Swift SpriteKit红心未附加到最后一个位置

Question

我正在玩一款SpriteKit游戏，玩家一开始有三颗心，当他被击中时，他会失去一颗心，如果他收集了一颗心，他可以得到一颗心。我得到了所有的工作，但当他找回心脏时，它们出现在最后一颗心脏周围。

// 1: here is the function for when he loses a heart

func takeDamage() {
        if invulnerable || damaged { return }
        lives -= 1
        
        let lastElementIndex = heartsArray.count - 1
        print(heartsArray.count)
        if heartsArray.indices.contains(lastElementIndex - 1) {
            let lastHeart = heartsArray[lastElementIndex]
            lastHeart.removeFromParent()
            print("removed heart")
            heartsArray.remove(at: lastElementIndex)
        }

// 2: here is the original filling of hearts

func fillHearts(count: Int) {
           for index in 1...count {
               let heartTexture = SKTexture(imageNamed: "heart")
               let heart = SKSpriteNode(imageNamed: "heart")
               heart.size = CGSize(width: heartTexture.size().width / 4, height: heartTexture.size().height / 4)
               let xPosition = heart.size.width * CGFloat(index - 1)
               heart.position = CGPoint(x: xPosition, y: 0)
               heartsArray.append(heart)
               heartContainer.addChild(heart)
               
               
           }

// 3: and here is the adding + 1 heart when he gets a heart item


if refillHeart == true {
            for index in 0..<1 {
                   let heartTexture = SKTexture(imageNamed: "heart")
                   let heart = SKSpriteNode(imageNamed: "heart")
                   heart.size = CGSize(width: heartTexture.size().width / 4, height: heartTexture.size().height / 4)
                   let xPosition = heart.size.width * CGFloat(index - 1)
                   heart.position = CGPoint(x: xPosition, y: 0)
                   heartsArray.append(heart)
                   heartContainer.addChild(heart)
                print(heartsArray)
                   refillHeart = false
            }
        }

Answer 1

这是因为在for循环中，index始终为0，因此xPosition始终为0。

if refillHeart == true 
{
    let heartTexture = SKTexture(imageNamed: "heart")
    let heart = SKSpriteNode(imageNamed: "heart")
    heart.size = CGSize(width: heartTexture.size().width / 4, height: heartTexture.size().height / 4)

    // this was the problem
    // let xPosition = heart.size.width * CGFloat(index - 1) 
    // because of your for loop, the index was always 0 


    // get number of displayed hearts
    let heartsNumber: CGFloat = CGFloat(heartsArray.count)
    let xPosition = heart.size.width * heartsNumber

    heart.position = CGPoint(x: xPosition, y: 0)
    heartsArray.append(heart)
    heartContainer.addChild(heart)
    print(heartsArray)
    refillHeart = false
}