[ios] How do I sort an NSMutableArray with custom objects in it?

I just done multi level sorting based on custom requirement.

//sort the values

    [arrItem sortUsingComparator:^NSComparisonResult (id a, id b){

    ItemDetail * itemA = (ItemDetail*)a;
    ItemDetail* itemB =(ItemDetail*)b;

    //item price are same
    if (itemA.m_price.m_selling== itemB.m_price.m_selling) {

        NSComparisonResult result=  [itemA.m_itemName compare:itemB.m_itemName];

        //if item names are same, then monogramminginfo has to come before the non monograme item
        if (result==NSOrderedSame) {

            if (itemA.m_monogrammingInfo) {
                return NSOrderedAscending;
            }else{
                return NSOrderedDescending;
            }
        }
        return result;
    }

    //asscending order
    return itemA.m_price.m_selling > itemB.m_price.m_selling;
}];

https://sites.google.com/site/greateindiaclub/mobil-apps/ios/multilevelsortinginiosobjectivec

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