這是一篇AFNetworking的詳細(xì)解析

使用示例

新建一個(gè)AFHTTPSessionManager的manager，然后用manager請求對應(yīng)網(wǎng)址的信息，回調(diào)會(huì)調(diào)用success的completionHander代碼塊。

AFHTTPSessionManager* manager = [AFHTTPSessionManager manager];
[manager GET:@"www.baidu.com" 
parameters:nil 
progress:nil 
success:^(NSURLSessionDataTask * _Nonnull task,
id  _Nullable responseObject) {
        NSLog(responseObject);
    } failure:nil];

AFNetworking流程圖

Paste_Image.png

• 調(diào)用post請求

- (NSURLSessionDataTask *)POST:(NSString *)URLString parameters:(id)parameters 
progress:(void (^)(NSProgress * _Nonnull))uploadProgress 
success:(void (^)(NSURLSessionDataTask * _Nonnull, id _Nullable))success 
failure:(void (^)(NSURLSessionDataTask * _Nullable,
 NSError * _Nonnull))failure

• 新建一個(gè)task

- (NSURLSessionDataTask *)dataTaskWithHTTPMethod:(NSString *)method 
URLString:(NSString *)URLString 
parameters:(id)parameters 
uploadProgress:(nullable void (^)(NSProgress *uploadProgress)) uploadProgress 
downloadProgress:(nullable void (^)(NSProgress *downloadProgress)) 
downloadProgress 
success:(void (^)(NSURLSessionDataTask *, id))success 
failure:(void (^)(NSURLSessionDataTask *, NSError *))failure

• 新建一個(gè)request

- (NSMutableURLRequest *)requestWithMethod:(NSString *)method 
URLString:(NSString *)URLString 
parameters:(id)parameters 
error:(NSError *__autoreleasing *)error

• 新建一個(gè)dataTask

- (NSURLSessionDataTask *)dataTaskWithRequest:(NSURLRequest *)request 
uploadProgress:(nullable void (^)(NSProgress *uploadProgress)) 
uploadProgressBlock downloadProgress:(nullable void (^)(NSProgress *downloadProgress)) 
downloadProgressBlock 
completionHandler:(nullable void (^)(NSURLResponse *response, id _Nullable responseObject
, NSError * _Nullable error))completionHandler

• 添加delegate

- (void)addDelegateForDataTask:(NSURLSessionDataTask *)dataTask 
uploadProgress:(nullable void (^)(NSProgress *uploadProgress)) 
uploadProgressBlock downloadProgress:(nullable void (^)(NSProgress *downloadProgress)) 
downloadProgressBlock 
completionHandler:(void (^)(NSURLResponse *response
, id responseObject, NSError *error))completionHandler

整體架構(gòu)

• AFURLSessionManager的mutableTaskDelegatesKeyedByTaskIdentifier屬性，存放著每一個(gè)task對應(yīng)的AFURLSessionManagerTaskDelegate；
• AFURLSessionManager的NSURLSessionDelegate實(shí)現(xiàn)，會(huì)調(diào)用每個(gè)task對應(yīng)的AFURLSessionManagerTaskDelegate；
• 設(shè)置Task的AFURLSessionManagerTaskDelegate時(shí)，用了NSLock，進(jìn)行多線程同步；
• 任務(wù)的調(diào)度采用了工廠模式、觀察者和代理模式。
  • 工廠模式
    對于HTTP協(xié)議的請求有
    AFHTTPRequestSerializer
    AFJSONRequestSerializer
    AFPropertyListRequestSerializer
    三個(gè)都依賴抽象接口AFURLRequestSerialization
    對于HTTP協(xié)議的響應(yīng)有
    AFHTTPResponseSerializer
    AFJSONResponseSerializer
    AFXMLParserResponseSerializer
    AFXMLDocumentResponseSerializer
    AFPropertyListResponseSerializer
    AFImageResponseSerializer
    AFCompoundResponseSerializer
    都依賴抽象接口 AFURLResponseSerialization
    符合 開放-封閉原則
    對增加新的請求頭、響應(yīng)頭是開放的，而且增加新內(nèi)容不需要修改原內(nèi)容
  • 觀察者模式
    對于task的每個(gè)生命周期，都會(huì)有相應(yīng)的事件發(fā)出
    AFNetworkingTaskDidResumeNotification
    AFNetworkingTaskDidSuspendNotification
    對于task用KVO的方式去監(jiān)聽Progress
  • 代理模式
    AFURLSessionManagerTaskDelegate 是AF對自己的邏輯封裝，同時(shí)實(shí)現(xiàn)了
    NSURLSessionTaskDelegate,
    NSURLSessionDataDelegate
    NSURLSessionDownloadDelegate
    同時(shí)通過實(shí)現(xiàn)NSURLSessionDelegate，來接受session級別的事件。