Summary of proxy methods for iOS UIApplication

1. Introduction

1>The whole application symbolizes that an application is a UIApplication object and uses the singleton design mode.

2>Access this singleton object through [UIApplication sharedApplication]

2. Common usage

1>Set the red number in the upper-right corner of the icon

App. applicationIconBadgeNumber = 10;

2>Set the style of the status bar

App. statusBarStyle = UIStatusBarStyleBlackOpaque;

3>Control display and hide of Status Bar

App. statusBarHidden = YES;

4>Show the circle above the status bar

App. networkActivityIndicatorVisible = YES;

5>Open external resources

• Open webpage

  [App openURL: [NSURL URLWithString: @ "http://www.baidu.com"];

• Call

  [App openURL: [NSURL URLWithString: @ "tel: // 10086"];

• Text message

  [App openURL: [NSURL URLWithString: @ "sms: // 10086"];

6> proxy properties when some system-level events occur in the application, the agent will be notified and handed over to the agent for processing)

@ Property (nonatomic, assign) id delegate;

Proxy method of UIApplicationDelegate

Once the pragma mark program is loaded and started)

• (BOOL) application :( UIApplication) application didfinishlaunchingwitexceptions :( NSDictionary) launchOptions

Call when The pragma mark application loses focus (if an app loses focus, it cannot interact with users)

• (Void) applicationWillResignActive :( UIApplication *) application

The pragma mark program is called when it enters the background.

• (Void) applicationDidEnterBackground :( UIApplication *) application

Called when The pragma mark program is about to enter the foreground

• (Void) applicationWillEnterForeground :( UIApplication *) application

Call when The pragma mark application gets the focus (an app can interact with users only after the focus is obtained)

• (Void) applicationDidBecomeActive :( UIApplication *) application

The pragma mark program may be called when it is about to be closed.

• (Void) applicationWillTerminate :( UIApplication *) application

When The pragma mark program receives a memory warning, it will call

• (Void) applicationDidReceiveMemoryWarning :( UIApplication *) application