ios - 如何在滑动时向下移动 ImageView ？

Question

我有一个 ImageView ，我需要用户向下滑动该图像，但我不知道该怎么做。我放了一个日志来了解滑动是否有效以及是否正常工作，我希望图像在我滑动时移动。我是 iOS 的新手。你能帮帮我吗？？

这是我的 ViewController 类:

class MainScreenViewController: UIViewController {

    @IBOutlet var buttonMenuEntry: UIButton
    @IBOutlet var buttonMenuExit: UIButton
    @IBOutlet var mainscreenEntryView: UIImageView
    @IBOutlet var mainscreenCard: UIImageView

    override func viewDidLoad() {
        super.viewDidLoad()

        var swipeCardDown = UISwipeGestureRecognizer(target: self, action: "respondToGesture:")
        swipeCardDown.direction = UISwipeGestureRecognizerDirection.Down
        self.mainscreenCard.addGestureRecognizer(swipeCardDown)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func buttonMenuClicked(sender: UIButton){

        buttonMenuEntry.hidden = true
        buttonMenuExit.hidden = false
    }

    func respondToGesture(gesture: UIGestureRecognizer){
        println("Swiped down")

    }
}

谢谢。

Answer 1

最简单的方法是:

func respondToGesture(gesture: UIGestureRecognizer){
    UIView.animateWithDuration(0.35, animations: {

            mainscreenCard.frame = CGRectMake(mainscreenCard.frame.origin.x,
                self.view.frame.height,
                mainscreenCard.frame.size.width,
                mainscreenCard.frame.size.height)
        })

}

根据需要调整时间