Insertion Sort Objective-C

InsertionSort.m

//Insertion Sort of an array of integers
//**************************************
NSMutableArray* insertionSort(NSMutableArray* unsortedArray){
    if(!unsortedArray) return nil;
    if(unsortedArray.count<2) return unsortedArray;
    
    for (int j=1; j<unsortedArray.count; j++) {
        int i = j;
        while(i>0 && [[unsortedArray objectAtIndex:(i-1)] intValue] > [[unsortedArray objectAtIndex:i] intValue])
        {
            [unsortedArray exchangeObjectAtIndex:i withObjectAtIndex:(i-1)];
            i--;
        }
    }
    return unsortedArray;
}