程序生命周期

//  Created by Yan on 16/4/20.‍‍font‍‍

//  Copyright © 2016年 baidu. All rights reserved.

#import "AppDelegate.h"

AppDelegate ()

@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