我一直在关注WWDC 2010
的高级UIScrollView技术视频UIScrollView
我正在尝试创建无限滚动分页,但是我不确定如何为分页UIScrollView
创建平铺。我一直在使用本教程来指导无限分页以及这个堆栈交换答案。是否可以在分页UIScrollView
中创建这种效果,或者平铺主要用于连续滚动环境。谢谢你的帮助。
如果需要无限滚动,可以在滚动后更改元素位置。非常简单的示例和肮脏的代码,但我回家我帮助你:
import UIKit
class MainVC: UIViewController, UIScrollViewDelegate {
@IBOutlet var scrollView: UIScrollView!
var currentView: UIView?
var nextView: UIView?
var previousView: UIView?
override func viewDidLoad() {
super.viewDidLoad()
scrollView.isPagingEnabled = true
scrollView.delegate = self
generateViews()
}
func generateViews() {
let screenSize = UIScreen.main.bounds
currentView = UIView()
nextView = UIView()
previousView = UIView()
addPosition(cView: currentView!, nView: nextView!, pView: previousView!)
currentView?.backgroundColor = .red
nextView?.backgroundColor = .green
previousView?.backgroundColor = .blue
scrollView.addSubview(currentView!)
scrollView.addSubview(previousView!)
scrollView.addSubview(nextView!)
scrollView.contentSize = CGSize(width: screenSize.width * 3, height: screenSize.height)
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
if scrollView.contentOffset.x >= (UIScreen.main.bounds.width * 2) {
addPosition(cView: nextView!, nView: previousView!, pView: currentView!)
} else if scrollView.contentOffset.x == 0 {
addPosition(cView: previousView!, nView: currentView!, pView: nextView!)
}
scrollView.contentOffset = CGPoint(x: UIScreen.main.bounds.width, y: 0)
}
func addPosition(cView: UIView, nView: UIView, pView: UIView) {
let screenSize = UIScreen.main.bounds
cView.frame = CGRect(origin: CGPoint(x: screenSize.width, y: 0), size: screenSize.size)
nView.frame = CGRect(origin: CGPoint(x: screenSize.width * 2, y: 0), size: screenSize.size)
pView.frame = CGRect(origin: CGPoint(x: 0, y: 0), size: screenSize.size)
currentView = cView
nextView = nView
previousView = pView
}
}