本文介绍了从未调用事件滚动 (scrollViewDidScroll) - Swift 3的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
限时送ChatGPT账号..我想检测用户何时滚动,我使用了 UIScrollView,我在 ViewController 中实现了 UIScrollViewDelegate 并尝试了 scrollViewDidScroll、scrollViewDidEndScrollingAnimation 和所有其他事件,但这些事件从未被调用.
I would like to detect when the user scroll, I used a UIScrollView, I implemented the UIScrollViewDelegate in my ViewController and tried scrollViewDidScroll, scrollViewDidEndScrollingAnimation and all the others but these events are never called.
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")
}
}
推荐答案
您只需将委托添加到您的 viewDidLoad()
函数:
You just have to add the delegate to your viewDidLoad()
func:
override func viewDidLoad() {
super.viewDidLoad()
//add this line
self.scrollView.delegate = self
}
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