     array[i] =range.location;
     ++i;
     array[i] =range.length;
     ++i;

     NSLog(@"location is %d, %ld", range.location, range.length);
}];