前言

在iOS開發(fā)中我們回調(diào)經(jīng)常使用delegete、blcok、通知等方式碘箍。delegete和blcok都是“一對一”回調(diào)辽慕，通知可實(shí)現(xiàn)“一對多”回調(diào)京腥。但是通知有兩個(gè)明顯的弊端：1、不好管理 2溅蛉、傳值只能在userInfo中公浪，這就會(huì)導(dǎo)致傳值類型不明確等問題他宛。
有什么方式即可以“一對多”回調(diào)，又可以明確回調(diào)參數(shù)類型呢欠气！答案是有的厅各，就是我們今天介紹的GCDMulticastDelegate

1、GCDMulticastDelegate介紹

GitHub上的介紹：GCDMulticastDelegate extracted from XMPPFramework预柒。
GCDMulticastDelegate是從XMPPFramework提取出來的队塘，主要就是為了實(shí)現(xiàn)多播委托。

2宜鸯、GCDMulticastDelegate導(dǎo)入

pod 'GCDMulticastDelegate'

但是如果我們項(xiàng)目中已經(jīng)pod 'XMPPFramework'就無需單獨(dú)pod 'GCDMulticastDelegate'了憔古。因?yàn)閄MPPFramework里面包含了GCDMulticastDelegate。

3淋袖、GCDMulticastDelegate使用

3.1鸿市、.h文件中

#import <Foundation/Foundation.h>
#import <GCDMulticastDelegate.h>

@protocol HLManagerDelegate<NSObject>
- (void)managerTestMethod;
@end
 
@interface HLManager : NSObject
{
    GCDMulticastDelegate<HLManagerDelegate> *_delegates;
}
+ (instancetype)sharedManager;
 
/// 添加代理
- (void)addDelegate:(id<HLManagerDelegate>)delegate delegateQueue:(dispatch_queue_t)queue;
/// 刪除代理
- (void)removeDelegate:(id<HLManagerDelegate>)delegate;
@end

3.2、.m文件中

#import "HLManager.h"
 
static HLManager *manager = nil;
static NSObject *g_lock = nil;
@implementation HLManager
 
+ (instancetype)sharedManager
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        manager = [[HLManager alloc] init];
    });
    return manager;
}
 
- (instancetype)init
{
    self = [super init];
    if (self) {
        _delegates = (GCDMulticastDelegate<HLManagerDelegate> *)[[GCDMulticastDelegate alloc] init];
        g_lock = [[NSObject alloc] init];
    }
    return self;
}

#pragma mark - Public Method
 
- (void)addDelegate:(id<HLManagerDelegate>)delegate delegateQueue:(dispatch_queue_t)queue
{
    @synchronized(g_lock) {
        if (!queue) {
            queue = dispatch_get_main_queue();
        }
        [_delegates addDelegate:delegate delegateQueue:queue];
    }
}
- (void)removeDelegate:(id<HLManagerDelegate>)delegate
{
    if (!delegate) {
        return;
    }
    @synchronized(g_lock) {
        [_delegates removeDelegate:delegate];
    }
}
@end

3.3即碗、其他類使用HLManagerDelegate

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [[HLManager sharedManager] addDelegate:self delegateQueue:dispatch_get_main_queue()];
}

- (void)dealloc {
    [[HLManager sharedManager] removeDelegate:self];
}
 
#pragma mark - HLManagerDelegate
 
- (void)managerTestMethod
{
    NSLog("調(diào)用了managerTestMethod方法");
}

4焰情、總結(jié)

上面簡單演示了GCDMulticastDelegate簡單使用。希望對您有幫助拜姿！

參考：
GCDMulticastDelegate使用