我想检测用户滚动时,我使用了UIScrollView,我在ViewController中实现了UIScrollViewDelegate并尝试了scrollViewDidScroll,scrollViewDidEndScrollingAnimation以及所有其他活动,但这些事件从未被调用过。
import UIKit
class ViewController: UIViewController, UIScrollViewDelegate {
@IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
let xOrigin = self.view.frame.width
let view1 = View1(frame: CGRect(x: 0, y: 0, width:self.view.frame.width, height: self.view.frame.height))
let view2 = View2(frame: CGRect(x: xOrigin, y: 0, width: self.view.frame.width, height: self.view.frame.height))
let view3 = View3(frame: CGRect(x: xOrigin * 2, y: 0, width: self.view.frame.width, height: self.view.frame.height))
scrollView.addSubview(view1)
scrollView.addSubview(view2)
scrollView.addSubview(view3)
self.scrollView.contentSize = CGSize(width: self.view.frame.width * 3, height: self.view.frame.height)
// hide the scrol bar.
scrollView?.showsHorizontalScrollIndicator = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
print("end scroll")
}
func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
print("end scroll")
}
}
答案 0 :(得分:11)
您只需将委托添加到viewDidLoad()
func:
override func viewDidLoad() {
super.viewDidLoad()
//add this line
self.scrollView.delegate = self
}