Swift 3 子弹发射延迟

Question

在我的游戏中，您点击屏幕上的任意位置，子弹就会朝那个方向飞去。唯一的问题是您可以尽可能快地拍摄。有什么办法可以在每次拍摄后增加延迟。所以我想开枪，等1秒再开枪。这是我在 touchesEnded 中的代码:

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

    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: 1.0)
    let actionMoveDone = SKAction.removeFromParent()
    bullet.run(SKAction.sequence([actionMove, actionMoveDone]))
    }

}

感谢您的帮助。

Answer 1

这是一种更简单的方法，基于日期的使用:

var time = Date()

func shoot(after timeInterval: Double) {
    guard Date() - timeInterval > time else {
        print("WAIT")
        return
    }
    print("SHOOT")
    time = Date() // reset the timer
}

// CALL THIS INSIDE touchesEnded
shoot(after: 1)

只需根据您的需要进行修改:]