Hello, I really appreciate this book. It is very clear and helpful.
However I am really puzzled with the Learning features that we are building in Chap. 12.
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LearningStore initializer - why are you using the so complicated getNextCard() and getLastCard() helper methods within the init to set the card parameter?
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As we are incrementing the LearningStore score (which is @Published) when the CardView is dragged on the left, the LearnView view is rebuilt. Thus we call the getCardView(for card: FlashCard) for each remaining FlashCard. In this example there are 8 of them when we start. As we are never changing the LearningStore deck, there are always 8 FlashCard within this deck even after dragging CardView. So I don’t understand that we get the expected result (the stack of CardView is decreasing) after a left drag: the score is increased and therefore we rebuild LearnView and thus we are calling again the getCardView(for card: FlashCard) for every FlashCard in the deck (always 8). We should get again all 8 CardView on the ZStack.
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I do not get the fact that we are using @ObservedObject private var deck: FlashDeck within DeckView. We are never modifying this deck. When I change the declaration to private var deck: FlashDeck, it just works fine
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I do not understand the getCarView(for card: FlashCard) → CardView helper function.
private func getCardView(for card: FlashCard) → CardView {
let activeCards = deck.cards.filter { $0.isActive == true }
if let lastCard = activeCards.last {
if lastCard == card {
return createCardView(for: card)
}
}let view = createCardView(for: card)
return view
}
What is the point of finding the lastCard as we are anyway creating the view the same way if it is the last card or not. Just having the 2 last lines of code within this function just works fine. -
FlashCard isActive property. What is the point of this property? We never change it, it is always true and we are testing it at least twice.
I thank you very much to explain to me the above.