iPhone开发之使用NSNotification(通知)

主要函数、方法

//
+ (id)defaultCenter;
    
//增加通知事件
- (void)addObserver:(id)observer selector:(SEL)aSelector name:(NSString *)aName object:(id)anObject;

//类似于接受开始通知事件
- (void)postNotification:(NSNotification *)notification;
- (void)postNotificationName:(NSString *)aName object:(id)anObject;
- (void)postNotificationName:(NSString *)aName object:(id)anObject userInfo:(NSDictionary *)aUserInfo;

//移除通知
- (void)removeObserver:(id)observer;
- (void)removeObserver:(id)observer name:(NSString *)aName object:(id)anObject;

 

实例：

//在mainviewcontroller中添加观察者

 //接受编辑/完成通知
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(setEditButtonOn)
                                                 name:@"SETEDITBUTTONON"
                                               object:nil];
   
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(setEditButtonOff)
                                                 name:@"SETEDITBUTTONOFF"
                                               object:nil];
//通知触发的事件
-(void)setEditButtonOn{
    self.editButton.selected = YES;
}

- (void)setEditButtonOff{
    self.editButton.selected = NO;
}

//发送编辑通知
    [[NSNotificationCenter defaultCenter] postNotificationName:
     @"SETEDITBUTTONON" object:nil];

//最后移除观察者
  [[NSNotificationCenter defaultCenter]removeObserver:self name:@"SETEDITBUTTONON" object:nil];