Swift - 手机摇晃的监测和响应

摇晃手机也是一种常用的交互手段（比如微信摇一摇功能）。iOS SDK中已经将shake事件方便地融合进去了，就像触发touch事件一样简单，发生摇晃事件后程序会自动执行。

import UIKit
 
class ViewController: UIViewController {
 
    override func viewDidLoad() {
        super.viewDidLoad()
    }
     
    override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
        print("开始摇晃")
    }
    
    override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
        print("摇晃结束")
    }
    
    override func motionCancelled(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {
        print("摇晃被意外终止")
    }
    
}