如何使用拉刷新在Swift?

我正在使用swift构建一个RSS阅读器，需要实现重新加载功能。

以下是我如何努力做到这一点。

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:

财产的自我。刷新'未在super初始化。init调用

请帮助我理解手势识别器的行为。一个工作样例代码将是一个很大的帮助。

谢谢。

当前回答

我建议在每个类中使用pull to Refresh的扩展。

1)创建一个空的swift文件:文件-新建-文件- swift文件。

2)添加以下内容

    //  AppExtensions.swift

    import Foundation
    import UIKit    

    var tableRefreshControl:UIRefreshControl = UIRefreshControl()    

    //MARK:- VIEWCONTROLLER EXTENSION METHODS
    public extension UIViewController
    {
        func makePullToRefreshToTableView(tableName: UITableView,triggerToMethodName: String){

            tableRefreshControl.attributedTitle = NSAttributedString(string: "TEST: Pull to refresh")
            tableRefreshControl.backgroundColor = UIColor.whiteColor()
            tableRefreshControl.addTarget(self, action: Selector(triggerToMethodName), forControlEvents: UIControlEvents.ValueChanged)
            tableName.addSubview(tableRefreshControl)
        }
        func makePullToRefreshEndRefreshing (tableName: String)
        {
            tableRefreshControl.endRefreshing()
//additional codes

        }
    }

3)在你的视图控制器中调用这些方法:

  override func viewWillAppear(animated: Bool) {

self.makePullToRefreshToTableView(bidderListTable, triggerToMethodName: "pullToRefreshBidderTable")
}

4)在某些时候，你想要结束刷新:

  func pullToRefreshBidderTable() {
self.makePullToRefreshEndRefreshing("bidderListTable")    
//Code What to do here.
}
OR    
self.makePullToRefreshEndRefreshing("bidderListTable")

2015-10-21 09:35:04

其他回答

斯威夫特4

var refreshControl: UIRefreshControl!

override func viewDidLoad() {
    super.viewDidLoad()

    refreshControl = UIRefreshControl()
    refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
    refreshControl.addTarget(self, action: #selector(refresh), for: .valueChanged)
    tableView.addSubview(refreshControl) 
}

@objc func refresh(_ sender: Any) {
    //  your code to reload tableView
}

你可以停止刷新:

refreshControl.endRefreshing()

2017-01-06 15:27:32

使用storyboard和Swift的解决方案:

Open your .storyboard file, select a TableViewController in your storyboard and "Enable" the Table View Controller: Refreshing feature in the Utilities. Open the associated UITableViewController class and add the following Swift 5 line into the viewDidLoad method. self.refreshControl?.addTarget(self, action: #selector(refresh), for: UIControl.Event.valueChanged) Add the following method above the viewDidLoad method func refresh(sender:AnyObject) { // Updating your data here... self.tableView.reloadData() self.refreshControl?.endRefreshing() }

2014-12-18 13:07:09

拉动刷新是iOS内置的。你可以像这样快速完成

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  
}

在某些时候，你可能会停止刷新。

refreshControl.endRefreshing()

2014-06-29 12:32:05

Anhil的回答对我帮助很大。

然而，在进一步试验之后，我注意到建议的解决方案有时会导致不那么漂亮的UI故障。

相反，采用这种方法*让我成功了。

*迅速2.1

//Create an instance of a UITableViewController. This will host your UITableView.
private let tableViewController = UITableViewController()

//Add tableViewController as a childViewController and set its tableView property to your UITableView.
self.addChildViewController(self.tableViewController)
self.tableViewController.tableView = self.tableView
self.refreshControl.addTarget(self, action: "refreshData:", forControlEvents: .ValueChanged)
self.tableViewController.refreshControl = self.refreshControl

2016-02-04 12:54:28