[英]Swift Change Xib Height Programmatically
我实现了2个Xib文件到View Controller(1个View,1个CollectionView)。 我想在滚动时显示/隐藏视图。 我可以隐藏view(设置高度:0),但是当我想返回(设置高度:50)时,它不起作用。
提前致谢。
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if scrollView.panGestureRecognizer.translation(in: scrollView).y < 0{
self.searchFieldView.heightAnchor.constraint(equalToConstant: 0).isActive = true
self.searchFieldView.clipsToBounds = true
//self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
else{
self.searchFieldView.heightAnchor.constraint(equalToConstant: 50).isActive = true
//self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
}
从xib中获取searchFieldView的高度,并根据条件更改其恒定值。
@IBOutlet weak var vwHeightConstraint: NSLayoutConstraint!
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if scrollView.panGestureRecognizer.translation(in: scrollView).y < 0{
vwHeightConstraint.constant = 0
self.searchFieldView.clipsToBounds = true
//self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}else{
vwHeightConstraint.constant = 50
//self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
}
希望它能正常工作。
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