The actual intent of each const inside IOS uiapplication

Background notification: screen operation notification, etc.

Uikit_extern nsstring *const uiapplicationdidenterbackgroundnotification Ns_available_ios (4_0);

Uikit_extern nsstring *const uiapplicationwillenterforegroundnotification Ns_available_ios (4_0);

Uikit_extern nsstring *const uiapplicationdidfinishlaunchingnotification;

Uikit_extern nsstring *const uiapplicationdidbecomeactivenotification;

Uikit_extern nsstring *const uiapplicationwillresignactivenotification;

Uikit_extern nsstring *const uiapplicationdidreceivememorywarningnotification;

Uikit_extern nsstring *const uiapplicationwillterminatenotification;

Uikit_extern nsstring *const uiapplicationsignificanttimechangenotification;

Uikit_extern nsstring *const uiapplicationwillchangestatusbarorientationnotification __TVOS_PROHIBITED; UserInfo contains nsnumber with new orientation

Uikit_extern nsstring *const uiapplicationdidchangestatusbarorientationnotification __TVOS_PROHIBITED; UserInfo contains nsnumber with old orientation

Uikit_extern nsstring *const uiapplicationstatusbarorientationuserinfokey __tvos_prohibited; UserInfo dictionary key for status bar orientation

Uikit_extern nsstring *const uiapplicationwillchangestatusbarframenotification __TVOS_PROHIBITED; UserInfo contains nsvalue with new frame

Uikit_extern nsstring *const uiapplicationdidchangestatusbarframenotification __tvos_prohibited; UserInfo contains nsvalue with old frame

Uikit_extern nsstring *const uiapplicationstatusbarframeuserinfokey __tvos_prohibited; UserInfo dictionary key for status bar frame

Uikit_extern nsstring *const uiapplicationbackgroundrefreshstatusdidchangenotification NS_AVAILABLE_IOS (7 _0) __tvos_prohibited;

Uikit_extern nsstring *const uiapplicationlaunchoptionsurlkey Ns_available_ios (3_0); UserInfo contains nsurl with launch URL

Uikit_extern nsstring *const uiapplicationlaunchoptionssourceapplicationkey Ns_available_ios (3_0); UserInfo contains nsstring with launch app bundle ID

Uikit_extern nsstring *const uiapplicationlaunchoptionsremotenotificationkey ns_available_ios (3_0) __TVOS_ prohibited; UserInfo contains nsdictionary with payload

Uikit_extern nsstring *const uiapplicationlaunchoptionslocalnotificationkey ns_available_ios (4_0) __TVOS_ prohibited; UserInfo contains a uilocalnotification

Uikit_extern nsstring *const uiapplicationlaunchoptionsannotationkey Ns_available_ios (3_2); UserInfo contains object with the Annotation property list

Uikit_extern nsstring *const uiapplicationprotecteddatawillbecomeunavailable Ns_available_ios (4_0);

Uikit_extern nsstring *const uiapplicationprotecteddatadidbecomeavailable Ns_available_ios (4_0);

Uikit_extern nsstring *const uiapplicationlaunchoptionslocationkey Ns_available_ios (4_0); App is launched in response to a corelocation event.

Uikit_extern nsstring *const uiapplicationlaunchoptionsnewsstanddownloadskey ns_available_ios (5_0) __TVOS_ prohibited; UserInfo contains an nsarray of Nkassetdownload identifiers

Uikit_extern nsstring *const uiapplicationlaunchoptionsbluetoothcentralskey Ns_available_ios (7_0); UserInfo contains an nsarray of Cbcentralmanager restore identifiers

Uikit_extern nsstring *const uiapplicationlaunchoptionsbluetoothperipheralskey NS_AVAILABLE_IOS (7_0); UserInfo contains an nsarray of Cbperipheralmanager restore identifiers

Uikit_extern nsstring *const uiapplicationlaunchoptionsshortcutitemkey ns_available_ios (9_0) __TVOS_PROH ibited; UserInfo contains the Uiapplicationshortcutitem used to launch the app.

Key in Options Dict passed to Application[will | Did]finishlaunchingwithoptions and info for Uiapplicationdidfinishlaun Chingnotification

Uikit_extern nsstring *const uiapplicationlaunchoptionsuseractivitydictionarykey NS_AVAILABLE_IOS (8_0); Sub-dictionary present in Launch options if user activity is present

Uikit_extern nsstring *const uiapplicationlaunchoptionsuseractivitytypekey Ns_available_ios (8_0); Key in user activity dictionary for the activity type

Uikit_extern nsstring *const uiapplicationopensettingsurlstring Ns_available_ios (8_0); //Turn on system positioning

Keys for Application:openURL:options:

Uikit_extern nsstring *const uiapplicationopenurloptionssourceapplicationkey Ns_available_ios (9_0); Value is an nsstring containing the bundle ID of the originating application

Uikit_extern nsstring *const uiapplicationopenurloptionsannotationkey Ns_available_ios (9_0); Value is a property-list typed object corresponding to what the originating application passed in Uidocumentinteraction Controller ' s annotation property

Uikit_extern nsstring *const uiapplicationopenurloptionsopeninplacekey Ns_available_ios (9_0); Value is a bool NSNumber, set to YES if the file needs to being copied before use

Content size Category Constants //Contents type constant

Uikit_extern nsstring *const uicontentsizecategoryextrasmall Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategorysmall Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategorymedium Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategorylarge Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategoryextralarge Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategoryextraextralarge Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategoryextraextraextralarge Ns_available_ios (7_0);

Accessibility sizes //accessible rows

Uikit_extern nsstring *const uicontentsizecategoryaccessibilitymedium Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategoryaccessibilitylarge Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategoryaccessibilityextralarge Ns_available_ios (7_0);

Uikit_extern nsstring *const uicontentsizecategoryaccessibilityextraextralarge NS_AVAILABLE_IOS (7_0);

Uikit_extern nsstring *const uicontentsizecategoryaccessibilityextraextraextralarge NS_AVAILABLE_IOS (7_0) ;

Notification is emitted when the user have changed the preferredcontentsizecategory for the system//notification is issued, changing the Preferredcontentsizecategory

Uikit_extern nsstring *const uicontentsizecategorydidchangenotification Ns_available_ios (7_0); UserInfo dictionary would contain new value for Uicontentsizecategorynewvaluekey

Uikit_extern nsstring *const uicontentsizecategorynewvaluekey Ns_available_ios (7_0); NSString instance with new content size category in UserInfo

This notification was posted after the user takes a screenshot (for example by pressing both the home and lock screen bu ttons)//After this notification is published, the user needs one (for example, by pressing the home button and the lock screen button)

Uikit_extern nsstring *const uiapplicationuserdidtakescreenshotnotification Ns_available_ios (7_0);

Extension Point Identifier Constants //Extension dot identifier constant

Uikit_extern nsstring *const uiapplicationkeyboardextensionpointidentifier Ns_available_ios (8_0);

Ns_assume_nonnull_end

The actual intent of each const inside IOS uiapplication