滚动另一个UIScrollView时停止动画UIScrollView

Question

我们说我有多个滚动视图，我希望在任何给定时间只能打开其中一个（scrollView.contentOffset != 0）。因此，当scroll view 1处于打开状态且滚动scroll view 2时，scroll view 1应该动画关闭。当我快速打开scroll view 1和scroll view 2时会出现此问题;当发生这种情况时，scroll view 1仍然在减速并且scroll view 2开启会尝试强制scroll view 1关闭并打破动画，有时不会关闭。 解决此问题的一种方法是禁用滚动，直到滚动视图完成减速。但是，我正在寻找能够更加无缝地处理这个问题的其他解决方案。 我试过了scrollView.layer.removeAllAnimations()。这并不能阻止减速动画。我希望scroll view 1的动画在滚动scroll view 2后立即停止，然后scroll view 1可以设置为contentOffset = 0。

  

确定scroll view是打开还是关闭。

func scrollViewDidScroll(scrollView: UIScrollView) {
    scrollView.bounces = scrollView.contentOffset.x > 20
    if scrollView.contentOffset.x < self.lastContentOffset && scrollView.contentOffset.x < 70 {
        ifOpening = false
    }
    else if scrollView.contentOffset.x > 5 {
        ifOpening = true
    }
    self.lastContentOffset = scrollView.contentOffset.x

}

  

拖动scroll view后，关闭所有其他scroll view。

func scrollViewWillBeginDragging(scrollView: UIScrollView) {

    for eachScrollView in taskArrayScrollView{
        if  eachScrollView != scrollView {
            eachScrollView.layer.removeAllAnimations()
            UIView.animateWithDuration(0.2,
                delay: 0.5,
                options: .CurveEaseIn ,
                animations: { eachScrollView.contentOffset.x = 0 },
                completion: nil
            )
        }
    }
}

  

将scroll view与offset 0或70

对齐

func scrollViewDidEndDragging(scrollViewa: UIScrollView, willDecelerate decelerate: Bool) {
    let intialContentOffset = scrollViewa.contentOffset.x
    var originalContentOffset: CGFloat
    var finalContentOffset: CGFloat
    var minOffset: CGFloat

    if intialContentOffset == boundOfScreen.width{
        return
    }

    if ifOpening{
        minOffset = 20.0
        originalContentOffset = 0
        finalContentOffset = 70
    }

    else {
        minOffset = 50.0
        originalContentOffset = 0
        finalContentOffset = 70
    }

    if (!decelerate){
        if intialContentOffset < minOffset {
            UIView.animateWithDuration(0.2,
                delay: 0.1,
                options: .CurveEaseIn ,
                animations: { scrollViewa.contentOffset.x = originalContentOffset },
                completion: {
                    finished in scrollViewa.userInteractionEnabled = true
                }
            )
        }
        else {
            UIView.animateWithDuration(0.2,
                delay: 0.1,
                options: .CurveEaseIn ,
                animations: { scrollViewa.contentOffset.x = finalContentOffset },
                completion: {
                    finished in scrollViewa.userInteractionEnabled = true
                }
            )
        }
    }
}


func scrollViewDidEndDecelerating(scrollViewb: UIScrollView) {
    let intialContentOffset = scrollViewb.contentOffset.x
    var originalContentOffset: CGFloat
    var finalContentOffset: CGFloat
    var minOffset: CGFloat
    //println("intialContentOffset: \(intialContentOffset)")

    if ifOpening{
        minOffset = 20.0
        originalContentOffset = 0
        finalContentOffset = 70
        //println("dec: opening")
    }

    else {
        minOffset = 50.0
        originalContentOffset = 0
        finalContentOffset = 70
        //println("dec: closing")
    }


    if intialContentOffset < minOffset {
        UIView.animateWithDuration(0.2,
            delay: 0.1,
            options: .CurveEaseIn ,
            animations: {scrollViewb.contentOffset.x = originalContentOffset },
            completion: {
                finished in scrollViewb.userInteractionEnabled = true
            }
        )
    }
    else {
        UIView.animateWithDuration(0.2,
            delay: 0.1,
            options: .CurveEaseIn ,
            animations: {scrollViewb.contentOffset.x = finalContentOffset },
            completion: {
                finished in scrollViewb.userInteractionEnabled = true
            }

        )
    }
}

Answer 1

嗯......我找到了一个解决方法。我使用变量scroll view来跟踪是否打开了另一个scroll view，如果是，则在完成动画后关闭当前动画func scrollViewDidScroll(scrollView: UIScrollView) { scrollView.bounces = scrollView.contentOffset.x > 20 if scrollView.contentOffset.x < self.lastContentOffset && scrollView.contentOffset.x < 70 { isOpening = false } else if scrollView.contentOffset.x > 5 { isOpening = true viewOpenCounter = true } self.lastContentOffset = scrollView.contentOffset.x } func scrollViewWillBeginDragging(scrollView: UIScrollView) { if !viewOpenCounter { for eachScrollView in taskArrayScrollView { if eachScrollView != scrollView { UIView.animateWithDuration(0.2, delay: 0.5, options: .CurveEaseIn , animations: { eachScrollView.contentOffset.x = 0 }, completion: nil )} } } } func scrollViewDidEndDragging(scrollViewa: UIScrollView, willDecelerate decelerate: Bool) { viewOpenCounter = false let intialContentOffset = scrollViewa.contentOffset.x var originalContentOffset: CGFloat var finalContentOffset: CGFloat var minOffset: CGFloat if intialContentOffset == boundOfScreen.width{ return } if isOpening{ minOffset = 20.0 originalContentOffset = 0 finalContentOffset = 70 } else { minOffset = 50.0 originalContentOffset = 0 finalContentOffset = 70 } if (!decelerate){ //println("no dec \(intialContentOffset)") if intialContentOffset < minOffset { UIView.animateWithDuration(0.2, delay: 0.1, options: .CurveEaseIn , animations: { scrollViewa.contentOffset.x = originalContentOffset }, completion: { finished in scrollViewa.userInteractionEnabled = true if self.viewOpenCounter { UIView.animateWithDuration(0.2, animations: { scrollViewa.contentOffset.x = 0 }, completion: { finished in self.viewOpenCounter = false } ) } } ) } else { UIView.animateWithDuration(0.2, delay: 0.1, options: .CurveEaseIn , animations: { scrollViewa.contentOffset.x = finalContentOffset }, completion: { finished in scrollViewa.userInteractionEnabled = true if self.viewOpenCounter { UIView.animateWithDuration(0.2, animations: { scrollViewa.contentOffset.x = 0 }, completion: { finished in self.viewOpenCounter = false } ) } } ) } } } func scrollViewDidEndDecelerating(scrollViewb: UIScrollView) { viewOpenCounter = false let intialContentOffset = scrollViewb.contentOffset.x var originalContentOffset: CGFloat var finalContentOffset: CGFloat var minOffset: CGFloat //println("intialContentOffset: \(intialContentOffset)") if isOpening{ minOffset = 20.0 originalContentOffset = 0 finalContentOffset = 70 //println("dec: opening") } else { minOffset = 50.0 originalContentOffset = 0 finalContentOffset = 70 //println("dec: closing") } if intialContentOffset < minOffset { UIView.animateWithDuration(0.2, delay: 0.1, options: .CurveEaseIn , animations: {scrollViewb.contentOffset.x = originalContentOffset }, completion: { finished in scrollViewb.userInteractionEnabled = true if self.viewOpenCounter { UIView.animateWithDuration(0.2, animations: { scrollViewb.contentOffset.x = 0 }, completion: { finished in self.viewOpenCounter = false } ) } } ) } else { UIView.animateWithDuration(0.2, delay: 0.1, options: .CurveEaseIn , animations: {scrollViewb.contentOffset.x = finalContentOffset }, completion: { finished in scrollViewb.userInteractionEnabled = true if self.viewOpenCounter { UIView.animateWithDuration(0.2, animations: { scrollViewb.contentOffset.x = 0 }, completion: { finished in self.viewOpenCounter = false } ) } } ) } } 。不确定这是否有效。

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