アプリがクラッシュしてしまう。その２

Question

この質問の続きです。(https://teratail.com/questions/71493)

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?){
     
        for touch in touches{
            _ = 0.01
            let newPosition = touch.location(in: self)
            let oldPosition = touch.previousLocation(in: self)
            let xTranslation = newPosition.x - oldPosition.x
        
            if centerSelectWorldBTN!.frame.midX > size.width/2 {
                if (leftSelectWorldBTN != nil) {
                    let actualTranslation = leftSelectWorldBTN!.frame.midX + xTranslation > leftGuide ? xTranslation : leftGuide - leftSelectWorldBTN!.frame.midX
                    movePlayerByX(player: leftSelectWorldBTN!, x: actualTranslation)
                }
            } else {
                if (rightSelectWorldBTN != nil) {
                    let actualTranslation = rightSelectWorldBTN!.frame.midX + xTranslation < rightGuide ? xTranslation : rightGuide - rightSelectWorldBTN!.frame.midX
                    movePlayerByX(player: rightSelectWorldBTN!, x: actualTranslation)
                }
            }
            movePlayerByX(player: centerSelectWorldBTN!, x: xTranslation)
        }
    }
    
    
    
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        
        let duration = 0.25
        
        switch zoneOfCenterSelectWorldBTN() {
            
        case .Left:
            if (rightSelectWorldBTN != nil) {
                movePlayerToX(player: centerSelectWorldBTN!, x: leftGuide, duration: duration)
                if (leftSelectWorldBTN != nil) {
                    movePlayerToX(player: leftSelectWorldBTN!, x: leftGuide, duration: duration)
                }
                if (rightSelectWorldBTN != nil) {
                    movePlayerToX(player: rightSelectWorldBTN!, x: size.width/2, duration: duration)
                }
                
                centerSelectWorldBTN = rightSelectWorldBTN
                setLeftAndRightSelectWorldBTN()
            } else {
                movePlayerToX(player: centerSelectWorldBTN!, x: size.width/2, duration: duration)
            }
            
        case .Right:
            if (leftSelectWorldBTN != nil) {
                movePlayerToX(player: centerSelectWorldBTN!, x: rightGuide, duration: duration)
                if (rightSelectWorldBTN != nil) {
                    movePlayerToX(player: rightSelectWorldBTN!, x: rightGuide, duration: duration)
                }
                if (leftSelectWorldBTN != nil) {
                    movePlayerToX(player: leftSelectWorldBTN!, x: size.width/2, duration: duration)
                }
                
                centerSelectWorldBTN = leftSelectWorldBTN
                setLeftAndRightSelectWorldBTN()
            } else {
                movePlayerToX(player: centerSelectWorldBTN!, x: size.width/2, duration: duration)
            }
            
        case .Center:
            movePlayerToX(player: centerSelectWorldBTN!, x: size.width/2, duration: duration)
            if (leftSelectWorldBTN != nil) {
                movePlayerToX(player: leftSelectWorldBTN!, x: leftGuide, duration: duration)
            }
            if (rightSelectWorldBTN != nil) {
                movePlayerToX(player: rightSelectWorldBTN!, x: rightGuide, duration: duration)
            }
        }

        calculateZIndexesForPlayers()
    }
}

Answer 1

このように置き換えることでクラッシュしなくなりました。

if backhomeBTN.contains(location){
                self.removeAllChildren()
                self.removeAllActions()
                createHome()
                
            }

でも何が原因なのかわからない、リムーブしないと重くなるということかな？
これを見た人教えてください。