我在UIScrollView中有两个(可能更多)视图,并希望使用分页.当我尝试使用UIScrollView的默认分页选项时出现问题,因为视图具有不同的宽度,无法正确分页.
所以我已经实现了一个有效的自定义分页代码.但是,当滚动较慢时,它不会按预期运行. (它回到没有动画的原始位置.)
以下是我目前通过uiscrollviewdelegate进行自定义分页的方法
func scrollViewWillEndDragging(_ scrollView: UIScrollView,withVeLocity veLocity: CGPoint,targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if direction == 1{
targetContentOffset.pointee.x = 0
}else{
targetContentOffset.pointee.x = 100
}
}
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
if scrollView.panGestureRecognizer.translation(in: scrollView.superview).x > 0 {
direction = 1
}
else {
direction = 0
}
}
我想要的是：
是)我有的：
解决方法
尝试下面的自定义UIScrollView类示例
import UIKit
public class BaseScrollViewController: UIViewController,uiscrollviewdelegate {
public var leftVc: UIViewController!
public var middleVc: UIViewController!
public var rightVc: UIViewController!
public var initialContentOffset = CGPoint() // scrollView initial offset
public var maximumWidthFirstView : CGFloat = 0
public var scrollView: UIScrollView!
public class func containerViewWith(_ leftVC: UIViewController,middleVC: UIViewController,rightVC: UIViewController) -> BaseScrollViewViewController {
let container = BaseScrollViewViewController()
container.leftVc = leftVC
container.middleVc = middleVC
container.rightVc = rightVC
return container
}
override public func viewDidLoad() {
super.viewDidLoad()
setuphorizontalscrollview()
}
func setuphorizontalscrollview() {
scrollView = UIScrollView()
scrollView.isPagingEnabled = true
scrollView.showsHorizontalScrollIndicator = false
scrollView.bounces = false
let view = (
x: self.view.bounds.origin.x,y: self.view.bounds.origin.y,width: self.view.bounds.width,height: self.view.bounds.height
)
scrollView.frame = CGRect(x: view.x,y: view.y,width: view.width,height: view.height
)
self.view.addSubview(scrollView)
let scrollWidth = 3 * view.width
let scrollHeight = view.height
scrollView.contentSize = CGSize(width: scrollWidth,height: scrollHeight)
leftVc.view.frame = CGRect(x: 0,y: 0,height: view.height
)
middleVc.view.frame = CGRect(x: view.width,height: view.height
)
rightVc.view.frame = CGRect(x: 2 * view.width,height: view.height
)
addChildViewController(leftVc)
addChildViewController(middleVc)
addChildViewController(rightVc)
scrollView.addSubview(leftVc.view)
scrollView.addSubview(middleVc.view)
scrollView.addSubview(rightVc.view)
leftVc.didMove(toParentViewController: self)
middleVc.didMove(toParentViewController: self)
rightVc.didMove(toParentViewController: self)
scrollView.contentOffset.x = middleVc.view.frame.origin.x
scrollView.delegate = self
}
public func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
self.initialContentOffset = scrollView.contentOffset
}
public func scrollViewDidScroll(_ scrollView: UIScrollView) {
if maximumWidthFirstView != 0
{
if scrollView.contentOffset.x < maximumWidthFirstView
{
scrollView.isScrollEnabled = false
let newOffset = CGPoint(x: maximumWidthFirstView,y: self.initialContentOffset.y)
self.scrollView!.setContentOffset(newOffset,animated: false)
scrollView.isScrollEnabled = true
}
}
}
}
使用BaseScrollViewController
let left = FirstController.init() let middle = MiddleController() let right = RightController.init() let container = BaseScrollViewController.containerViewWith(left,middleVC: middle,rightVC: right) container.maximumWidthFirstView = 150
输出：
GitHub要点示例代码：https://gist.github.com/mspvirajpatel/58dac2fae0d3b4077a0cb6122def6570