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pull to reload功能。

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

以下是我尝试这样做的方法。

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

请帮助我理解手势识别器的行为。一个工作示例代码将是一个很好的帮助。

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

拉动刷新是在iOS中构建的。您可以在swift中执行此操作

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

var refreshControl = UIRefreshControl()

override func viewDidLoad() {
   super.viewDidLoad()

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

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

在某些时候你可以结束刷新。

At some point you could end refreshing.

refreshControl.endRefreshing()

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