组件化思路很多,文章也很多,参考之后选择 casatwy / CTMediator 作为最佳实践
https://github.com/casatwy/CTMediator
一、基础
组件化主要为了解决项目变大,模块变多,相互依赖,工程恶化的问题;
核心思想:
1、模块独立,仅开放部分入口供外部调用
2、使用中间者模式,统一管理模块开放入口
3、中间者运用 runtime 动态创建,切断相互关联,彻底独立模块
4、使用 pod 管理模块库,便捷高效
二、CTMediator
2.1 核心部分
使用 target-action 方式实现对象方法调用
结合 NSClassFromString、NSSelectorFromString 反向实现 Class 和 SEL 的获取
完全切断了中间者对模块的耦合
- 代码部分做了简单的修改
- (id)performTarget:(NSString *)targetName action:(NSString *)actionName params:(NSDictionary *)params shouldCacheTarget:(BOOL)shouldCacheTarget
{
NSString *swiftModuleName = params[kCTMediatorParamsKeySwiftTargetModuleName];
// 通用对象获取
NSString *targetClassString = nil;
if (swiftModuleName.length > 0) {
targetClassString = [NSString stringWithFormat:@"%@.Target_%@", swiftModuleName, targetName];
} else {
targetClassString = [NSString stringWithFormat:@"Target_%@", targetName];
}
// 取缓存的对象
NSObject *target = self.cachedTarget[targetClassString];
if (target == nil) {
Class targetClass = NSClassFromString(targetClassString);
target = [[targetClass alloc] init];
}
// 通用方法获取, Action 的 ‘:’ 在外部手动添加,这样可以支持 无参数方法
NSString *actionString = [NSString stringWithFormat:@"Action_%@", actionName];
SEL action = NSSelectorFromString(actionString);
if (target == nil) {
// 对象不存在,转向 Target_Base 的 Action_NotFoundTarget: 统一处理
return [self performNoTargetResponseWithTargetString:targetClassString selectorString:actionString originParams:params];
}
// 按需缓存对象
if (shouldCacheTarget) {
self.cachedTarget[targetClassString] = target;
}
if ([target respondsToSelector:action]) {
// 正常情况,对象执行方法
return [self safePerformAction:action target:target params:params];
} else {
// 方法不存在,转向 target 的 Action_NotFoundAction: 统一处理
SEL action = NSSelectorFromString(@"Action_NotFoundAction:");
if ([target respondsToSelector:action]) {
return [self performNoActionResponseWithTargetString:targetClassString selectorString:actionString originParams:params];
} else {
// 转向 Target_Base 的 Action_NotFoundActionFinal: 统一处理
[self.cachedTarget removeObjectForKey:targetClassString];
return [self performNotFoundFinalResponseWithTargetString:targetClassString selectorString:actionString originParams:params];
}
}
}
2.2 本地调用简单实践
- 模块开放接口
#import "Target_Order.h"
#import "CZOrderRootController.h"
#import "CZOrderDetailController.h"
@implementation Target_Order
- (UIViewController *)Action_OrderRootController {
CZOrderRootController *viewController = [[CZOrderRootController alloc] init];
return viewController;
}
- (UIViewController *)Action_OrderDetailControllerWithParams:(NSDictionary *)params {
NSString *aid = params[@"id"];
CZOrderDetailController *viewController = [[CZOrderDetailController alloc] initWithOrderId:aid];
return viewController;
}
@end
- 中间者拓展
// 注意不需要 引用 Target_Order,中间者不依赖模块,但是需要维护相关的 模块名称与方法
#import "CTMediator+CZOrderMediator.h"
@implementation CTMediator (CZOrderMediator)
- (UIViewController *)orderRootController {
UIViewController *viewController = [self performTarget:@"Order"
action:@"OrderRootController"
params:@{}
shouldCacheTarget:NO
];
return viewController;
}
- (UIViewController *)orderDetailControllerWithOrderId:(NSString *)orderId {
UIViewController *viewController = [self performTarget:@"Order"
action:@"OrderDetailControllerWithParams:"
params:@{@"id":orderId}
shouldCacheTarget:NO
];
return viewController;
}
@end
- 使用中间者,调用模块
// 引入中间者,不引入对应模块
#import "CTMediator+CZOrderMediator.h"
UIViewController *controller = [[CTMediator sharedInstance] orderRootController];
UIViewController *controller = [[CTMediator sharedInstance] orderDetailControllerWithOrderId:@"123"];
[self.navigationController pushViewController:controller animated:YES];
2.3 远程调用简单实践
远程调用本质,是在本地调用基础上,处理远程 URL,解析成可用的本地调用
- 核心部分,补充了合法远程调用的检查
- (id)performActionWithUrl:(NSURL *)url completion:(void (^)(NSDictionary *))completion
{
// 解析 URL
NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
NSString *urlString = [url query];
NSString *targetString = url.host;
NSString *actionName = [url.path stringByReplacingOccurrencesOfString:@"/" withString:@""];
NSString *actionLocalKey = [NSString stringWithFormat:@"%@_%@", targetString, actionName];
NSString *actionString = [[Action_RemoteConfig sharedInstance] actions][actionLocalKey];
for (NSString *param in [urlString componentsSeparatedByString:@"&"]) {
NSArray *elts = [param componentsSeparatedByString:@"="];
if([elts count] < 2) continue;
[params setObject:[elts lastObject] forKey:[elts firstObject]];
}
id result;
if (!actionString || ![actionString isKindOfClass:[NSString class]]) {
// 非法远程调用
result = [self performNotFoundFinalResponseWithTargetString:targetString selectorString:actionName originParams:params];
} else {
// 修正 actionString,处理远程调用
result = [self performTarget:url.host action:actionString params:params shouldCacheTarget:NO];
}
if (completion) {
if (result) {
completion(@{@"result":result});
} else {
completion(nil);
}
}
return result;
}
- 使用与本地调用类似
UIViewController *controller = [[CTMediator sharedInstance] performActionWithUrl:[NSURL URLWithString:@"cz://Order/OPEN_API/OrderDetailControllerWithParams:?id=123"] completion:^(NSDictionary *info) {
}];
[self.navigationController pushViewController:controller animated:YES];
三、整理
业务模块:需要整理出一份统一的开发接口,供外部调用
中间者:可以独立成一个模块单独维护,统一处理开放接口
基础模块:各种组件、网络、拓展等
开发时各个模块独立,单独运行,减少无关编译,提高效率
整合时,使用 pod 升级,完整编译