AppDelegateのメソッドが呼ばれるタイミング

AppDelegate

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {return true}

    func applicationWillResignActive(application: UIApplication) {}

    func applicationDidEnterBackground(application: UIApplication) {}

    func applicationWillEnterForeground(application: UIApplication) {}

    func applicationDidBecomeActive(application: UIApplication) {}

    func applicationWillTerminate(application: UIApplication) {}
}

起動時

application
applicationDidBecomeActive

終了直前

applicationWillResignActive

終了時

applicationDidEnterBackground

復帰直前

applicationWillEnterForeground

復帰時

applicationDidBecomeActive

kill時

applicationWillTerminate