我当前能力对AF的理解-AFURLSessionManager.h，写给我自己

@interface AFURLSessionManager : NSObject <NSURLSessionDelegate, NSURLSessionTaskDelegate, NSURLSessionDataDelegate, NSURLSessionDownloadDelegate, NSSecureCoding, NSCopying>

1.AFURLSessionManager的定义，和实现的协议

　　1.1 NSURLSessionDelegate--网络请求的 

　　1.2NSURLSessionTaskDelegate -- 请求任务的

　　1.3NSURLSessionDataDelegate -- 请求数据的

　　1.4NSURLSessionDownloadDelegate -- 下载请求的

　　1.5NSSecureCoding -- 请求证书

@property (readonly, nonatomic, strong) NSURLSession *session;

　管理请求用的

/**
 The operation queue on which delegate callbacks are run.
　　代理回调时候，delegate所在的操作队列
 */
@property (readonly, nonatomic, strong) NSOperationQueue *operationQueue;

　

@property (nonatomic, strong) id <AFURLResponseSerialization> responseSerializer;

　　猜测：对请求回来的数据进行序列化。

@property (nonatomic, strong) AFSecurityPolicy *securityPolicy;

　　请求证书配置

@property (readwrite, nonatomic, strong) AFNetworkReachabilityManager *reachabilityManager;

　　猜测：判断有网没网

/**
 The data, upload, and download tasks currently run by the managed session.
 */
@property (readonly, nonatomic, strong) NSArray <NSURLSessionTask *> *tasks;

/**
 The data tasks currently run by the managed session.
 */
@property (readonly, nonatomic, strong) NSArray <NSURLSessionDataTask *> *dataTasks;

/**
 The upload tasks currently run by the managed session.
 */
@property (readonly, nonatomic, strong) NSArray <NSURLSessionUploadTask *> *uploadTasks;

/**
 The download tasks currently run by the managed session.
 */
@property (readonly, nonatomic, strong) NSArray <NSURLSessionDownloadTask *> *downloadTasks;

　　猜测：请求任务的数组，数据数组，上传任务，下载任务数组。

/**
 The dispatch queue for `completionBlock`. If `NULL` (default), the main queue is used.
 */
@property (nonatomic, strong, nullable) dispatch_queue_t completionQueue;

/**
 The dispatch group for `completionBlock`. If `NULL` (default), a private dispatch group is used.
 */
@property (nonatomic, strong, nullable) dispatch_group_t completionGroup;

　　完成时候的队列，队列组