如何在Swift中使用pull刷新? [英] How to use pull to refresh in Swift?
本文介绍了如何在Swift中使用pull刷新?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
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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