程序加载完毕
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
}
程序失去焦点，即将失活
- (void)applicationWillResignActive:(UIApplication *)application
{
}
程序进入后台
- (void)applicationDidEnterBackground:(UIApplication *)application
{
}
程序从后台回到前台（即将进入前台）
- (void)applicationWillEnterForeground:(UIApplication *)application
{
}
程序获取焦点
- (void)applicationDidBecomeActive:(UIApplication *)application
{
}
程序即将退出
- (void)applicationWillTerminate:(UIApplication *)application
{
}