网络请求库的代码迁移

今天刚上班,群里不停有人发这东西:



不过估计到时候不进行代码迁移的话估计就不能兼容IPV6-only标准了,然后就不能上架appstore.可怜我还在用着NSURLConnection的废弃api,没办法了,只能迁移了,可是有不少同学可能跟我处于一个比较尴尬的境地,如果我们只是单纯的自己对AF进行封装,只要升级AF到3.0以上,就可以满足苹果的要求了,但是如果我们用来一些对AF二次封装的框架,就显得比较麻烦了,例如有的同学会用唐巧的猿题库网络框架,这些框架都是没有迁移到AF3.0的,这篇文章,我会以一个GJNetWorking的库讲解一下我的迁移经历.

我们来对比一下2.x和3.x都发生了什么变化:



AF2.x



AF3.x

由此可见:被苹果官方废弃的NSURLConnection已经被AF删掉了.所以我们应该面向AFHTTPSessionManager编程 而非AFHTTPRequestOperationManager.

介绍一下GJNetWorking,当时使用它来进行项目开发 主要是因为代码比较简洁,支持网络缓存,支持mjestension和mantle的模型映射.我们进行升级AF,主要是对GJHTTPManager GJBaseRequest GJModelRequest这几个类进行代码修改.在GJHTTPManager中使用AFHTTPSessionManager替换掉原来的AFHTTPRequestOperationManager

//原来的AFHTTPRequestOperationManager
AFHTTPRequestOperation *startOperation = nil;

switch (method) {
case GJRequestGET:
{
startOperation = [self.manager GET:url
parameters:parameters
success:^(AFHTTPRequestOperation *operation, id responseObject) {
[self requestFinishedWithOperation:operation request:request];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[self requestFinishedWithOperation:operation request:request];
}];
}
break;

//修改后的的AFHTTPSessionManager

NSURLSessionDataTask *startOperation = nil;

switch (method) {
case GJRequestGET:
{

startOperation = [self.manager GET:url parameters:parameters success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
[self requestFinishedWithOperation:task request:request resonseObj:responseObject];

} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
[self requestFinishedWithOperation:task request:request resonseObj:nil];

}];

}
break;

不过比较难的是响应数据的处理,由于在2.0时代作者使用AFHTTPRequestOperation作为返回的结果处理缓存 和模型映射,3.0中这已经被删除了,所以我们只能换一种思路:直接处理从AFHTTPSessionManager

- (NSURLSessionDataTask *)GET:(NSString *)URLString
parameters:(id)parameters
success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

方法中返回的responseObject.

GJBaseRequest中增加方法实现

- (void)requestCompletedWithModel:(id)model;

GJModelRequest中修改方法实现

- (void)requestCompletedWithObj:(id)obj andModelObjBlock:(void (^)(id model))modelBlock{

[super requestCompletedWithObj:obj andModelObjBlock:modelBlock];

BOOL success = !self.error;

id responseStatus;
id responseObject = obj;

//if request success and request implement modelClass,
//when request or default modelMaker implement the delegate ,
//the response object will be make to model or model list.
if (success && [self respondsToSelector:@selector(modelClass)]){
Class defaultModelMaker = [GJNetworkingConfig modelMaker];
Class modelMaker = nil;
if (self && [[self class] respondsToSelector:@selector(makeModelWithJSON:class:status:)] &&
[[self class] conformsToProtocol:@protocol(GJModelMakerDelegate)]) {
modelMaker = [self class];
}
else if (defaultModelMaker && [defaultModelMaker respondsToSelector:@selector(makeModelWithJSON:class:status:)] &&
[defaultModelMaker conformsToProtocol:@protocol(GJModelMakerDelegate)]){
modelMaker = defaultModelMaker;
}

if (modelMaker) {
id model = [modelMaker makeModelWithJSON:responseObject
class:[self modelClass]
status:&responseStatus];

modelBlock(model);
self.status = responseStatus;
}

}

}