如何在 Swift 中使用 pull 刷新? [英] How to use pull to refresh in Swift?

问题描述

我正在使用 swift 构建一个 RSS 阅读器，需要实现重新加载功能.

I am building an RSS reader using swift and need to implement pull to reload functionality.

这是我正在尝试的方法.

Here is how i am trying to do it.

class FirstViewController: UIViewController,
    UITableViewDelegate, UITableViewDataSource {

   @IBOutlet var refresh: UIScreenEdgePanGestureRecognizer
   @IBOutlet var newsCollect: UITableView

   var activityIndicator:UIActivityIndicatorView? = nil

   override func viewDidLoad() {
       super.viewDidLoad()
       self.newsCollect.scrollEnabled = true
      // Do any additional setup after loading the view, typically from a nib.

      if nCollect.news.count <= 2{
          self.collectNews()
       }
      else{
          self.removeActivityIndicator()
       }
      view.addGestureRecognizer(refresh)
   }



@IBAction func reload(sender: UIScreenEdgePanGestureRecognizer) {
    nCollect.news = News[]()
    return newsCollect.reloadData()
}

我得到:

属性self.refresh"未在 super.init 调用中初始化

Property 'self.refresh' not initialized at super.init call

请帮助我了解手势识别器的行为.一个有效的示例代码会很有帮助.

Please help me to understand the behaviour of Gesture recognisers. A working sample code will be a great help.

谢谢.

推荐答案

拉动刷新 内置于 iOS.你可以像

Pull to refresh is built in iOS. You could do this in swift like

let refreshControl = UIRefreshControl()

override func viewDidLoad() {
   super.viewDidLoad()

   refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
   refreshControl.addTarget(self, action: #selector(self.refresh(_:)), for: .valueChanged)
   tableView.addSubview(refreshControl) // not required when using UITableViewController
}

@objc func refresh(_ sender: AnyObject) {
   // Code to refresh table view  
}

在某个时候，您可能会结束刷新.

At some point you could end refreshing.

refreshControl.endRefreshing()

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