通知機制
通知機制需要掌握的有三個部分:通知的發佈,通知的監聽,通知的移除。
通知中心
通知(NSNotification)
- (NSString *)name; // 通知的名稱
- (id)object; // 通知發佈者(是誰要發佈通知)
- (NSDictionary *)userInfo; // 一些額外的信息(通知發佈者傳遞給通知接收者的信息內容)
+ (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;
發佈通知
通知中心(NSNotificationCenter)提供了相應的方法來幫助發佈通知
- (void)postNotification:(NSNotification *)notification;
- (void)postNotificationName:(NSString *)aName object:(id)anObject;
- (void)postNotificationName:(NSString *)aName object:(id)anObject userInfo:(NSDictionary *)aUserInfo;
註冊通知監聽器
通知中心(NSNotificationCenter)提供了方法來註冊一個監聽通知的監聽器(Observer)
- (void)addObserver:(id)observer selector:(SEL)aSelector name:(NSString *)aName object:(id)anObject;
- (id)addObserverForName:(NSString *)name object:(id)obj queue:(NSOperationQueue *)queue usingBlock:(void (^)(NSNotification *note))block;
取消註冊通知監聽器
- (void)removeObserver:(id)observer;
- (void)removeObserver:(id)observer name:(NSString *)aName object:(id)anObject;
- (void)removeObserver:(id)observer;
- (void)removeObserver:(id)observer name:(NSString *)aName object:(id)anObject;
PS:需要示例代碼的在評論中留下郵箱哦,我發給你~