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。
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")
你可以使用tableView的子类:
import UIKit
protocol PullToRefreshTableViewDelegate : class {
func tableViewDidStartRefreshing(tableView: PullToRefreshTableView)
}
class PullToRefreshTableView: UITableView {
@IBOutlet weak var pullToRefreshDelegate: AnyObject?
private var refreshControl: UIRefreshControl!
private var isFirstLoad = true
override func willMoveToSuperview(newSuperview: UIView?) {
super.willMoveToSuperview(newSuperview)
if (isFirstLoad) {
addRefreshControl()
isFirstLoad = false
}
}
private func addRefreshControl() {
refreshControl = UIRefreshControl()
refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
refreshControl.addTarget(self, action: "refresh", forControlEvents: .ValueChanged)
self.addSubview(refreshControl)
}
@objc private func refresh() {
(pullToRefreshDelegate as? PullToRefreshTableViewDelegate)?.tableViewDidStartRefreshing(self)
}
func endRefreshing() {
refreshControl.endRefreshing()
}
}
1 -在接口构建器改变类你的tableView PullToRefreshTableView或创建一个PullToRefreshTableView编程
在你的视图控制器中实现PullToRefreshTableViewDelegate
当表视图开始刷新时，tableViewDidStartRefreshing(tableView: PullToRefreshTableView)将在视图控制器中被调用
4 -调用yourTableView.endRefreshing()来完成刷新
