import UIKit

class ViewController: UIViewController {
    
    var webview:UIWebView!
    
    // 顶部刷新
    let header = MJRefreshNormalHeader()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        //创建webView并初始化
        let frame = CGRect(x:0, y:20, width:UIScreen.main.bounds.width,
                           height:UIScreen.main.bounds.height)
        self.webview = UIWebView(frame: frame)
        self.webview.scalesPageToFit = true
        self.view.addSubview(self.webview)
        
        //加载页面
        let request = URLRequest(url: URL(string: "http://hangge.com")!)
        self.webview.loadRequest(request)
        
        //下拉刷新相关设置
        header.setRefreshingTarget(self, refreshingAction: #selector(ViewController.headerRefresh))
        self.webview.scrollView.mj_header = header
    }
    
    //顶部下拉刷新
    @objc func headerRefresh(){
        print("下拉刷新.")
        sleep(2)
        //刷新页面
        self.webview.reload()
        //结束刷新
        self.webview.scrollView.mj_header.endRefreshing()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}