iOS -- UIApplication

標籤：

UIApplicationDelegate協議
// app接收到記憶體警告時調用
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application;
// app進入後台時調用（比如按了home鍵）
- (void)applicationDidEnterBackground:(UIApplication *)application;
// app啟動完畢時調用
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions;

Application系統事件

程式載入完畢 application: didFinishLaunchingWithOptions:
程式擷取焦點 applicationDidBecomeActive:
程式進入後台 applicationDidEnterBackground:
程式失去焦點 applicationWillResignActive:
程式從後台回到前台 applicationWillEnterForeground:
記憶體警告 applicationDidReceiveMemoryWarning:
程式即將退出 applicationWillTerminate:

iOS -- UIApplication