import UIKit
import PKHUD

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        //創(chuàng)建點(diǎn)擊事件，執(zhí)行連接百度網(wǎng)址
        let tap = UITapGestureRecognizer(target: self, action: #selector(did(_:)))
        self.view.addGestureRecognizer(tap)
    }

    func did(sender: UITapGestureRecognizer) {
        let url = NSURL(string: "https://www.baidu.com")
        let task = NSURLSession.sharedSession().dataTaskWithURL(url!){
            (data, response, error) in
            dispatch_async(dispatch_get_main_queue(), {
                if let _ = error {
                    HUD.flash(.Error, delay: 2) //如果錯(cuò)誤就顯示這里2秒   
                }
                HUD.hide()          //如果連接到網(wǎng)頁，就把載入標(biāo)識(shí)隱藏
            })
        }
        task.resume()
        HUD.show(.SystemActivity)   //連接網(wǎng)絡(luò)是顯示載入的標(biāo)識(shí)
    }
}

編譯運(yùn)行結(jié)果如下：

載入中...

Paste_Image.png

連接失敗...

Paste_Image.png