Noticfication

통지의 요소

알림 센터(NSNotificationCenter)

NSNotification 알림

 //  
- (NSString *)name;
//  ( )
- (id)object;
//  ( )
- (NSDictionary *)userInfo;

+ (instancetype)notificationWithName:(NSString *)aName object:(id)anObject;
+ (instancetype)notificationWithName:(NSString *)aName object:(id)anObject userInfo:(NSDictionary *)aUserInfo;
- (instancetype)initWithName:(NSString *)name object:(id)object userInfo:(NSDictionary *)userInfo;

알림 게시

- (void)postNotification:(NSNotification *)notification;
 notification ， notification 、 、 

- (void)postNotificationName:(NSString *)aName object:(id)anObject;
 aName ，anObject 

- (void)postNotificationName:(NSString *)aName object:(id)anObject userInfo:(NSDictionary *)aUserInfo;
 aName ，anObject ，aUserInfo 

등록 알림 모니터

// observer： ， 
// aSelector： ， ， 
// aName： 。 nil， ， 
// anObject： 。 anObject aName nil， 
- (void)addObserver:(id)observer selector:(SEL)aSelector name:(NSString *)aName object:(id)anObject;

// name： 
// obj： 
// block： ， block
// queue： block ， nil， 
- (id)addObserverForName:(NSString *)name object:(id)obj queue:(NSOperationQueue *)queue usingBlock:(void (^)(NSNotification *note))block;

등록 취소 알림 감청기

- (void)removeObserver:(id)observer;
- (void)removeObserver:(id)observer name:(NSString *)aName object:(id)anObject;

- (void)dealloc {
    //[super dealloc];   ARC 
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

공통 UIDevice 알림

//  
UIDeviceOrientationDidChangeNotification
//  
UIDeviceBatteryStateDidChangeNotification
//  
UIDeviceBatteryLevelDidChangeNotification
//  ( )
UIDeviceProximityStateDidChangeNotification