88课：手势滑动和摇一揺的实现方法

课程笔记文集地址：Udemy课程：The Complete iOS 9 Developer Course - Build 18 Apps

这节课没有用到 Storyboard，全部用代码实现的。

滑动手势

创建手势只需要三行代码（关键点是 UISwipeGestureRecognizer）：

// 一：创建滑动手势
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.swiped(_:)))
// 二：设置手势滑动的方向
swipeRight.direction = UISwipeGestureRecognizerDirection.Right
// 三：把手势添加到当前界面
self.view.addGestureRecognizer(swipeRight)
        
//再创建一个上滑的手势
let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.swiped(_:)))
swipeUp.direction = UISwipeGestureRecognizerDirection.Up
self.view.addGestureRecognizer(swipeUp)

给手势添加方法：

func swiped(gesture: UIGestureRecognizer) {
    if let swipeGesture = gesture as? UISwipeGestureRecognizer {
        switch swipeGesture.direction {
            case UISwipeGestureRecognizerDirection.Right:
              print("User swiped Right")
            case UISwipeGestureRecognizerDirection.Up:
              print("User swiped Up")
            default:
              break
        }
    }
}

摇一摇

摇一摇比手势简单多了，代码如下：

override func motionEnded(motion: UIEventSubtype, withEvent event: UIEvent?) {
    if event?.subtype == UIEventSubtype.MotionShake {
        // 在这里写摇一摇之后要执行的事件
        print("Device was shaken")
    }
}