IOS Application生命周期

第一阶段
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
    NSLog(@"程序启动");
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    NSLog(@"加载完毕进入主页面");
}

第二阶段
- (void)applicationWillResignActive:(UIApplication *)application
{
    NSLog(@"按下 Home");
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    NSLog(@"回到桌面");
}

第三阶段
- (void)applicationWillEnterForeground:(UIApplication *)application
{    
    NSLog(@"点击桌面图标回到程序");
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    NSLog(@"加载完毕进入主页面");
}