[006]Swift 监听是否重新进入App、是否触发 home 键、是否被杀死

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 监听是否重新进入App
        NotificationCenter.default.addObserver(self, selector: #selector(applictionDidBecomeActive), name: UIApplication.didBecomeActiveNotification, object: nil)
        // 监听是否触发 home 键挂起App
        NotificationCenter.default.addObserver(self, selector: #selector(applicationWillResignActive), name: UIApplication.willResignActiveNotification, object: nil)
        // 监听App是否被杀死
        NotificationCenter.default.addObserver(self, selector: #selector(applicationKilled), name: UIApplication.willTerminateNotification, object: nil)
        
    }
    
    
    // 重新进入App时被调用
    @objc func applictionDidBecomeActive() {
        
    }
    
    // 触发 home 键，App 挂起时被调用
    @objc func applicationWillResignActive() {
        
    }
    
    // App是否被杀死时调用
    @objc func applicationKilled() {
        
    }
    
}