首先向下滑动/滚动将消失视图

Question

如何使UIScrollView从上到下开始滚动。当我滑动(向下(时，它会首先向下滚动而不是向上滚动并消失。我现在拥有的是，我可以先向上滚动然后向下滚动，而向下滚动它消失了。 这是我的代码 -

func scrollViewDidScroll(_ scrollView: UIScrollView) {
//for toogle swipe view
if scrollView.contentOffset.y < 120 {
self.swipeMsgView.isHidden = false
}else {
self.swipeMsgView.isHidden = true
}
//for making bottom inset
if scrollView.contentOffset.y < 190 {
var contentInset:UIEdgeInsets = scrollView.contentInset
contentInset.bottom = scrollView.contentOffset.y-100
scrollView.contentInset = contentInset
}
//when swipe down
if scrollView.contentOffset.y == 0 {
if !isScrollDownFirstTime{
UIView.animate(withDuration: 0.5, animations: {
self.dismiss(animated: true, completion: nil)
})
}
}
//for tracking first time scrolling
if scrollView.contentOffset.y > 150 {
isScrollDownFirstTime = false
}
}

它工作正常。但是我想在用户首先滑动或向下滚动时消失视图(滑动手势不起作用(。有没有优雅的方法可以使用这个现有功能做到这一点？谢谢。

Answer 1

@Serg Smyk，这是我如何解决问题的。

fileprivate var isScrollDownFirstTime = true
func scrollViewDidScroll(_ scrollView: UIScrollView) {
print("Content y offet : (scrollView.contentOffset.y)")
//for toogle swipe view
if scrollView.contentOffset.y < 120 {
self.swipeMsgView.isHidden = false
} else {
self.swipeMsgView.isHidden = true
}

//for making bottom inset
if scrollView.contentOffset.y < 190 {
var contentInset:UIEdgeInsets = scrollView.contentInset
contentInset.bottom = scrollView.contentOffset.y-100
scrollView.contentInset = contentInset
}

//when swipe down
if scrollView.contentOffset.y == 0 {
print(CLASS_NAME+" -- scrollViewDidScroll() -- contentOffset.y = 0")
if !isScrollDownFirstTime{
UIView.animate(withDuration: 0.5, animations: {
self.dismiss(animated: true, completion: nil)
})
}
}
if scrollView.contentOffset.y < 1 {
print(CLASS_NAME+" -- scrollViewDidScroll() -- contentOffset.y<0")
UIView.animate(withDuration: 0.5, animations: {
self.dismiss(animated: true, completion: nil)
})
}
//for tracking first time scrolling
if scrollView.contentOffset.y > 150 {
isScrollDownFirstTime = false
}
}