问题
I am trying to custom a extension for Parallax Header. However, it's not working perfectly. The table header view always floats and overlaps cells.
Extension code:
extension UITableView {
func addImageHeaderView(headerView headerView: UIView, height: CGFloat) {
self.contentInset = UIEdgeInsetsMake(height, 0, 0, 0)
self.contentOffset = CGPoint(x: 0, y: -height)
self.tableHeaderView = headerView
self.tableHeaderView?.frame = CGRect(x: 0, y: 0, width: self.bounds.width, height: height)
}
func updateHeaderView(height kTableHeaderHeight: CGFloat) {
var headerRect = CGRect(x: 0, y: -kTableHeaderHeight , width: self.bounds.width, height: kTableHeaderHeight)
if self.contentOffset.y < -kTableHeaderHeight {
headerRect.origin.y = self.contentOffset.y
headerRect.size.height = -self.contentOffset.y
}
self.tableHeaderView?.frame = headerRect
}
}
Implementing Code :
tableView.addImageHeaderView(headerView: viewHeader, height: 100)
func scrollViewDidScroll(scrollView: UIScrollView) {
tableView.updateHeaderView(height: 200)
}
Am I wrong at something? Please show me if you know.
回答1:
Can you please try to set the following in viewDidLoad
self.edgesForExtendedLayout = UIEdgeInsetsZero;
in swift
self.edgesForExtendedLayout = .None
Also what you can try to do is to check the result of the following
tableView.addImageHeaderView(headerView: viewHeader, height: 0)
func scrollViewDidScroll(scrollView: UIScrollView) {
tableView.updateHeaderView(height: 200)
}
please notice that i changed the height from 100 to 0 i did it because the height value will change the contentInset of your table view and this is exactly the distance from the top corner
来源：https://stackoverflow.com/questions/38596829/swift-parallax-header-view-scrollview-overlap-cells