import UIKit

class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
    
    //新闻列表
    @IBOutlet weak var newsTableView: UITableView!
    
    //新闻数组集合
    var dataArray:[HanggeArticle] = [HanggeArticle]()
    
    //拉刷新控制器
    var refreshControl = UIRefreshControl()
    
    var timer: NSTimer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.automaticallyAdjustsScrollViewInsets = false
        
        //添加刷新
        refreshControl.addTarget(self, action: "refreshData",
            forControlEvents: UIControlEvents.ValueChanged)
        refreshControl.attributedTitle = NSAttributedString(string: "下拉刷新数据")
        newsTableView.addSubview(refreshControl)
        refreshData()
    }
    
    //滚动视图开始拖动
    func scrollViewWillBeginDragging(scrollView: UIScrollView) {
        if !refreshControl.refreshing {
            refreshControl.attributedTitle = NSAttributedString(string: "下拉刷新数据")
        }
    }
    
    // 刷新数据
    func refreshData() {
        refreshControl.attributedTitle = NSAttributedString(string: "数据加载中......")
        timer = NSTimer.scheduledTimerWithTimeInterval(2.0, target: self,
            selector: "timeOut", userInfo: nil, repeats: true)
    }
    
    //计时器时间到
    func timeOut() {
        //移除老数据
        self.dataArray.removeAll()
        //随机添加5条新数据（时间是当前时间）
        for _ in 0..<5 {
            let atricle = HanggeArticle(title: "新闻标题\(Int(arc4random()%1000))",
                createDate: NSDate())
            self.dataArray.append(atricle)
        }
        self.newsTableView.reloadData()
        self.refreshControl.endRefreshing()
        
        timer.invalidate()
        timer = nil
    }
    
    
    // 返回记录数
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataArray.count;
    }
    
    // 返回单元格内容
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)
        -> UITableViewCell {
            let cell = UITableViewCell(style: UITableViewCellStyle.Subtitle,
                reuseIdentifier: "myCell")
            
            //设置单元格标题
            let atricle: HanggeArticle = dataArray[indexPath.row] as HanggeArticle
            cell.textLabel?.text = atricle.title
            
            //设置单元格副标题
            let dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
            let str = dateFormatter.stringFromDate(atricle.createDate)
            cell.detailTextLabel?.text = str
            
            return cell;
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        
    }
}

//新闻结构体
struct HanggeArticle {
    var title:String
    var createDate:NSDate
}