我正在尝试检查用户是否在我的应用程序上上下滚动,但是没有调用scrollViewDidScroll方法

当我在应用程序上上下滚动时,为什么不打印 received scroll 有什么想法吗?

import UIKit

class CreateAccount: UIViewController, UITextFieldDelegate, UIScrollViewDelegate {

    @IBOutlet weak var scrollViewer: UIScrollView!
    @IBOutlet weak var usernameTextField: UITextField!
    @IBOutlet weak var emailTextField: UITextField!
    @IBOutlet weak var passwordTextField: UITextField!
    @IBOutlet weak var reenterPasswordTextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func scrollViewDidScroll(scrollView: UIScrollView) {
        print("received scroll")
    }

}

swift - 我的 scrollViewDidScroll 函数未接听电话-LMLPHP

最佳答案

添加滚动 View 委托(delegate)。每当你实现一个委托(delegate)方法时,你需要告诉它使用什么 Controller ,通常是 self 。它把我抓了几次。

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    scrollViewer.delegate = self
}

关于swift - 我的 scrollViewDidScroll 函数未接听电话,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/39549398/

10-12 03:37