篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了IOS 开发 网络详解 AFURLSessionManager相关的知识，希望对你有一定的参考价值。
AFURLSessionManager 绝对可以称得上是 AFNetworking 的核心。
负责创建和管理 NSURLSession
管理 NSURLSessionTask
实现 NSURLSessionDelegate 等协议中的代理方法
使用 AFURLSessionManagerTaskDelegate 管理进度
使用 _AFURLSessionTaskSwizzling 调剂方法
引入 AFSecurityPolicy 保证请求的安全
引入 AFNetworkReachabilityManager 监控网络状态
1.创建
在初始化方法中，需要完成初始化一些自己持有的实例：
初始化会话配置（NSURLSessionConfiguration），默认为 defaultSessionConfiguration
初始化会话（session），并设置会话的代理以及代理队列
初始化管理响应序列化（AFJSONResponseSerializer），安全认证（AFSecurityPolicy）以及监控网络状态（AFNetworkReachabilityManager）的实例
初始化保存 data task 的字典（mutableTaskDelegatesKeyedByTaskIdentifier）
- (instancetype)initWithSessionConfiguration:(NSURLSessionConfiguration *)configuration {
self = [super init];
if (!self) {
return nil;
}
if (!configuration) {
configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
}
self.sessionConfiguration = configuration;
self.operationQueue = [[NSOperationQueue alloc] init];
self.operationQueue.maxConcurrentOperationCount = 1;
self.session = [NSURLSession sessionWithConfiguration:self.sessionConfiguration delegate:self delegateQueue:self.operationQueue];
self.responseSerializer = [AFJSONResponseSerializer serializer];
self.securityPolicy = [AFSecurityPolicy defaultPolicy];
self.reachabilityManager = [AFNetworkReachabilityManager sharedManager];
self.mutableTaskDelegatesKeyedByTaskIdentifier = [[NSMutableDictionary alloc] init];
self.lock = [[NSLock alloc] init];
self.lock.name = AFURLSessionManagerLockName;
#1: 为已有的 task 设置代理, 略
return self;
}
2.管理
- (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;
- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request
fromFile:(NSURL *)fileURL
progress:(nullable void (^)(NSProgress *uploadProgress)) uploadProgressBlock
completionHandler:(nullable void (^)(NSURLResponse *response, id _Nullable responseObject, NSError * _Nullable error))completionHandler;
...
- (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request
progress:(nullable void (^)(NSProgress *downloadProgress)) downloadProgressBlock
destination:(nullable NSURL * (^)(NSURL *targetPath, NSURLResponse *response))destination
completionHandler:(nullable void (^)(NSURLResponse *response, NSURL * _Nullable filePath, NSError * _Nullable error))completionHandler;
- (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 {
__block NSURLSessionDataTask *dataTask = nil;
url_session_manager_create_task_safely(^{
dataTask = [self.session dataTaskWithRequest:request];
});
[self addDelegateForDataTask:dataTask uploadProgress:uploadProgressBlock downloadProgress:downloadProgressBlock completionHandler:completionHandler];
return dataTask;
}
调用 - [NSURLSession dataTaskWithRequest:] 方法传入 NSURLRequest
调用 - [AFURLSessionManager addDelegateForDataTask:uploadProgress:downloadProgress:completionHandler:] 方法返回一个 AFURLSessionManagerTaskDelegate 对象
将 completionHandler uploadProgressBlock 和 downloadProgressBlock 传入该对象并在相应事件发生时进行回调
3.实现NSURLSesstion的delegate
- (void)setSessionDidBecomeInvalidBlock:(nullable void (^)(NSURLSession *session, NSError *error))block;
- (void)setSessionDidReceiveAuthenticationChallengeBlock:(nullable NSURLSessionAuthChallengeDisposition (^)(NSURLSession *session, NSURLAuthenticationChallenge *challenge, NSURLCredential * _Nullable __autoreleasing * _Nullable credential))block;
...
- (void)setSessionDidBecomeInvalidBlock:(void (^)(NSURLSession *session, NSError *error))block {
self.sessionDidBecomeInvalid = block;
}