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

Question

What I want to do seems pretty simple, but I can\'t find any answers on the web. I have an NSMutableArray of objects, and let\'s say they are \'Person\' objects

Answer 1

iOS 4 blocks will save you :)

featuresArray = [[unsortedFeaturesArray sortedArrayUsingComparator: ^(id a, id b)  
{
    DMSeatFeature *first = ( DMSeatFeature* ) a;
    DMSeatFeature *second = ( DMSeatFeature* ) b;

    if ( first.quality == second.quality )
        return NSOrderedSame;
    else
    {
        if ( eSeatQualityGreen  == m_seatQuality || eSeatQualityYellowGreen == m_seatQuality || eSeatQualityDefault  == m_seatQuality )
        {
            if ( first.quality < second.quality )
                return NSOrderedAscending;
            else
                return NSOrderedDescending;
        }
        else // eSeatQualityRed || eSeatQualityYellow
        {
            if ( first.quality > second.quality )
                return NSOrderedAscending;
            else
                return NSOrderedDescending;
        } 
    }
}] retain];

http://sokol8.blogspot.com/2011/04/sorting-nsarray-with-blocks.html a bit of description