一、蘑菇街url-block方案
这是蘑菇街中应用的一种页面间调用的方式，通过在启动时注册组件提供的服务，把调用组件使用的url和组件提供的服务block对应起来，保存到内存中。在使用组件的服务时，通过url找到对应的block，然后获取服务。
具体实现代码如下：
//Mediator.m 中间件
@implementation Mediator
typedef void (^componentBlock) (id param);
@property (nonatomic, storng) NSMutableDictionary *cache
- (void)registerURLPattern:(NSString *)urlPattern toHandler:(componentBlock)blk {
[cache setObject:blk forKey:urlPattern];
}
- (void)openURL:(NSString *)url withParam:(id)param {
componentBlock blk = [cache objectForKey:url];
if (blk) blk(param);
}
@end
1.先在Mediator中注册url-block
#import "Mediator.h"
#import "WRBookDetailViewController.h"
+ (void)initComponent {
[[Mediator sharedInstance] registerURLPattern:@"weread://bookDetail" toHandler:^(NSDictionary *param) {
WRBookDetailViewController *detailVC = [[WRBookDetailViewController alloc] initWithBookId:param[@"bookId"]];
[[UIApplication sharedApplication].keyWindow.rootViewController.navigationController pushViewController:detailVC animated:YES];
}];
}
2.通过url在中间件中就能找到对应的block，并执行跳转
#import "Mediator.h"
+ (void)gotoDetail:(NSString *)bookId {
[[Mediator sharedInstance] openURL:@"weread://bookDetail" withParam:@{@"bookId": bookId}];
}
二、 蘑菇街protocol-class方案
针对url-block方案无法传递非正规参数，新增一种protocol-class方案
//ProtocolMediator.m 中间件
@implementation ProtocolMediator
@property (nonatomic, storng) NSMutableDictionary *protocolCache
- (void)registerProtocol:(Protocol *)proto forClass:(Class)cls {
NSMutableDictionary *protocolCache;
[protocolCache setObject:cls forKey:NSStringFromProtocol(proto)];
}
- (Class)classForProtocol:(Protocol *)proto {
return protocolCache[NSStringFromProtocol(proto)];
}
@end
每一个组件都有一个公共Protocol文件，定义了每一个组件对外提供的接口
//ComponentProtocol.h
@protocol BookDetailComponentProtocol <NSObject>
- (UIViewController *)bookDetailController:(NSString *)bookId;
- (UIImage *)coverImageWithBookId:(NSString *)bookId;
@end
@protocol ReviewComponentProtocol <NSObject>
- (UIViewController *)ReviewController:(NSString *)bookId;
@end
//BookDetailComponent 组件
#import "ProtocolMediator.h"
#import "ComponentProtocol.h"
#import "WRBookDetailViewController.h"
+ (void)initComponent{
[[ProtocolMediator sharedInstance] registerProtocol:@protocol(BookDetailComponentProtocol) forClass:[self class];
}
- (UIViewController *)bookDetailController:(NSString *)bookId {
WRBookDetailViewController *detailVC = [[WRBookDetailViewController alloc] initWithBookId:param[@"bookId"]];
return detailVC;
}
- (UIImage *)coverImageWithBookId:(NSString *)bookId {
….
}
最后调用者通过 protocol 从 ProtocolMediator 拿到提供这些方法的 Class，再进行调用：
//WRReadingViewController.m 调用者
//ReadingViewController.m
#import "ProtocolMediator.h"
#import "ComponentProtocol.h"
+ (void)gotoDetail:(NSString *)bookId {
Class cls = [[ProtocolMediator sharedInstance] classForProtocol:BookDetailComponentProtocol];
id bookDetailComponent = [[cls alloc] init];
UIViewController *vc = [bookDetailComponent bookDetailController:bookId];
[self.navigationController pushViewController:vc animated:YES];
}
三、target-action方案
1.先设置一个中间件公共类
@interface CTMediator : NSObject
+ (instancetype)sharedInstance;
// 远程App调用入口
- (id)performActionWithUrl:(NSURL *)url completion:(void(^)(NSDictionary *info))completion;
// 本地组件调用入口
- (id)performTarget:(NSString *)targetName action:(NSString *)actionName params:(NSDictionary *)params shouldCacheTarget:(BOOL)shouldCacheTarget;
- (void)releaseCachedTargetWithTargetName:(NSString *)targetName;
@end
//
// CTMediator.m
// CTMediator
//
// Created by casa on 16/3/13.
// Copyright © 2016年 casa. All rights reserved.
//
#import "CTMediator.h"
@interface CTMediator ()
@property (nonatomic, strong) NSMutableDictionary *cachedTarget;
@end
@implementation CTMediator
#pragma mark - public methods
+ (instancetype)sharedInstance
{
static CTMediator *mediator;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
mediator = [[CTMediator alloc] init];
});
return mediator;
}
/*
scheme://[target]/[action]?[params]
url sample:
aaa://targetA/actionB?id=1234
*/
- (id)performActionWithUrl:(NSURL *)url completion:(void (^)(NSDictionary *))completion
{
NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
NSString *urlString = [url query];
for (NSString *param in [urlString componentsSeparatedByString:@"&"]) {
NSArray *elts = [param componentsSeparatedByString:@"="];
if([elts count] < 2) continue;
[params setObject:[elts lastObject] forKey:[elts firstObject]];
}
// 这里这么写主要是出于安全考虑，防止黑客通过远程方式调用本地模块。这里的做法足以应对绝大多数场景，如果要求更加严苛，也可以做更加复杂的安全逻辑。
NSString *actionName = [url.path stringByReplacingOccurrencesOfString:@"/" withString:@""];
if ([actionName hasPrefix:@"native"]) {
return @(NO);
}
// 这个demo针对URL的路由处理非常简单，就只是取对应的target名字和method名字，但这已经足以应对绝大部份需求。如果需要拓展，可以在这个方法调用之前加入完整的路由逻辑
id result = [self performTarget:url.host action:actionName params:params shouldCacheTarget:NO];
if (completion) {
if (result) {
completion(@{@"result":result});
} else {
completion(nil);
}
}
return result;
}
- (id)performTarget:(NSString *)targetName action:(NSString *)actionName params:(NSDictionary *)params shouldCacheTarget:(BOOL)shouldCacheTarget
{
NSString *targetClassString = [NSString stringWithFormat:@"Target_%@", targetName];
NSString *actionString = [NSString stringWithFormat:@"Action_%@:", actionName];
id target = self.cachedTarget[targetClassString];
if (target == nil) {
Class targetClass = NSClassFromString(targetClassString);
target = [[targetClass alloc] init];
}
SEL action = NSSelectorFromString(actionString);
if (target == nil) {
// 这里是处理无响应请求的地方之一，这个demo做得比较简单，如果没有可以响应的target，就直接return了。实际开发过程中是可以事先给一个固定的target专门用于在这个时候顶上，然后处理这种请求的
return nil;
}
if (shouldCacheTarget) {
self.cachedTarget[targetClassString] = target;
}
if ([target respondsToSelector:action]) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
return [target performSelector:action withObject:params];
#pragma clang diagnostic pop
} else {
// 这里是处理无响应请求的地方，如果无响应，则尝试调用对应target的notFound方法统一处理
SEL action = NSSelectorFromString(@"notFound:");
if ([target respondsToSelector:action]) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
return [target performSelector:action withObject:params];
#pragma clang diagnostic pop
} else {
// 这里也是处理无响应请求的地方，在notFound都没有的时候，这个demo是直接return了。实际开发过程中，可以用前面提到的固定的target顶上的。
[self.cachedTarget removeObjectForKey:targetClassString];
return nil;
}
}
}
- (void)releaseCachedTargetWithTargetName:(NSString *)targetName
{
NSString *targetClassString = [NSString stringWithFormat:@"Target_%@", targetName];
[self.cachedTarget removeObjectForKey:targetClassString];
}
#pragma mark - getters and setters
- (NSMutableDictionary *)cachedTarget
{
if (_cachedTarget == nil) {
_cachedTarget = [[NSMutableDictionary alloc] init];
}
return _cachedTarget;
}
@end
2.每个组件创建一个Category，在其中实现当前组件的跳转实现
#import <CTMediator/CTMediator.h>
#import <UIKit/UIKit.h>
@interface CTMediator (TAConfirmOrder)
- (UIViewController *)confirmOrderViewControllerWithGoodsId:(NSString *)goodsId goodsName:(NSString *)goodsName ConfirmComplete:(dispatch_block_t)confirmComplete;
@end
#import "CTMediator+TAConfirmOrder.h"
@implementation CTMediator (TAConfirmOrder)
- (UIViewController *)confirmOrderViewControllerWithGoodsId:(NSString *)goodsId goodsName:(NSString *)goodsName ConfirmComplete:(dispatch_block_t)confirmComplete
{
NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
params[@"goodsId"] = goodsId;
params[@"goodsName"] = goodsName;
params[@"completeBlock"] = confirmComplete;
return [self performTarget:@"TAConfirmOrder" action:@"ConfirmOrderViewController" params:params shouldCacheTarget:NO];
}
@end
3.通过中间件调用
UIViewController *confirmOrderVC = [[CTMediator sharedInstance] confirmOrderViewControllerWithGoodsId:self.goodsId goodsName:self.goodsName ConfirmComplete:^{
//...
}];