Multithreading 如何在不同的线程上运行函数？

我需要下面的函数在不同的线程上运行。我想我必须使用并发调度队列，但我不知道如何做到这一点，所以我希望得到一些帮助

第一个功能：

func respondToSwipeGesture(sender: UISwipeGestureRecognizer) {

            switch sender.direction {
        case UISwipeGestureRecognizerDirection.Left:
            if self.imageView.tag == 1 {
                println("1 point!")
            } else {
                if self.imageView.tag == 5 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        case UISwipeGestureRecognizerDirection.Down:
            if self.imageView.tag == 2 {
                println("1 point!")
            } else {
                if self.imageView.tag == 8 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        case UISwipeGestureRecognizerDirection.Right:
            if self.imageView.tag == 3 {
                println("1 point!")
            } else {
                if self.imageView.tag == 7 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        case UISwipeGestureRecognizerDirection.Up:
            if self.imageView.tag == 4 {
                println("1 point!")
            } else {
                if self.imageView.tag == 6 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        default:
            break
        }

 @IBAction func handleAttachmentGesture(sender: UIPanGestureRecognizer) {
    let location = sender.locationInView(self.view)
    let boxLocation = sender.locationInView(self.imageView)

    switch sender.state {
    case .Began:
      println("Your touch start position is \(location)")
      println("Start location in image is \(boxLocation)")

      // 1
      animator.removeAllBehaviors()

      // 2
      let centerOffset = UIOffset(horizontal: boxLocation.x - imageView.bounds.midX,
        vertical: boxLocation.y - imageView.bounds.midY)
      attachmentBehavior = UIAttachmentBehavior(item: imageView,
        offsetFromCenter: centerOffset, attachedToAnchor: location)

      // 3
      redSquare.center = attachmentBehavior.anchorPoint
      blueSquare.center = location

      // 4
      animator.addBehavior(attachmentBehavior)

    case .Ended:
      println("Your touch end position is \(location)")
      println("End location in image is \(boxLocation)")

      animator.removeAllBehaviors()

      // 1
      let velocity = sender.velocityInView(view)
      let magnitude = sqrt((velocity.x * velocity.x) + (velocity.y * velocity.y))

      if magnitude > ThrowingThreshold {
        // 2
        let pushBehavior = UIPushBehavior(items: [imageView], mode: .Instantaneous)
        pushBehavior.pushDirection = CGVector(dx: velocity.x / 10, dy: velocity.y / 10)
        pushBehavior.magnitude = magnitude / ThrowingVelocityPadding

        self.pushBehavior = pushBehavior
        animator.addBehavior(pushBehavior)

        // 3
        let angle = Int(arc4random_uniform(20)) - 10

        itemBehavior = UIDynamicItemBehavior(items: [imageView])
        itemBehavior.friction = 0.2
        itemBehavior.allowsRotation = true
        itemBehavior.addAngularVelocity(CGFloat(angle), forItem: imageView)
        animator.addBehavior(itemBehavior)

        // 4
        let timeOffset = Int64(0.4 * Double(NSEC_PER_SEC))
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, timeOffset), dispatch_get_main_queue()) {
            self.resetDemo()
        }
      } else {
        resetDemo()
        }

    default:
        attachmentBehavior.anchorPoint = sender.locationInView(view)
        redSquare.center = attachmentBehavior.anchorPoint
    }

第二个功能：

func respondToSwipeGesture(sender: UISwipeGestureRecognizer) {

            switch sender.direction {
        case UISwipeGestureRecognizerDirection.Left:
            if self.imageView.tag == 1 {
                println("1 point!")
            } else {
                if self.imageView.tag == 5 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        case UISwipeGestureRecognizerDirection.Down:
            if self.imageView.tag == 2 {
                println("1 point!")
            } else {
                if self.imageView.tag == 8 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        case UISwipeGestureRecognizerDirection.Right:
            if self.imageView.tag == 3 {
                println("1 point!")
            } else {
                if self.imageView.tag == 7 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        case UISwipeGestureRecognizerDirection.Up:
            if self.imageView.tag == 4 {
                println("1 point!")
            } else {
                if self.imageView.tag == 6 {
                    println("1 point!")
                } else {
                    println("Game Over!")
                }
            }
        default:
            break
        }

 @IBAction func handleAttachmentGesture(sender: UIPanGestureRecognizer) {
    let location = sender.locationInView(self.view)
    let boxLocation = sender.locationInView(self.imageView)

    switch sender.state {
    case .Began:
      println("Your touch start position is \(location)")
      println("Start location in image is \(boxLocation)")

      // 1
      animator.removeAllBehaviors()

      // 2
      let centerOffset = UIOffset(horizontal: boxLocation.x - imageView.bounds.midX,
        vertical: boxLocation.y - imageView.bounds.midY)
      attachmentBehavior = UIAttachmentBehavior(item: imageView,
        offsetFromCenter: centerOffset, attachedToAnchor: location)

      // 3
      redSquare.center = attachmentBehavior.anchorPoint
      blueSquare.center = location

      // 4
      animator.addBehavior(attachmentBehavior)

    case .Ended:
      println("Your touch end position is \(location)")
      println("End location in image is \(boxLocation)")

      animator.removeAllBehaviors()

      // 1
      let velocity = sender.velocityInView(view)
      let magnitude = sqrt((velocity.x * velocity.x) + (velocity.y * velocity.y))

      if magnitude > ThrowingThreshold {
        // 2
        let pushBehavior = UIPushBehavior(items: [imageView], mode: .Instantaneous)
        pushBehavior.pushDirection = CGVector(dx: velocity.x / 10, dy: velocity.y / 10)
        pushBehavior.magnitude = magnitude / ThrowingVelocityPadding

        self.pushBehavior = pushBehavior
        animator.addBehavior(pushBehavior)

        // 3
        let angle = Int(arc4random_uniform(20)) - 10

        itemBehavior = UIDynamicItemBehavior(items: [imageView])
        itemBehavior.friction = 0.2
        itemBehavior.allowsRotation = true
        itemBehavior.addAngularVelocity(CGFloat(angle), forItem: imageView)
        animator.addBehavior(itemBehavior)

        // 4
        let timeOffset = Int64(0.4 * Double(NSEC_PER_SEC))
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, timeOffset), dispatch_get_main_queue()) {
            self.resetDemo()
        }
      } else {
        resetDemo()
        }

    default:
        attachmentBehavior.anchorPoint = sender.locationInView(view)
        redSquare.center = attachmentBehavior.anchorPoint
    }

---

不确定您正在尝试做什么（尚未阅读全部代码）。但是，如果您确定需要在不同的队列上运行，下面是一个可能会帮助您的快速示例：

let aCustomQueue = dispatch_queue_create("aCustomQueueLabel", DISPATCH_QUEUE_CONCURRENT)
let anotherCustomQueue = dispatch_queue_create("anotherCustomQueueLabel", DISPATCH_QUEUE_CONCURRENT)

dispatch_async(aCustomQueue) {

    for _ in 0...1000 {
        NSLog("Hello") // println("Hello") will print char by char
    }
}


dispatch_async(anotherCustomQueue) {

    for _ in 0...1000 {
        NSLog("World") // println("World") will print char by char
    }

}

否则，您可能需要查看：

• 中央总调度（GCD）参考：
• Ray Wenderlich GCD：

---

这两个功能都以用户界面为中心（它们处理手势识别器发送的事件）。UIKit要求所有UI工作都发生在主线程上，因此即使您可以在不同的线程上运行这些函数，这样做也没有任何意义。你到底想在这里实现什么？@ipmcc我有一个可拖动的

UIImageView

和一个滑动检测器功能，它

println

“游戏结束”或“1分”取决于用户滑动的方式。每当我添加其中一个函数时，println函数将不起作用，但使

UIImageView

可拖动的函数起作用。我没有收到任何错误消息。函数就是不响应。我想他们必须在不同的线程上被调用，但如果你说那没有任何意义，我不知道该怎么做了。谢谢！这正是我要找的！