UIApplication, stand for App

  • use singleton, UIApplication.shared.

Functions - operations for App level

  • info number if Icon, such as badgeNumber
  • Network Indicator
  • statusBar (frame.size.height 20)
  • statusBar notification
  • open URL, Telephone Number, Message

Example

  • open a url in Safari (out of current App)
  • if we want to intercept a url, we can process in here ``` //打开网页 UIApplication *app = [UIApplication shareApplication]; //url: header + content

NSURL *url = [NSURL URLWithString:@"xxx"]; [app openURL:url];
//隐藏状态栏

  • (BOOL) prefersStatusBarHidden { return YES; } ```

    UIApplication Delegate

  • processing Application Life Cycle

  • press App
    didFinishLaunch -> didBecomeActive (means we can begin interact)

  • press Home
    -> ResignActive(lose focus) -> didEnterBackground ( Enter into background)
    For example, a incoming call interrupt current app, the current app will go into background. We may save data in here

  • comeBack to App
    -> willEnterForeground

  • Other
    -> applicationDIdReceiveMemoryWarning:(UIApplication*) application
    memory warning, we should delete inMemory cache

-> willTerminate
app will be terminated

常见的代理方法

  1. (void)applicationWillResignActive:(UIApplication *)application 说明：当应用程序将要入非活动状态执行，在此期间，应用程序不接收消息或事件，比如来电话了

  2. (void)applicationDidBecomeActive:(UIApplication *)application 说明：当应用程序入活动状态执行，这个刚好跟上面那个方法相反

  3. (void)applicationDidEnterBackground:(UIApplication *)application 说明：当程序被推送到后台的时候调用。所以要设置后台继续运行，则在这个函数里面设置即可

  4. (void)applicationWillEnterForeground:(UIApplication *)application 说明：当程序从后台将要重新回到前台时候调用，这个刚好跟上面的那个方法相反。

  5. (void)applicationWillTerminate:(UIApplication *)application 说明：当程序将要退出是被调用，通常是用来保存数据和一些退出前的清理工作。这个需要设置 UIApplicationExitsOnSuspend 的键值。

  6. (void)applicationDidReceiveMemoryWarning:(UIApplication *)application 说明：iPhone 设备只有有限的内存，如果为应用程序分配了太多内存操作系统会终止应用程序的运行，在终止前会执行这个方法，通常可以在这里进行内存清理工作防止程序被终止

  7. (void)applicationSignificantTimeChange:(UIApplication*)application 说明：当系统时间发生改变时执行

  8. (void)applicationDidFinishLaunching:(UIApplication*)application 说明：当程序载入后执行

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