从 UISwipeGestureRecognizer 和 UIScrollView 接收用户输入答案

【问题标题】：Receive user input from UISwipeGestureRecognizer and UIScrollView从 UISwipeGestureRecognizer 和 UIScrollView 接收用户输入
【发布时间】：2015-10-02 07:34:23
【问题描述】：

我正在尝试创建一个 UIScrollView，它在 scrollViewWillBeginDragging 上执行操作，并且还使用 UISwipeGestureRecognizer 识别左右滑动。当我使用 scrollViewWillBeginDragging 函数时，我在向左滑动时获得了所需的结果，但我的函数无法判断我是在执行向右还是向左滑动。如果我设置 detailScrollView.userInteractionEnabled = false，则gestureRecognizer 会正确执行，但视图不再滚动。这是我的代码：

override func viewDidLoad() {
    super.viewDidLoad()

    var leftSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
    var rightSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))

    leftSwipe.direction = .Left
    rightSwipe.direction = .Right

    view.addGestureRecognizer(leftSwipe)
    view.addGestureRecognizer(rightSwipe) }


func gestureRecognizer(UIGestureRecognizer,
    shouldRecognizeSimultaneouslyWithGestureRecognizer:UIGestureRecognizer) -> Bool {
        return true
}

func scrollViewWillBeginDragging(scrollView: UIScrollView) {
    if (counter < buttons.count) {
        serialSelected(buttons[counter])
        counter += 1
    }
}

func handleSwipes(sender:UISwipeGestureRecognizer) {
    if (sender.direction == .Left) {
        println("Swipe Left")
        var labelPosition = CGPointMake(self.contentView.frame.origin.x - 50.0, self.contentView.frame.origin.y);
        contentView.frame = CGRectMake( labelPosition.x , labelPosition.y , self.contentView.frame.size.width, self.contentView.frame.size.height)
    }

    if (sender.direction == .Right) {
        println("Swipe Right")
        var labelPosition = CGPointMake(self.contentView.frame.origin.x + 50.0, self.contentView.frame.origin.y);
        contentView.frame = CGRectMake( labelPosition.x , labelPosition.y , self.contentView.frame.size.width, self.contentView.frame.size.height)
    }
}

【问题讨论】：

标签： ios swift uiscrollview uigesturerecognizer

【解决方案1】：

根据您的源代码，shouldRecognizeSimultaneouslyWithGestureRecognizer:UIGestureRecognizer 永远不会被调用。

// Make yourself a delegate
class yourClass: parentClass, UIGestureRecognizerDelegate

// reference the delegate
leftSwipe.delegate = self
rightSwipe.delegate = self

【讨论】：