Question

我试图做到这一点，以便当我在屏幕上某处触摸时，我的精灵会收到冲动和速度，但我收到了错误代码：

致命错误：在解包可选值时意外发现nil

迫使我放一个＆＃34;！＆＃34;在＆＃34; physicsbody＆＃34;前面，当我这样做时它会崩溃。如果我放一个＆＃34;？＆＃34;冲动和速度刚刚起作用。

func setuprocket() {

    let rocket0 = SKTexture(imageNamed: "0zero.png")
    let rocket1 = SKTexture(imageNamed: "1one.png")
    let rocket2 = SKTexture(imageNamed: "2two.png")
    let rocket3 = SKTexture(imageNamed: "3three.png")
    let rocket4 = SKTexture(imageNamed: "4four.png")
    let rocket5 = SKTexture(imageNamed: "5five")



    let animateRocket = SKAction.sequence([
        SKAction.waitForDuration(0.0, withRange: 1.0),
        SKAction.animateWithTextures([rocket0,
            rocket1,
            rocket2,
            rocket3,
            rocket4,
            rocket5],
            timePerFrame: 0.1)])


    let rocketAnim = SKAction.repeatActionForever(animateRocket)



    let rocket = SKSpriteNode(texture: rocket1)

    rocket.runAction(rocketAnim)
    rocket.setScale(0.5)
    rocket.position = CGPoint(x: self.frame.size.width * 0.35, y: self.frame.size.height * 0.5)

    rocket.physicsBody = SKPhysicsBody(circleOfRadius: rocket.size.height)
    rocket.physicsBody?.dynamic = true
    rocket.physicsBody?.allowsRotation = false
    //bitmask
    rocket.physicsBody?.contactTestBitMask = asteroidCategory
    rocket.physicsBody?.collisionBitMask = asteroidCategory
    self.addChild(rocket)

}

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    /* Called when a touch begins */

    for touch: AnyObject in touches {

        let location = touch.locationInNode(self)


        rocket.physicsBody!.applyImpulse(CGVectorMake(0, 30))
        rocket.physicsBody!.velocity = CGVectorMake(0, 300)
        println(location)

        //if start.containsPoint(location) {
         //   self.physicsWorld.gravity = CGVectorMake(0.0, -3.0)
         //   start.removeFromParent()
       // }

        }

    }
    }

一切都是正确定义的，只是＆＃34;！＆＃34;使比赛崩溃。

Answer 1

我拿出了let rocket = SKSpriteNode(texture: rocket1) 把它放在class下面的最顶端。我确保在项目的最顶端而不是函数内调用它。

无法在没有游戏崩溃的情况下向物理机构添加冲动或速度

1 个答案: