ios - UIScrollView:水平分页，垂直滚动？

Question

如何强制 UIScrollView在哪个分页和滚动中仅在给定时刻垂直或水平移动？

我的理解是 directionalLockEnabled属性应该实现这一点，但对角滑动仍然会导致 View 对角滚动，而不是将运动限制在单个轴上。

编辑:为了更清楚，我想允许用户水平或垂直滚动​​，但不能同时滚动。

Answer 1

为了将来引用，我以 Andrey Tanasov 的回答为基础，提出了以下可以正常工作的解决方案。

首先定义一个变量来存储 contentOffset 并将其设置为 0,0 坐标

var positionScroll = CGPointMake(0, 0)

现在在 scrollView 委托(delegate)中实现以下内容:

override func scrollViewWillBeginDragging(scrollView: UIScrollView) {
    // Note that we are getting a reference to self.scrollView and not the scrollView referenced passed by the method
    // For some reason, not doing this fails to get the logic to work
    self.positionScroll = (self.scrollView?.contentOffset)!
}

override func scrollViewDidScroll(scrollView: UIScrollView) {

    // Check that contentOffset is not nil
    // We do this because the scrollViewDidScroll method is called on viewDidLoad
    if self.scrollView?.contentOffset != nil {

        // The user wants to scroll on the X axis
        if self.scrollView?.contentOffset.x > self.positionScroll.x || self.scrollView?.contentOffset.x < self.positionScroll.x {

            // Reset the Y position of the scrollView to what it was BEFORE scrolling started
            self.scrollView?.contentOffset = CGPointMake((self.scrollView?.contentOffset.x)!, self.positionScroll.y);
            self.scrollView?.pagingEnabled = true
        }

        // The user wants to scroll on the Y axis
        else {
            // Reset the X position of the scrollView to what it was BEFORE scrolling started
            self.scrollView?.contentOffset = CGPointMake(self.positionScroll.x, (self.scrollView?.contentOffset.y)!);
            self.collectionView?.pagingEnabled = false
        }

    }

}

希望这可以帮助。