ios - Swift:检测与 iOS 7 兼容的滑动手势

Question

我正在使用此代码来检测滑动手势:

    let swipeRight = UISwipeGestureRecognizer(target: self, action: Selector("rightSwiped"))
    swipeRight.direction = UISwipeGestureRecognizerDirection.Right
    self.matn.addGestureRecognizer(swipeRight)

    let swipeLeft = UISwipeGestureRecognizer(target: self, action: Selector("leftSwiped"))
    swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
    self.matn.addGestureRecognizer(swipeLeft)

    let swipeDown = UISwipeGestureRecognizer(target: self, action: Selector("downSwiped"))
    swipeDown.direction = UISwipeGestureRecognizerDirection.Down
    self.matn.addGestureRecognizer(swipeDown)

    let swipeUp = UISwipeGestureRecognizer(target: self, action: Selector("upSwiped"))
    swipeUp.direction = UISwipeGestureRecognizerDirection.Up
    self.matn.addGestureRecognizer(swipeUp)

func rightSwiped(sender:UISwipeGestureRecognizer)
{
    println("right swiped ")
}

func leftSwiped()
{
    println("left swiped ")
}

func downSwiped()
{
    println("down swiped ")
}

func upSwiped()
{
    println("Up swiped ")
}

但 UISwipeGestureRecognizerDirection 在 iOS8 及更高版本中可用。如何让它与 iOS7 兼容？

Answer 1

正如 Wain 在评论中提到的那样，Direction 从 3.2 开始可用，因此您可以将它与 iOS 7 一起使用。我已经测试了您的代码，并且它在 Deployment target 7.0 上运行良好>。所以你可以在 iOS 7 上使用它。