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简化通知中心的使用

作者： YouXianMing 授权本站转载。

简化通知中心的使用

说明

1. 简化通知中心，笔者曾经实现过不需要移除的通知中心，基于弱引用集合（相对于强引用集合如NSArray，NSDictionary等）编写，本例子并无太多新意

2. 简化的通知中心由一个对象组织控制，不需要你手动移除被监听的对象，这是唯一的一点点有新意的地方

3. 在处理接收通知对象的地方，笔者提供了一个方法来简化取值操作，相对应的，发送通知消息的时候，被发送的对象也请使用指定的格式（都是用weak修饰，无需担心被持有）

源码

https://github.com/YouXianMing/NotificationCenter

// //  NotificationCenterObject.h //  NotificationCenter // //  Created by YouXianMing on 15/7/15. //  Copyright (c) 2015年 YouXianMing. All rights reserved. //  #import @interface PostObject : NSObject   @property (nonatomic, strong) NSString *flag; @property (nonatomic, weak)   id        data;   /**  *  便利构造器初始化对象  *  *  @param flag 识别标签  *  @param data 数据  *  *  @return 实例对象  */ + (instancetype)postObjectWithFlag:(NSString *)flag data:(id)data;   /**  *  处理通知中心事件  *  *  @param sender 通知中心的通知对象  *  *  @return 实例对象  */ + (instancetype)accessNotificationCenterObject:(id)sender;   @end   ///////////////////////////////////////////////////////////////////////////////////////////   @interface NotificationCenterObject : NSObject   /**  *  === 必须先使用此方法进行初始化 ===  *  *  初始化通知中心  *  *  @param observer 观察对象  *  @param name     注册标签  *  @param selector 执行用selector  *  *  @return 实例对象  */ + (instancetype)withObserver:(id)observer                 registerName:(NSString *)name                     selector:(SEL)selector;   /**  *  给指定注册标签发信息  *  *  @param name     注册标签  *  @param postData 发送的对象  */ + (void)postToRegisterName:(NSString *)name data:(PostObject *)postData;   @property (nonatomic, readonly, strong) NSString *name; @property (nonatomic, readonly, weak)   id        observer;   /**  *  移除  */ - (void)remove;   /**  *  重新添加上  */ - (void)reAdd;   @end   ///////////////////////////////////////////////////////////////////////////////////////////  /**  *  创建通知对象  *  *  @param flag 标签  *  @param data 传递的数据  *  *  @return 通知对象  */ static inline PostObject * POST_OBJECT(NSString *flag, id data) {          return [PostObject postObjectWithFlag:flag data:data]; }  /**  *  处理通知的对象  *  *  @param sender 接收的通知对象  *  *  @return 通知对象  */ static inline PostObject * ACCESS_POST_OBJECT(id sender) {          return [PostObject accessNotificationCenterObject:sender]; }  /**  *  发送通知消息  *  *  @param name       指定的标签  *  @param postObject 通知的对象  *  */ static inline void POST_MSG_TO(NSString *name, PostObject *postObject) {      [NotificationCenterObject postToRegisterName:name data:postObject]; }  /**  *  注册通知中心  *  *  @param name     指定的标签  *  @param observer 被注册的对象  *  @param selector 执行的句柄  *  *  @return 实例对象  */ static inline NotificationCenterObject * REGISTER_MSG_CENTER_WITH(NSString *name, id observer, SEL selector) {          return [NotificationCenterObject withObserver:observer registerName:name selector:selector]; }

// //  NotificationCenterObject.m //  NotificationCenter // //  Created by YouXianMing on 15/7/15. //  Copyright (c) 2015年 YouXianMing. All rights reserved. // #import "NotificationCenterObject.h" @implementation PostObject + (instancetype)postObjectWithFlag:(NSString *)flag data:(id)data {  PostObject *postObject = [PostObject new];  postObject.flag  = flag;  postObject.data  = data;  return postObject; } + (instancetype)accessNotificationCenterObject:(id)sender {  PostObject *postData = nil;  if ([sender isKindOfClass:[NSNotification class]]) {   NSNotification *notiData = sender;   if ([notiData.object isKindOfClass:[PostObject class]]) {    postData = notiData.object;   }  }  return postData; } @end @interface NotificationCenterObject () @property (nonatomic, strong) NSString *name; @property (nonatomic, weak)   id  observer; @property (nonatomic)   SEL    observerSelector; @property (nonatomic)   BOOL   haveAddObserver; @end @implementation NotificationCenterObject + (void)postToRegisterName:(NSString *)name data:(PostObject *)postData {  [[NSNotificationCenter defaultCenter] postNotificationName:name object:postData]; } + (instancetype)withObserver:(id)observer registerName:(NSString *)name selector:(SEL)selector {  NotificationCenterObject *notificationCenterObject = [NotificationCenterObject new];  notificationCenterObject.name       = name;  notificationCenterObject.observer      = observer;  notificationCenterObject.observerSelector    = selector;  notificationCenterObject.haveAddObserver     = YES;  [[NSNotificationCenter defaultCenter] addObserver:observer selector:selector name:name object:nil];  return notificationCenterObject; } - (void)remove {  if (self.haveAddObserver == YES && _name && _observer) {   self.haveAddObserver = NO;   [[NSNotificationCenter defaultCenter] removeObserver:_observer name:_name object:nil];  } } - (void)reAdd {  if (self.haveAddObserver == NO && _name && _observer) {   self.haveAddObserver = YES;   [[NSNotificationCenter defaultCenter] addObserver:_observer selector:_observerSelector name:_name object:nil];  } } - (void)dealloc {  if (self.haveAddObserver == YES) {   NSLog(@"已经释放");   [[NSNotificationCenter defaultCenter] removeObserver:_observer name:_name object:nil];  } } @end