IOS Uiapplicatin and its delegate

each uiapplication represents a should be shipped program, and UIApplication is a singleton class;

Once the iOS program is started, the first object created is the UIApplication object;// get UIApplication . Object *******************
uiapplication*appliction = [uiapplication sharedapplication];
// 1 : Set the red reminder number ********************** in the upper right corner of the application icon
Appliction.Applicationiconbadgenumber = 998;

// 2 : Set the visibility of the networking indicator *********************************
Appliction.networkactivityindicatorvisible = YES;

/** 3 : The status bar style status bar is hidden, displayed *****************************
3.1:Controller Management:
Style:-(Uistatusbarstyle) Preferredstatusbarstyle;
Visibility of:-(BOOL) Prefersstatusbarhidden;
3.2:byApplicationUnified Management one set The entire program is the same as the status bar
Benefits: Disposable Management to add animation effects
*: If you want to useuiapplicationto manage the status bar, you first have to modifyInfo.plistthe Settings
*/
// style
Appliction.Statusbarstyle = uistatusbarstylelightcontent;
// Visibility of Drive the painting
[ApplictionSetstatusbarhidden:YES withanimation:Uistatusbaranimationfade];

/* 4: Set openUrl ************************************
Call
UIApplication *app = [UIApplication sharedapplication];
[App Openurl:[nsurl urlwithstring:@ "tel://10086"];

Send SMS
[App Openurl:[nsurl urlwithstring:@ "sms://10086"];

send e-mail
[App Openurl:[nsurl urlwithstring:@ "Mailto://[email protected]"];

open a Web resource
[App Openurl:[nsurl urlwithstring:@ "http://ios.itcast.cn"];

Open Otherappprogram ....
*/=================================uiapplication's Delegate===============uiapplication delegate when the app was disturbed, Generates some system events, UIApplication notifies its delegate object, allowing the delegate agent to handle these system events each time you create a new iOS program, Xcode automatically generates a delegate class as the UIApplication delegate the main method inside to deal with the event

1 /*2 * The method called when the program is started is automatically called by the system3  */4-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) Launchoptions5 {6     //Override point for customization after application launch.7     returnYES;8 }9 Ten /* One * will lose focus, do not interact when calling this method A  */ -  -- (void) Applicationwillresignactive: (UIApplication *) Application the { -      - } -  +  - /* + * When the should be shipped program enters the background, it usually saves the state of the current program in the method . A  */ at- (void) Applicationdidenterbackground: (UIApplication *) Application - { -      - } -  -  in /* - * When the should be shipped program enters the foreground, it calls to reload the saved data . to  */ +- (void) Applicationwillenterforeground: (UIApplication *) Application - { the      * } $ Panax Notoginseng  - /* the * Regain focus to interact with users +  */ A- (void) Applicationdidbecomeactive: (UIApplication *) Application the { +  - } $  $  - /* - * This method is called when the should be shipped program is about to be destroyed if the should be shipped program is in a suspended state and cannot be called. the  */ -- (void) Applicationwillterminate: (UIApplication *) ApplicationWuyi { the      - } Wu  - /* About * should be shipped program memory warning method $ * Typically frees unwanted memory in this method -  */ -- (void) Applicationdidreceivememorywarning: (UIApplication *) Application - { A  +}