最近有朋友问通知的底层怎么实现，然后我大致的理了下:
1.通知是单例来的
2.通知可以注册与注销，说明里面有数组在控制着
3.通知是要实现方法的，说明里面有协议存在
4.通知是有设置通知接收者的，说明这是使用了代理的
综合上述说明，我自己基于blcok写了套自己的通知：
主要是使用两个方法
// 接收通知
+ (void)addBlocksObject:(NotifBlock)object WithKey:(NSString *)key;
// 发送通知
+ (void)sendNotificationWithKey:(NSString *)key Info:(NSDictionary *)message;
先在需要接收的地方添加上block，然后在需要传值出来的地方发送通知（信息通过message来传递）
使用方法
先对应key添加blcok
[NotificationCenterBlock addBlocksObject:^(NSDictionary *info) {
NSLog(@"%s -- %@",__func__,info);
} WithKey:@"zzz"];
然后再对应key发送消息
[NotificationCenterBlock sendNotificationWithKey:@"zzz" Info:@{@"JAJAAA":@"SSDDDDD",@"JAJAAAss":@"SSDDDDDss"}];
其中的key就是接收和发送的识别钥匙，也就是对应key发送与添加block，同时这里的block是可以添加多个的。
下面是这个通知类的代码
NotificationCenterBlock.h
//
// NotificationCenterBlock.h
// ZZZ
//
// Created by zxw on 17/5/4.
// Copyright © 2017年 tianshikechuang. All rights reserved.
//
#import <Foundation/Foundation.h>
typedef void(^NotifBlock)(NSDictionary * info);
@interface NotificationCenterBlock : NSObject
// 发送通知
+ (void)sendNotificationWithKey:(NSString *)key Info:(NSDictionary *)message;
// 接收通知
+ (void)addBlocksObject:(NotifBlock)object WithKey:(NSString *)key;
+ (instancetype)shareNotificationCenterBlockWithKey:(NSString *)key;
+ (instancetype)NotificationCenterBlockWithKey:(NSString *)key;
- (instancetype)initNotificationCenterBlockWithKey:(NSString *)key;
- (void)sendNotificationInfo:(NSDictionary *)message;
- (void)addBlocksObject:(NotifBlock)object;
- (void)removeAllBlocksObject;
+ (void)removeAllBlocksObjectWithKey:(NSString *)key;
@end
NotificationCenterBlock.m
//
// NotificationCenterBlock.m
// ZZZ
//
// Created by zxw on 17/5/4.
// Copyright © 2017年 tianshikechuang. All rights reserved.
//
#import "NotificationCenterBlock.h"
@interface NotificationCenterBlock ()
@property(nonatomic, strong) NSString * key;
@property(nonatomic, strong) NSMutableDictionary * keyBlockDic;
@end
@implementation NotificationCenterBlock
/* --- 单例创建 --- */
static NotificationCenterBlock *notif = nil;
- (instancetype)init{
if (notif) {
return notif;
}
if (self = [super init]) {
self.keyBlockDic = [NSMutableDictionary dictionary];
notif = self;
}
return self;
}
- (instancetype)initNotificationCenterBlockWithKey:(NSString *)key{
self = [[NotificationCenterBlock alloc] init];
self.key = key;
return self;
}
+ (instancetype)shareNotificationCenterBlockWithKey:(NSString *)key{
return [NotificationCenterBlock NotificationCenterBlockWithKey:key];
}
+ (instancetype)NotificationCenterBlockWithKey:(NSString *)key{
return [[NotificationCenterBlock alloc] initNotificationCenterBlockWithKey:key];
}
/* --- 发送通知 --- */
+ (void)sendNotificationWithKey:(NSString *)key Info:(NSDictionary *)message{
NotificationCenterBlock * notif = [NotificationCenterBlock shareNotificationCenterBlockWithKey:key];
[notif sendNotificationInfo:message];
}
- (void)sendNotificationInfo:(NSDictionary *)message{
NSMutableArray * arr = [self.keyBlockDic valueForKey:self.key];
if (!arr) {
return;
}
for (NotifBlock blcok in arr) {
blcok(message);
}
self.keyBlockDic[self.key] = arr;
}
/* --- 添加和移除 --- */
+ (void)addBlocksObject:(NotifBlock)object WithKey:(NSString *)key{
NotificationCenterBlock * notif = [NotificationCenterBlock shareNotificationCenterBlockWithKey:key];
[notif addBlocksObject:object];
}
+ (void)removeAllBlocksObjectWithKey:(NSString *)key{
NotificationCenterBlock * notif = [NotificationCenterBlock shareNotificationCenterBlockWithKey:key];
[notif removeAllBlocksObject];
}
- (void)addBlocksObject:(__autoreleasing NotifBlock)object{
if (!object) return;
NSMutableArray * arr = [self.keyBlockDic valueForKey:self.key];
if (!arr) {
arr = [NSMutableArray array];
}
[arr addObject:object];
self.keyBlockDic[self.key] = arr;
}
- (void)removeAllBlocksObject{
NSMutableArray * arr = [self.keyBlockDic valueForKey:self.key];
if (arr) {
[arr removeAllObjects];
}
self.keyBlockDic[self.key] = arr;
}
@end
如果有什么地方有漏洞希望大家及时指出，以便及时更改！
