ASI基于CFNetwork框架开发，而AFN基于NSURL.

ASI更底层，请求使用创建CFHTTPMessageRef进行，使用NSOperationQueue进行管理，ASIHTTPRequest就是NSOpration的子类，并实现了NSCopy协议。使用static NSOperationQueue *sharedQueue， 在ASIHTTPRequest执行网络请求时把自己加进去queue。

AFN基于NSURL，请求使用NSURLRequest作为参数传入NSURlconnection进行。使用NSOperationQueue进行管理，通过初始化AFHTTPRquestOperationManager进行多线程管理。

更多可以参考 对比IOS网络组件

2.优缺点对比

选自: AFNetworking、MKNetworkKit和ASIHTTPRequest对比

ASI开发者已于2012年10月宣布暂停该开源库的更新.

AFN的活跃维护者比较多。

3.使用

1.ASI的大概实现

ASIHTTPRequest是NSOperation的子类。 在ASIHTTPRequest有个初始方法：

- (id)initWithURL:(NSURL *)newURL

{

    self = [self init];

    [self setRequestMethod:@"GET"];

    [self setRunLoopMode:NSDefaultRunLoopMode];

    [self setShouldAttemptPersistentConnection:YES];

    [self setPersistentConnectionTimeoutSeconds:60.0];

    [self setShouldPresentCredentialsBeforeChallenge:YES];

    [self setShouldRedirect:YES];

    [self setShowAccurateProgress:YES];

    [self setShouldResetDownloadProgress:YES];

    [self setShouldResetUploadProgress:YES];

    [self setAllowCompressedResponse:YES];

    [self setShouldWaitToInflateCompressedResponses:YES];

    [self setDefaultResponseEncoding:NSISOLatin1StringEncoding];

    [self setShouldPresentProxyAuthenticationDialog:YES];

    [self setTimeOutSeconds:[ASIHTTPRequest defaultTimeOutSeconds]];

    [self setUseSessionPersistence:YES];

    [self setUseCookiePersistence:YES];

    [self setValidatesSecureCertificate:YES];

    [self setRequestCookies:[[[NSMutableArray alloc] init] autorelease]];

    [self setDidStartSelector:@selector(requestStarted:)];

    [self setDidReceiveResponseHeadersSelector:@selector(request:didReceiveResponseHeaders:)];

    [self setWillRedirectSelector:@selector(request:willRedirectToURL:)];

    [self setDidFinishSelector:@selector(requestFinished:)];

    [self setDidFailSelector:@selector(requestFailed:)];

    [self setDidReceiveDataSelector:@selector(request:didReceiveData:)];

    [self setURL:newURL];

    [self setCancelledLock:[[[NSRecursiveLock alloc] init] autorelease]];

    [self setDownloadCache:[[self class] defaultCache]];

    return self;

}

然后在执行异步网络访问时，把自己扔进shareQueue进行管理。

- (void)startAsynchronous

{

#if DEBUG_REQUEST_STATUS || DEBUG_THROTTLING

    ASI_DEBUG_LOG(@"[STATUS] Starting asynchronous request %@",self);

#endif

    [sharedQueue addOperation:self];

}

执行同步访问时更直接。注意[self main]. main方法里面执行了CFNetwork的操作。

- (void)startSynchronous

{

#if DEBUG_REQUEST_STATUS || DEBUG_THROTTLING

    ASI_DEBUG_LOG(@"[STATUS] Starting synchronous request %@",self);

#endif

    [self setSynchronous:YES];

    [self setRunLoopMode:ASIHTTPRequestRunLoopMode];

    [self setInProgress:YES];

    if (![self isCancelled] && ![self complete]) {

        [self main];

        while (!complete) {

            [[NSRunLoop currentRunLoop] runMode:[self runLoopMode] beforeDate:[NSDate distantFuture]];

        }

    }

    [self setInProgress:NO];

}

2.ASI基本使用

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"XXXXX"]];

[request setDelegate:self];   //ASIHTTPRequestDelegate

[request startAsynchronous];

不用进行很多配置，是因为ASIHTTPRequest的requestWithURL方法有默认配置，可以在实例化后自己再修改。如下(还有更多的自己阅读源码)：

[self setRequestMethod:@"GET"];   //访问方法

[self setRunLoopMode:NSDefaultRunLoopMode];   //默认runloop

[self setShouldAttemptPersistentConnection:YES];   //设置持久连接,重用request时用节约

[self setPersistentConnectionTimeoutSeconds:60.0];

[self setShouldPresentCredentialsBeforeChallenge:YES];  //是否要证书验证

[self setShouldRedirect:YES];

[self setShowAccurateProgress:YES];   //进度

[self setShouldResetDownloadProgress:YES];

[self setShouldResetUploadProgress:YES];

[self setAllowCompressedResponse:YES];

[self setShouldWaitToInflateCompressedResponses:YES];

[self setDefaultResponseEncoding:NSISOLatin1StringEncoding];

[self setShouldPresentProxyAuthenticationDialog:YES];

[self setTimeOutSeconds:[ASIHTTPRequest defaultTimeOutSeconds]];   //请求的网络等待时长

[self setUseSessionPersistence:YES];    //保持session

[self setUseCookiePersistence:YES];     //保持cookie

[self setValidatesSecureCertificate:YES];

[self setRequestCookies:[[[NSMutableArray alloc] init] autorelease]];

[self setDidStartSelector:@selector(requestStarted:)];   //请求开始

[self setDidReceiveResponseHeadersSelector:@selector(request:didReceiveResponseHeaders:)];        //获取到ResponseHeader

[self setWillRedirectSelector:@selector(request:willRedirectToURL:)];

[self setDidFinishSelector:@selector(requestFinished:)];    //请求完成

[self setDidFailSelector:@selector(requestFailed:)];      //请求失败

[self setDidReceiveDataSelector:@selector(request:didReceiveData:)];   //获取到data，多次

[self setURL:newURL];      //设置URL

[self setCancelledLock:[[[NSRecursiveLock alloc] init] autorelease]];

[self setDownloadCache:[[self class] defaultCache]];

ASIHTTPRequestDelegate的代理：

- (void)requestStarted:(ASIHTTPRequest *)request;

- (void)request:(ASIHTTPRequest *)request didReceiveResponseHeaders:(NSDictionary *)responseHeaders;

- (void)request:(ASIHTTPRequest *)request willRedirectToURL:(NSURL *)newURL;

- (void)requestFinished:(ASIHTTPRequest *)request;

- (void)requestFailed:(ASIHTTPRequest *)request;

- (void)requestRedirected:(ASIHTTPRequest *)request;

- (void)request:(ASIHTTPRequest *)request didReceiveData:(NSData *)data;

- (void)authenticationNeededForRequest:(ASIHTTPRequest *)request;

- (void)proxyAuthenticationNeededForRequest:(ASIHTTPRequest *)request;

2.AFN基本使用

1.实现基本原理:

先看看AFHTTPRquestOperationManager的默认初始化方法：可以看出默认的request为二进制，reponse为json解析。可以根据业务进行修改。

- (instancetype)initWithBaseURL:(NSURL *)url {

    self = [super init];

    if (!self) {

        return nil;

    }

    // Ensure terminal slash for baseURL path, so that NSURL +URLWithString:relativeToURL: works as expected

    if ([[url path] length] >  && ![[url absoluteString] hasSuffix:@"/"]) {

        url = [url URLByAppendingPathComponent:@""];

    }

    self.baseURL = url;     //初始化了baseurl，比如你的访问地址是http://192.168.0.100/login.action . 初始化baseUrl为http://192.168.0.100/ , 以后manager GET:@"login.action"即可。

    self.requestSerializer = [AFHTTPRequestSerializer serializer];

    self.responseSerializer = [AFJSONResponseSerializer serializer];

    self.securityPolicy = [AFSecurityPolicy defaultPolicy]; //AFSSLPinningModeNone无隐私要求

    self.reachabilityManager = [AFNetworkReachabilityManager sharedManager];

    self.operationQueue = [[NSOperationQueue alloc] init];

    self.shouldUseCredentialStorage = YES;

    return self;

}

再看看其中一个方法GET方法。

AFHTTPRequestOperation 是 AFURLConnectionOperation的子类，AFURLConnectionOperation的子类是NSOperation的子类，并实现了NSURLConnectionDelegate等网络协议。

@interface AFURLConnectionOperation : NSOperation <NSURLConnectionDelegate, NSURLConnectionDataDelegate, NSSecureCoding, NSCopying>

是使用刚才manager初始化生成的operationQueue进行多线程管理，所以一个项目有一个manager然后用来管理网络请求就行了。多线程已经由AFN内部处理了。

- (AFHTTPRequestOperation *)GET:(NSString *)URLString

                     parameters:(id)parameters

                        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success

                        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure

{

    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithHTTPMethod:@"GET" URLString:URLString parameters:parameters success:success failure:failure];

    [self.operationQueue addOperation:operation];

    return operation;

}

AFHTTPRequestOperation的生成，复用了很多manager的属性：

- (AFHTTPRequestOperation *)HTTPRequestOperationWithRequest:(NSURLRequest *)request

                                                    success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success

                                                    failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure

{

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

    operation.responseSerializer = self.responseSerializer;

    operation.shouldUseCredentialStorage = self.shouldUseCredentialStorage;

    operation.credential = self.credential;

    operation.securityPolicy = self.securityPolicy;

    [operation setCompletionBlockWithSuccess:success failure:failure];  //注意这个地方

    operation.completionQueue = self.completionQueue;

    operation.completionGroup = self.completionGroup;

    return operation;

}

最后的回调，AFN是使用了NSOperation自己的block，难怪在协议找了好久没找到

- (void)setCompletionBlock:(void (^)(void))block {

    [self.lock lock];

    if (!block) {

        [super setCompletionBlock:nil];

    } else {

        __weak __typeof(self)weakSelf = self;

        [super setCompletionBlock:^ {

            __strong __typeof(weakSelf)strongSelf = weakSelf;

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wgnu"

            dispatch_group_t group = strongSelf.completionGroup ?: url_request_operation_completion_group();

            dispatch_queue_t queue = strongSelf.completionQueue ?: dispatch_get_main_queue();

#pragma clang diagnostic pop

            dispatch_group_async(group, queue, ^{

                block();

            });

            dispatch_group_notify(group, url_request_operation_completion_queue(), ^{

                [strongSelf setCompletionBlock:nil];

            });

        }];

    }

    [self.lock unlock];

}

2.基本GET

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    [manager GET:@"http://example.com/resources.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

        NSLog(@"JSON: %@", responseObject);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        NSLog(@"Error: %@", error);

    }];

3.下载一个文件

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

NSURL *URL = [NSURL URLWithString:@"http://example.com/download.zip"];

NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {

    NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];

    return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];

} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {

    NSLog(@"File downloaded to: %@", filePath);

}];

[downloadTask resume];
 

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