Iglistkit: Question about resultForBatchUpdates in IGListIndexSetResult.m

[D-Wang]

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General information

I'm trying to implement the diff part in Swift. I found this code in IGListIndexSetResult.m resultForBatchUpdates:

// convert all update+move to delete+insert
 const NSUInteger moveCount = moves.count;
    for (NSInteger i = moveCount - 1; i >= 0; i--) {
        IGListMoveIndex *move = moves[i];
        if ([filteredUpdates containsIndex:move.from]) {
            [filteredMoves removeObjectAtIndex:i];
            [filteredUpdates removeIndex:move.from];
            [deletes addIndex:move.from];
            [inserts addIndex:move.to];
        }
    }

In line 5, filteredMoves removes object at index i, since filteredMoves will change when enumerating, this cannot guarantee the specific IGListMoveIndex object will be removed. Was that on purpose?

[D-Wang]

I figured this out , the enumeration was reversed.