class ViewController: UIViewController {

   override func viewDidLoad() {
       super.viewDidLoad()
       
       //手势识别器
       //UIGestureRecognizer
       //识别在某一个视图上的操作
       let tap = UITapGestureRecognizer(target: self, action: #selector(didTap(_:)))
       self.view.addGestureRecognizer(tap)
   }

   func didTap(sender: UITapGestureRecognizer) {
       //返回参考self.view的坐标
       let location = sender.locationInView(self.view)
       print("tap: \(location)")
       
       //UIAlertView + UIActionSheet
       let alertCtrl = UIAlertController(title: "警告", message: "不要乱点", preferredStyle: .ActionSheet)
       
       let action01 = UIAlertAction(title: "OK", style: .Default) { (action) in
           print("OK")
       }
       
       let action02 = UIAlertAction(title: "Cancel", style: .Destructive) { (action) in
           print("Cancel")
       }
       
       let action03 = UIAlertAction(title: "3", style: .Default) { (action) in
           print("3")
       }
       
       alertCtrl.addAction(action01)
       alertCtrl.addAction(action02)
       alertCtrl.addAction(action03)
       
       self.presentViewController(alertCtrl, animated: true, completion: nil)
   }
}

PKHUD

func didTap(sender: UITapGestureRecognizer){
        let url  = NSURL(string: "https://github.com")
        let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) in
            dispatch_async(dispatch_get_main_queue(), { 
                HUD.hide()
                HUD.flash(.Success, delay: 2, completion: nil)
            })
        }
        task.resume()
        HUD.show(.SystemActivity)
    }