Quick sort in Objective-C

gistfile1.m

-(void)quickSortArray:(NSMutableArray*)array fromLeftIndex:(NSUInteger)leftIndex toRightIndex:(NSUInteger)rightIndex{
    
    NSUInteger chosenPivot = 0;
    
    if (leftIndex == 0 && rightIndex == 0)
        rightIndex = array.count - 1;

    chosenPivot = leftIndex + ceil((rightIndex - leftIndex) * 0.5);
    
    NSUInteger newPivot  = [self partitionArray:array pivot:chosenPivot left:leftIndex right:rightIndex];
    
    if (newPivot > 0){
    
        if (leftIndex < newPivot-1 && newPivot+1 < rightIndex){
            [self quickSortArray:array fromLeftIndex:leftIndex toRightIndex:newPivot-1]; //recursively sort to the left
            [self quickSortArray:array fromLeftIndex:newPivot+1 toRightIndex:rightIndex]; //recursively sort to the right
        }else{
            NSLog(@"array is sorted %@",array);
        }
    }
}


-(NSUInteger)partitionArray:(NSMutableArray*)array pivot:(NSUInteger)pivotIndex left:(NSUInteger)leftmostIndex right:(NSUInteger)rightmostIndex{
    
    NSNumber* pivotValue = array[pivotIndex];
    NSUInteger storedIndex = leftmostIndex;
    
    /** place the pivot at the rightmost index */
    [self swapFirstIndex:pivotIndex withSecondIndex:rightmostIndex inMutableArray:array];
    
    /* swap the rest at this level*/
    for(int v = leftmostIndex; v < rightmostIndex; v++) {
        
        /** compare value at index to pivot's value. If less than pivot value place at left of the pivot point and move the pivot point right one */

        if([array[v]intValue] < pivotValue.intValue) {
            [self swapFirstIndex:v withSecondIndex:storedIndex inMutableArray:array];
            storedIndex ++;
        }
    }
    
    /** return the pivot to the original position */
    [self swapFirstIndex:rightmostIndex withSecondIndex:storedIndex inMutableArray:array];
    
    /** return repositioned pivot index */
    return storedIndex;
}



-(void)swapFirstIndex:(NSUInteger)firstIndex withSecondIndex:(NSUInteger)secondIndex inMutableArray:(NSMutableArray*)array{
    
    NSNumber* valueAtFirstIndex = array[firstIndex];
    NSNumber* valueAtSecondIndex = array[secondIndex];
    
    [array replaceObjectAtIndex:firstIndex withObject:valueAtSecondIndex];
    [array replaceObjectAtIndex:secondIndex withObject:valueAtFirstIndex];
}

Don't ever use this, the built in NSArray methods are much quicker and much better