8.18 手势识别器 UIGestureRecognizer

import UIKit

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
//        瞬间触发：作用时间短，位移相对小，一般只会触发一次
//        tap/swipe
//        持续触发：作用时间长，位移相对大，会定时或相隔一段距离触发
//        pinch/rotato/long press/pan
//        点击

        let tap = UITapGestureRecognizer(target: self, action: #selector(didTap(_:)))
        self.view.addGestureRecognizer(tap)
        
//        pinch 捏合

        let up = UIPinchGestureRecognizer(target: self, action: #selector(didUp(_:)))
        self.view.addGestureRecognizer(up)
        
        let se = UIScreenEdgePanGestureRecognizer(target: self, action:#selector(didSe(_:)))
        self.view.addGestureRecognizer(se)
        
        let leftSwipe = UISwipeGestureRecognizer(target: self, action:#selector(didSwipe(_:)))
        leftSwipe.direction = .Left    //滑向某个方向
        self.view.addGestureRecognizer(leftSwipe)
    }
    
    
    func didSwipe(sender: UISwipeGestureRecognizer){
        print("left")
    }

    func didTap(sender: UITapGestureRecognizer) {
        //返回值是参数坐标
        let location = sender.locationInView(self.view)
        print("tap:\(location)")

        //UIAlertView + UIActionSheet
        let alertCtrl = UIAlertController(title: "警告", message: "不要乱点", preferredStyle: .Alert) //如果使用.ActionSheet，提示栏从下方弹上来
        
        let action01 = UIAlertAction(title: "OK", style: .Default) {
            (action) in
            print("OK")
        }
        
        let action02 = UIAlertAction(title: "Cancel", style: .Cancel) { (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)
    }

//    捏合
    func didUp(sender: UIPinchGestureRecognizer) {
        let actionC1 = UIAlertController(title: "hehe", message: "HAHA", preferredStyle: .Alert)
        let action01 = UIAlertAction(title: "OK", style: .Default) {
            (action) in
            print("OK")

        }
    
        actionC1.addAction(action01)
        self.presentViewController(actionC1, animated: true, completion: nil)
    }
    
    func didSe(sender: UIPinchGestureRecognizer) {
        let actionC2 = UIAlertController(title: "???", message: "!!!", preferredStyle: .Alert)
        let action02 = UIAlertAction(title: "OK", style: .Default) {
            (action) in
            print("OK")
        }
        actionC2.addAction(action02)
        self.presentViewController(actionC2, animated: true, completion: nil)
    }
}

// * xxxView.transform = CGaffineTransformMakeRotation(CGFloat(M_PI_2)旋转某视图
//HUD控件自己研究，非常实用，但是要注意“时机”