1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 2     NSLog(@"app啟動完畢的時候調用"); 3     return YES; 4 } 5  6 - (void)applicationDidReceiveMemoryWarning:(UIApplication *)application { 7     NSLog(@"app接收到內存警告時調用"); 8 } 9 10 - (void)applicationDidEnterBackground:(UIApplication *)application {11     NSLog(@"app進入后臺的時候調用");12 }13 14 - (void)applicationWillResignActive:(UIApplication *)application {15     NSLog(@"app將要被掛起");16 }17 18 - (void)applicationWillEnterForeground:(UIApplication *)application {19     NSLog(@"app回到前臺");20 }21 22 - (void)applicationDidBecomeActive:(UIApplication *)application {23     NSLog(@"app激活后");24 }25 26 - (void)applicationWillTerminate:(UIApplication *)application {27     NSLog(@"app將要關閉");28 }29  

1 int main(int argc, char * argv[]) {2     @autoreleasepool {3         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));4     }5 }