ios - applyImpulse 在接触节点时不起作用

Question

我在屏幕上有一个圆圈，它会慢慢变大(顺便说一下，Balloon 类是 SKShapeNode 的一种)。在 touchesBegan 中，我单击圆圈并打印出我触摸了它，但是没有施加任何冲动。我怎样才能找到问题所在？我是 SpriteKit 的新手。

import SpriteKit
import GameplayKit

class GameScene: SKScene {

var radius = 40.0

var balloon : Balloon? = nil

override func didMove(to view: SKView) {

    balloon = Balloon(radius: radius, position: CGPoint(x: frame.midX, y: frame.minY + 250))
    balloon?.name = "balloon"

    let physicsBody = SKPhysicsBody(circleOfRadius: CGFloat(radius))
    physicsBody.affectedByGravity = false
    balloon?.physicsBody = physicsBody
    balloon?.physicsBody?.isDynamic = true

    let borderBody = SKPhysicsBody(edgeLoopFrom: self.frame)
    borderBody.friction = 0
    self.physicsBody = borderBody
    physicsWorld.gravity = CGVector(dx: 0.0, dy: 0.0)

    self.addChild(balloon!)

}



override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in touches {
        let location = touch.location(in: self)
        let node : SKNode = self.atPoint(location)
        if node.name == "balloon" {
            print("touching balloon.")
            balloon?.physicsBody?.applyImpulse(CGVector(dx: 10.0, dy: 10.0), at: location)
        }
    }

}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

}

override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {

}


 override func update(_ currentTime: TimeInterval) {
    // Called before each frame is rendered
    radius += 0.05
    self.balloon?.radius = radius

    let physicsBody = SKPhysicsBody(circleOfRadius: CGFloat(radius))
    physicsBody.affectedByGravity = false
    balloon?.physicsBody = physicsBody
    balloon?.physicsBody?.isDynamic = true

  }
}

Answer 1

每次更新你都在创建一个新的主体。如果您想给气球充气，请使用秤:

var scale = 1.0
override func update(_ currentTime: TimeInterval) {
    // Called before each frame is rendered
    scale += 0.05
    self.balloon?.setScale(scale)
}

然后你的物理 body 将能够将脉冲应用到它，因为你不会在每次更新时都创建一个新的 body 。