名称解释一下：

1、SOA是面向服务的架构，所有的第三方功能都被分别封装成服务。

2、Component 表示这个类是用于引用的，不能用于继承。

一、首先创建服务类，服务类是对第三方服务的封装。第三方服务包括推送、支付、统计等

1、服务举例 BaiduPushService 头文件

新创建的服务类需要添加 协议，根据需要实现协议中的方法。这里只添加了一个作为演示。

//  
//  BaiduPushService.h  
//  SOAComponentAppDelegate  
//  Version 1.0.0  
//  Created by David Wang on 16/3/12.  
//  Copyright © 2016年 teamlet. All rights reserved.  
//  


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

@interface BaiduPushService : NSObject  <UIApplicationDelegate>  

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions ;  

@end  

2、实现类

//  
//  BaiduPushService.m  
//  SOAComponentAppDelegate  
//  <span style="font-family: Arial, Helvetica, sans-serif;">Version 1.0.0</span>  
//  Created by David Wang on 16/3/12.  
//  Copyright © 2016年 teamlet. All rights reserved.  
//  

#import "BaiduPushService.h"  

@implementation BaiduPushService  


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions  
{  
    NSLog(@"BaiduPushService didFinishLaunchingWithOptions");  
    return YES;  
}  
@end  

二、组件类

1、 SOAComponentAppDelegate.h 头文件

定义单例方法instance()和获取服务的方法services。

//  
//  SOAComponentAppDelegate.h  
//  SOAComponentAppDelegate  
//  Version 1.0.0  
//  Created by David Wang on 16/3/12.  
//  Copyright © 2016年 teamlet. All rights reserved.  
//  

#import <Foundation/Foundation.h>  

@interface SOAComponentAppDelegate : NSObject  



+ (instancetype)instance ;  

-(NSMutableArray*) services;  

@end  

2、SOAComponentAppDelegate.m实现

在实现类中，需要引用并注册第三方的服务类。

//  
//  SOAComponentAppDelegate.m  
//  SOAComponentAppDelegate  
//  Version 1.0.0  
//  Created by David Wang on 16/3/12.  
//  Copyright © 2016年 teamlet. All rights reserved.  
//  

#import "SOAComponentAppDelegate.h"  
#import "BaiduPushService.h"  

@implementation SOAComponentAppDelegate  
{  
    NSMutableArray* allServices;  
}  

#pragma mark - 服务静态注册  

//需要运行程序之前，手工增加根据需要的新服务  

-(void)registeServices  
{  
    [self registeService:[[BaiduPushService alloc] init]];  

}  

#pragma mark - 获取SOAComponent单实例  

+ (instancetype)instance {  

    static SOAComponentAppDelegate *insance = nil;  
    static dispatch_once_t once;  
    dispatch_once(&once, ^{  
        insance = [[SOAComponentAppDelegate alloc] init];  
    });  


    return insance;  
}  

#pragma mark - 获取全部服务  

-(NSMutableArray *)services  
{  

    if (!allServices) {  
        allServices = [[NSMutableArray alloc]init];  
        [self registeServices];  
    }  

    return allServices;  
}  

#pragma mark - 服务动态注册  

-(void)registeService:(id)service  
{  
    if (![allServices containsObject:service])  
    {  
        [allServices addObject:service];  
    }  

}  

@end  

三、使用

1、AppDelegate.h 不做任何改动。

//  
//  AppDelegate.h  
//  SOAComponentAppDelegate  
//  Version 1.0.0  
//  Created by David Wang on 16/3/12.  
//  Copyright © 2016年 teamlet. All rights reserved.  
//  

#import <UIKit/UIKit.h>  

@interface AppDelegate : UIResponder <UIApplicationDelegate>  

@property (strong, nonatomic) UIWindow *window;  


@end  

2、AppDelegate.m

导入 SOAComponentAppDelegate 和 BaiduPushService

在对应的方法里调用第三方服务中已经封装好的方法。

//  
//  AppDelegate.m  
//  SOAComponentAppDelegate  
//  Version 1.0.1 补全方法  
//  Created by David Wang on 16/3/12.  
//  Copyright © 2016年 teamlet. All rights reserved.  
//  

#import "AppDelegate.h"  
#import "SOAComponentAppDelegate.h"  
#import "BaiduPushService.h"  

@interface AppDelegate ()  

@end  

@implementation AppDelegate  


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  

    id<UIApplicationDelegate> service;  
    for(service in [[SOAComponentAppDelegate instance] services]){  
        if ([service respondsToSelector:@selector(application:didFinishLaunchingWithOptions:)]){  
            [service application:application didFinishLaunchingWithOptions:launchOptions];  
        }  
    }  

    return YES;  
}  

- (void)applicationWillResignActive:(UIApplication *)application {  
    id<UIApplicationDelegate> service;  
    for(service in [[SOAComponentAppDelegate instance] services]){  
        if ([service respondsToSelector:@selector(applicationWillResignActive:)]){  
            [service applicationWillResignActive:application];  
        }  
    }  
}  

- (void)applicationDidEnterBackground:(UIApplication *)application {  
    id<UIApplicationDelegate> service;  
    for(service in [[SOAComponentAppDelegate instance] services]){  
        if ([service respondsToSelector:@selector(applicationDidEnterBackground:)]){  
            [service applicationDidEnterBackground:application];  
        }  
    }  
}  

- (void)applicationWillEnterForeground:(UIApplication *)application {  
    id<UIApplicationDelegate> service;  
    for(service in [[SOAComponentAppDelegate instance] services]){  
        if ([service respondsToSelector:@selector(applicationWillEnterForeground:)]){  
            [service applicationWillEnterForeground:application];  
        }  
    }  
}  

- (void)applicationDidBecomeActive:(UIApplication *)application {  
    id<UIApplicationDelegate> service;  
    for(service in [[SOAComponentAppDelegate instance] services]){  
        if ([service respondsToSelector:@selector(applicationDidBecomeActive:)]){  
            [service applicationDidBecomeActive:application];  
        }  
    }  
}  

- (void)applicationWillTerminate:(UIApplication *)application {  
    id<UIApplicationDelegate> service;  
    for(service in [[SOAComponentAppDelegate instance] services]){  
        if ([service respondsToSelector:@selector(applicationWillTerminate:)]){  
            [service applicationWillTerminate:application];  
        }  
    }  
}  

@end  

这样就可以完全独立的处理每个不同的第三方服务。