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Move a Hotbar Slot

Blueprint 
Move Hotbar Slot
   From Index = A
   To Index   = B
C++ 
HotbarComponent->MoveHotbarSlot(FromIndex, ToIndex);

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Swap with Inventory (C++ Example)

// Take one item from inventory
FItemInstance InvItem = InventoryComponent->TakeItemAt(InventorySlotIndex, 1);

// Get current hotbar item
FItemInstance HotbarItem = HotbarComponent->GetItemAtIndex(HotbarSlotIndex);

// Assign inventory item to hotbar
HotbarComponent->AssignItemToSlot(InvItem, HotbarSlotIndex);

// Put old hotbar item back in inventory
if (!HotbarItem.IsEmpty())
{
    InventoryComponent->AddItemInstance(HotbarItem);
}
Blueprint does the same thing using:
  • Take Item At (InventoryComponent)
  • Get Item At Index (HotbarComponent)
  • Assign Item To Slot
  • Add Item Instance