面试题系列一之 程序生命周期

程序生命周期// Created by Yan on 16/4/20.‍‍font‍‍// Copyright © 2016年 baidu. All rights reserved.#import "AppDelegate.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {NSLog(@"程序启动完毕");return YES;}- (void)applicationWillResignActive:(UIApplication *)application {NSLog(@"程序即将暂停");}- (void)applicationDidEnterBackground:(UIApplication *)application {NSLog(@"程序进入后台");}- (void)applicationWillEnterForeground:(UIApplication *)application {NSLog(@"程序即将进入前台");}- (void)applicationDidBecomeActive:(UIApplication *)application {NSLog(@"程序再次激活");}- (void)applicationWillTerminate:(UIApplication *)application {NSLog(@"程序即将意外退出");}@end

程序第一次启动2016-04-20 23:50:31.266 runtime[4416:298880] 程序启动完毕2016-04-20 23:50:31.271 runtime[4416:298880] 程序再次激活command shift + H/ home键回到后台2016-04-20 23:50:36.352 runtime[4416:298880] 程序即将暂停2016-04-20 23:50:37.084 runtime[4416:298880] 程序进入后台再次启动2016-04-20 23:50:39.008 runtime[4416:298880] 程序即将进入前台2016-04-20 23:50:39.533 runtime[4416:298880] 程序再次激活