Swift 定时器检查 TouchesEnded

Question

很抱歉让我感到尴尬，但请问我能否获得有关如何执行此操作的完整代码:

我希望在我的游戏中每发射一颗子弹后延迟 1 秒，以防止子弹垃圾邮件。如果可能的话，不要像我在 touchesEnded 中那样为子弹生成创建单独的函数。所以点击，射击，等待。点击，射击，等待。在等待的过程中，如果屏幕被点击，什么也不会发生。谢谢，对不起，我是初学者

guard let touch = touches.first else {
        return
    }
    let touchLocation = touch.location(in: self)

    //Set up initial location of bullet and properties
    let bullet = SKSpriteNode(imageNamed: "bullet")
    bullet.name = "Bullet"
    bullet.position = player.position
    bullet.setScale(0.75)
    bullet.zPosition = 1
    bullet.physicsBody = SKPhysicsBody(circleOfRadius: bullet.size.width/2)
    bullet.physicsBody?.isDynamic = true
    bullet.physicsBody?.categoryBitMask = PhysicsCategory.Projectile
    bullet.physicsBody?.contactTestBitMask = PhysicsCategory.Monster
    bullet.physicsBody?.collisionBitMask = PhysicsCategory.None
    bullet.physicsBody?.usesPreciseCollisionDetection = true



    //Determine offset of location to bullet
    let offset = touchLocation - bullet.position

    //Stops Bullet from shooting backwards
    if (offset.y < 0) { return }

    addChild(bullet)

    //Get the direction of where to shoot
    let direction = offset.normalized()

    //Make it shoot far enough to be guaranteed off screen
    let shootAmount = direction * 1000

    //Add the shoot amount to the current position
    let realDest = shootAmount + bullet.position

    //Create the actions

    if currentGameState == gameState.inGame {
    let actionMove = SKAction.move(to: realDest, duration: 1.2)
    let actionMoveDone = SKAction.removeFromParent()
    bullet.run(SKAction.sequence([actionMove, actionMoveDone]))
    }

}

Answer 1

试试这个:

var fired = false

// Other code...

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    guard let touch = touches.first else {
        return
    }
    let touchLocation = touch.location(in: self)

    if fired == false {

        fired = true

        //Set up initial location of bullet and properties
        let bullet = SKSpriteNode(imageNamed: "bullet")
        bullet.name = "Bullet"
        bullet.position = player.position
        bullet.setScale(0.75)
        bullet.zPosition = 1
        bullet.physicsBody = SKPhysicsBody(circleOfRadius: bullet.size.width/2)
        bullet.physicsBody?.isDynamic = true
        bullet.physicsBody?.categoryBitMask = PhysicsCategory.Projectile
        bullet.physicsBody?.contactTestBitMask = PhysicsCategory.Monster
        bullet.physicsBody?.collisionBitMask = PhysicsCategory.None
        bullet.physicsBody?.usesPreciseCollisionDetection = true



        //Determine offset of location to bullet
        let offset = touchLocation - bullet.position

        //Stops Bullet from shooting backwards
        if (offset.y < 0) { return }

        addChild(bullet)

        //Get the direction of where to shoot
        let direction = offset.normalized()

        //Make it shoot far enough to be guaranteed off screen
        let shootAmount = direction * 1000

        //Add the shoot amount to the current position
        let realDest = shootAmount + bullet.position

        //Create the actions

        if currentGameState == gameState.inGame {
            let actionMove = SKAction.move(to: realDest, duration: 1.2)
            let actionMoveDone = SKAction.removeFromParent()
            bullet.run(SKAction.sequence([actionMove, actionMoveDone]))

        }

        run(SKAction.wait(forDuration: 1), completion: { fired = false })

    }
}

这意味着每次发射子弹时，都会出现 1 秒的计时器，这会阻止子弹代码运行，直到时间结束。此时， bool 值切换回 false，允许再次运行代码。