首先,在您的UIPageViewController内找到scrollview并添加UIScrollViewDelegate。
for view in self.pageViewController!.view.subviews {
if let subView = view as? UIScrollView {
subView.delegate = self
subView.isScrollEnabled = true
subView.bouncesZoom = false
}
}
在您的ViewController类中扩展UIScrollViewDelegate
对于UIScrollViewDelegate中的方法"scrollViewDidScroll"和"scrollViewWillEndDragging",您可以添加以下内容:
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if(currentIndex == 0 && scrollView.contentOffset.x < scrollView.bounds.size.width){
scrollView.contentOffset = CGPoint(x:scrollView.bounds.size.width, y:0.0)
}else if(currentIndex == 2 && scrollView.contentOffset.x > scrollView.bounds.size.width) {
scrollView.contentOffset = CGPoint(x:scrollView.bounds.size.width, y:0.0)
}
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if(currentIndex == 0 && scrollView.contentOffset.x < scrollView.bounds.size.width){
scrollView.contentOffset = CGPoint(x:scrollView.bounds.size.width, y:0.0)
}else if(currentIndex == 2 && scrollView.contentOffset.x > scrollView.bounds.size.width) {
scrollView.contentOffset = CGPoint(x:scrollView.bounds.size.width, y:0.0)
}
}
func scrollViewDidScroll(scrollView: UIScrollView) {
if currentIndex == 0 && scrollView.contentOffset.x < scrollView.bounds.size.width {
scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0)
} else if currentIndex == totalViewControllers - 1 && scrollView.contentOffset.x > scrollView.bounds.size.width {
scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0)
}
}
func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if currentIndex == 0 && scrollView.contentOffset.x < scrollView.bounds.size.width {
scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0)
} else if currentIndex == totalViewControllers - 1 && scrollView.contentOffset.x > scrollView.bounds.size.width {
scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0)
}
}