1.修改AppDelegate.m如下
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { NSLog(@"%@",@"应用启动并进行初始化"); return YES; } - (void)applicationDidBecomeActive:(UIApplication *)application { NSLog(@"%@",@"应用进入前台并处于活动状态"); } - (void)applicationWillResignActive:(UIApplication *)application { NSLog(@"%@",@"应用从活动状态进入到非活动状态"); } - (void)applicationDidEnterBackground:(UIApplication *)application { NSLog(@"%@",@"应用进入后台"); } - (void)applicationWillEnterForeground:(UIApplication *)application { NSLog(@"%@",@"应用进入前台，但是还没有处于活动状态"); } - (void)applicationWillTerminate:(UIApplication *)application { NSLog(@"%@",@"应用被终止"); } - (BOOL)application:(UIApplica
阅读背景：
IOS应用生命周期
来源：互联网
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