Swift Sprite Kit易于创建项目符号

如何轻松创建像图片一样的项目符号

1. 创建SkSpriteNode

var bullet = SKSpriteNode() 

2.将SKSpriteNode添加到视图

 func bulletFire(){ 
 bullet = SKSpriteNode(color: UIColor.green, size: CGSize(width: 5, height: 50)) 
 bullet.name = "fireBullet" 
 addChild(bullet) 
 bullet.zPosition = 2 
 let move = SKAction.moveTo(y: self.frame.height, duration: 1) 
 bullet.run(move) 
 } 
 

3.在节点离开视图后设置删除节点

 self.enumerateChildNodes(withName: "fireBullet") { (node : SKNode, nil) in 
 if node.position.y > self.frame.height / 2 { 
 node.removeFromParent() 
 } 
 } 
 

4.将节点添加到TouchesBegin

 override func touchesBegan(_ touches: Set, with event: UIEvent?) { 
 for t in touches { 
 self.touchDown(atPoint: t.location(in: self)) 
 var pos : CGPoint = t.location(in: self) 
 bulletFire() 
 } 
 }