一个 iOS 应用可能集成了大量的服务，远程推送、本地推送、生命周期管理、第三方支付、第三方分享....。有没有觉得你的Appdelegate 太过庞大了，有没有想过将每个服务重Appdelegate中拆分出来单独管理。
AppDelegate 做了太多事
AppDelegate 并不遵循单一功能原则，它要负责处理很多事情，如应用生命周期回调、远程推送、本地推送、应用跳转(HandleOpenURL)；如果集成了第三方服务，大多数还需要在应用启动时初始化，并且需要处理应用跳转，如果在 AppDelegate 中做这些事情，势必让它变得很庞大。
不同服务的代码纠缠在一起，使得 AppDelegate 变得很难复用。而且如果你想要添加一个服务或者关闭一个服务，都需要去修改 AppDelegate。很多服务看起来互相独立，并不依赖其它服务，我们可以把它们拆分出来，放在单独的文件里。
要实现的目标
1.添加或者删除一个服务的时候，不需要更改 AppDelegate 中的任何一行代码。
2.AppDelegate 不实现 UIApplicationDelegate 协议中的方法，由协议去实现
如何实现
下面就看下怎么实现Appdelegate的分成，下面以极光推送第三方为例
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
JPushService 新创建的服务类需要添加 <UIApplicationDelegate> 协议
// JPushService.h
// ALDNews
//
// Created by Allen on 2018/4/24.
// Copyright © 2018年 Aladdin. All rights reserved.
//
//JPush 极光推送服务类 服务类
#import <Foundation/Foundation.h>
#import "NSObject+performSelector.h"
@interface JPushService : NSObject <UIApplicationDelegate>
@end
实现文件 (仅说明原理)
//
// JPushService.m
// ALDNews
//
// Created by Allen on 2018/4/24.
// Copyright © 2018年 Aladdin. All rights reserved.
//
#import "JPushService.h"
// 引入JPush功能所需头文件
#import "JPush/JPushService.h"
#import "HPNewsDetailsController.h"
// iOS10注册APNs所需头文件
#ifdef NSFoundationVersionNumber_iOS_9_x_Max
#import <UserNotifications/UserNotifications.h>
#endif
#import "UUID.h"
@interface JPushService() <JPUSHRegisterDelegate>
@end
@implementation JPushService
{
NSInteger _seq;
}
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
LOG(@"JPushService didFinishLaunchingWithOptions");
[application setApplicationIconBadgeNumber:0];
[application cancelAllLocalNotifications];
//Required
// 初始化
[JPUSHService setupWithOption:launchOptions appKey:[Config getJPushAppkey]
channel:@"App Store"
apsForProduction:[Config returnAPIType] == APITypeOnline?YES:NO
advertisingIdentifier:nil];
return YES;
}
//注册Token
-(void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken{
/// Required - 注册 DeviceToken
[JPUSHService registerDeviceToken:deviceToken];
//设置别名 [UUID getUUID]
NSString * uuidStr = [[UUID getUUID] stringByReplacingOccurrencesOfString:@"-" withString:@""];
[JPUSHService setAlias:uuidStr completion:^(NSInteger iResCode, NSString *iAlias, NSInteger seq) {
_seq = seq;
} seq:_seq];
}
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
// Required, iOS 7 Support
[JPUSHService handleRemoteNotification:userInfo];
completionHandler(UIBackgroundFetchResultNewData);
}
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
// Required,For systems with less than or equal to iOS6
[JPUSHService handleRemoteNotification:userInfo];
}
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
//Optional
LOG(@"did Fail To Register For Remote Notifications With Error: %@", error);
}
//进入后台
- (void)applicationDidEnterBackground:(UIApplication *)application {
[[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
[JPUSHService setBadge:0];
}
@end
二、SOAComponentAppDelegate.m实现
在实现类中，需要引用并注册第三方的服务类。
//
// SOAComponentAppDelegate.h
// ALDNews
//
// Created by Allen on 2018/4/24.
// Copyright © 2018年 Aladdin. All rights reserved.
//
//第三方库 组件类
#import <Foundation/Foundation.h>
@interface SOAComponentAppDelegate : NSObject
+ (instancetype)instance;
- (NSMutableArray *)services;
@end
实现类
//
// SOAComponentAppDelegate.m
// ALDNews
//
// Created by 占益民 on 2018/4/24.
// Copyright © 2018年 Aladdin. All rights reserved.
//
#import "SOAComponentAppDelegate.h"
#import "JPushService.h"
#import "VoiceService.h"
@implementation SOAComponentAppDelegate
{
NSMutableArray * allServices;
}
#pragma mark - 服务静态注册
//根据项目要求 添加相应的服务。现在只添加JPush
- (void)registeServices{
[self registeService:[[JPushService alloc] init]];
[self registeService:[[VoiceService alloc] init]];
}
#pragma mark - 获取SOAComponent 单实例
+ (instancetype)instance{
static SOAComponentAppDelegate * instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[SOAComponentAppDelegate alloc] init];
});
return instance;
}
#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、看下AppDelegate 上需要做哪些操作
1.AppDelegate.h 不需要做任何修改
2.AppDelegate.m 导入头文件SOAComponentAppDelegate 和JPushService
#import "AppDelegate.h"
#import "SOAComponentAppDelegate.h"
#import "JPushService.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。
四、优化
当然这里还可以有优化的地方
id<UIApplicationDelegate> service;
for(service in [[SOAComponentAppDelegate instance] services]){
if ([service respondsToSelector:@selector(applicationWillTerminate:)]){
[service applicationWillTerminate:application];
}
}
项目中很多地方用到了类似这种的代码。我们也可以将这个代码块做个统一的封装。由于时间关系，我并没有做。但是可以提供一点思路
用下面的代码统一上面的代码块
-(void)thirdSDKLifecycleManager:(NSString *)selectorStr withParameters:(NSArray *)params{
SEL selector = NSSelectorFromString(selectorStr);
NSObject <UIApplicationDelegate> *service;
for(service in [[SOAComponentAppDelegate instance] services]){
if ([service respondsToSelector:selector]){
//注意这里的performSelector这个是要自己写分类的（系统不带这个功能的）
[service performSelector:selector withObjects:params];
}
}
}
后面每个生命周期函数只要调用一个方法就可以了，将相应的参数传过去就OK 了
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[self thirdSDKLifecycleManager:@"application:didFinishLaunchingWithOptions:" withParameters:@[application,launchOptions?launchOptions:@""]];
return YES;
}
注意：
[service performSelector:selector withObjects:params];
这个方法是要自己重写NSObject分类的
系统的只能带一个或两个参数
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