如何在水平方向来回移动角色

• Z时代
• 2024-01-10
• 分类：问答

当前试图让怪物角色横向来回移动。我刚刚开始学习上周的时候对Swift非常陌生，而且还没有完全掌握OOP。那么如何在调用addEnemy函数时正确调用enemyStaysWithinPlayableArea函数。继承人我到目前为止：如何在水平方向来回移动角色

import SpriteKit 
class GameScene: SKScene { 
    var monster = SKSpriteNode() 
    var monsterMove = SKAction() 
    var background = SKSpriteNode() 
    var gameArea: CGRect 
// MARK: - Set area where user can play 
    override init(size: CGSize) { 
     // iphones screens have an aspect ratio of 16:9 
     let maxAspectRatio: CGFloat = 16.0/9.0 
     let playableWidth = size.height/maxAspectRatio 
     let margin = (size.width - playableWidth)/2 
     gameArea = CGRect(x: margin, y: 0, width: playableWidth, height: size.height) 
     super.init(size: size) 
} 
required init?(coder aDecoder: NSCoder) { 
    fatalError("init(coder:) has not been implemented") 
} 
override func didMove(to view: SKView) { 
    // I want to run addEnemy() while it checks for enemyStayWithinPlayableArea() 
    // run(SKAction.repeatForever(...)) ??? 
    enemyStayWithinPlayableArea() 
    // MARK: - Setting the background 
    background = SKSpriteNode(imageNamed: "background") 
    background.size = self.size 
    // Set background at center of screen 
    background.position = CGPoint(x:self.size.width/2 ,y:self.size.height/2) 
    // Layering so everything in the game will be in front of the background 
    background.zPosition = 0 
    self.addChild(background) 
} 
func addEnemy() { 
    // MARK: - Set up enemy and its movements 
    monster = SKSpriteNode(imageNamed: "monster") 
    monster.zPosition = 5 
    // this is where the enemy starts 
    monster.position = CGPoint(x: 0, y: 300) 
    self.addChild(monster) 
    // I want it to move to the end of the screen within 1 sec 
    monsterMove = SKAction.moveTo(x: gameArea.maxX, duration: 1.0) 
    monster.run(monsterMove) 
} 
func enemyStayWithinPlayableArea(){ 
    addEnemy() 
    // when the monster reaches the right most corner of the screen 
    // turn it back around and make it go the other way 
    if monster.position.x == gameArea.maxX{ 
     monsterMove = SKAction.moveTo(x: gameArea.minX, duration: 1.0) 
     monster.run(monsterMove) 
    } 
    // when the monster reaches the left most corner of the screen 
    // same idea as above 
    if monster.position.x == gameArea.minX{ 
     monsterMove = SKAction.moveTo(x: gameArea.maxX, duration: 1.0) 
     monster.run(monsterMove) 
    } 
} 
} 

到目前为止，敌人在屏幕上移动到屏幕的右边缘，以便部分完美地工作。我只需要帮助确保它继续循环（也许使用SKAction.repeatForever方法，但不知道如何）。

回答：

let moveLeft = SKAction.moveTo(CGPoint(x: xpos, y: ypos), duration: duration) 
let moveRight = SKAction.moveTo(CGPoint(x: xpos, y: ypos), duration: duration) 
sprite.runAction(SKAction.repeatActionForever(SKAction.sequence([moveLeft, moveRight]))) 

sprite.removeAllActions() 

回答：

func moveToMin(){ 
    monsterMove = SKAction.moveTo(x: gameArea.minX, duration: 1.0) 
    monster.run(monsterMove, completion: { 
     moveToMax() 
    }) 
} 

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