AFNetworking 学习

AFNetworking 主要使用NSURLConnection, NSOperation来创建网络请求。

1.HttpRequestOperationManager

GET 请求

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);}];

POST请求

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];NSDictionary *parameters = @{@"foo": @"bar"};[manager POST:@"http://example.com/resources.json" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {    NSLog(@"JSON: %@", responseObject);} failure:^(AFHTTPRequestOperation *operation, NSError *error) {    NSLog(@"Error: %@", error);}];

POST多部间请求

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];NSDictionary *parameters = @{@"foo": @"bar"};NSURL *filePath = [NSURL fileURLWithPath:@"file://path/to/image.png"];[manager POST:@"http://example.com/resources.json" parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {    [formData appendPartWithFileURL:filePath name:@"image" error:nil];} success:^(AFHTTPRequestOperation *operation, id responseObject) {    NSLog(@"Success: %@", responseObject);} failure:^(AFHTTPRequestOperation *operation, NSError *error) {    NSLog(@"Error: %@", error);}];

以上是常用的http请求例子，下面说一下上传和下载.

上传和下载使用NSURLSession实现，NSURLSession是ios7中新的网络请求接口。程序在前台时，NSURLSession和NSURLConnection可互为替代工作。

在AFNetworking中，主要的类是AFURLSessionManager和AFHttpSessionManager.下面看例子：

下载

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];

上传

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];NSURL *URL = [NSURL URLWithString:@"http://example.com/upload"];NSURLRequest *request = [NSURLRequest requestWithURL:URL];NSURL *filePath = [NSURL fileURLWithPath:@"file://path/to/image.png"];NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithRequest:request fromFile:filePath progress:nil completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {    if (error) {        NSLog(@"Error: %@", error);    } else {        NSLog(@"Success: %@ %@", response, responseObject);    }}];[uploadTask resume];

多部件带进度的上传

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {        [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"file://path/to/image.jpg"] name:@"file" fileName:@"filename.jpg" mimeType:@"image/jpeg" error:nil];    } error:nil];AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];NSProgress *progress = nil;NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {    if (error) {        NSLog(@"Error: %@", error);    } else {        NSLog(@"%@ %@", response, responseObject);    }}];[uploadTask resume];

上传任意数据

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];NSURL *URL = [NSURL URLWithString:@"http://example.com/upload"];NSURLRequest *request = [NSURLRequest requestWithURL:URL];NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {    if (error) {        NSLog(@"Error: %@", error);    } else {        NSLog(@"%@ %@", response, responseObject);    }}];[dataTask resume];

 使用AFHTTPRequestSerializer 将请求参数序列化，看下面例子

NSString *URLString = @"http://example.com";NSDictionary *parameters = @{@"foo": @"bar", @"baz": @[@1, @2, @3]};

[[AFHTTPRequestSerializer serializer] requestWithMethod:@"GET" URLString:URLString parameters:parameters error:nil];

GET http://example.com?foo=bar&baz[]=1&baz[]=2&baz[]=3

[[AFHTTPRequestSerializer serializer] requestWithMethod:@"POST" URLString:URLString parameters:parameters];

POST http://example.com/Content-Type: application/x-www-form-urlencodedfoo=bar&baz[]=1&baz[]=2&baz[]=3

[[AFJSONRequestSerializer serializer] requestWithMethod:@"POST" URLString:URLString parameters:parameters];

POST http://example.com/Content-Type: application/json{"foo": "bar", "baz": [1,2,3]}

使用AFNetworkReachabilityManager 监测网络状态

[[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {    NSLog(@"Reachability: %@", AFStringFromNetworkReachabilityStatus(status));}];

以下代码是只在wifi情况下才发出请求

NSURL *baseURL = [NSURL URLWithString:@"http://example.com/"];AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:baseURL];NSOperationQueue *operationQueue = manager.operationQueue;[manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {    switch (status) {        case AFNetworkReachabilityStatusReachableViaWWAN:        case AFNetworkReachabilityStatusReachableViaWiFi:            [operationQueue setSuspended:NO];            break;        case AFNetworkReachabilityStatusNotReachable:        default:            [operationQueue setSuspended:YES];            break;    }}];[manager.reachabilityManager startMonitoring];

单独使用AFHttpRequestOperation 

NSURL *URL = [NSURL URLWithString:@"http://example.com/resources/123.json"];NSURLRequest *request = [NSURLRequest requestWithURL:URL];AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];op.responseSerializer = [AFJSONResponseSerializer serializer];[op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {    NSLog(@"JSON: %@", responseObject);} failure:^(AFHTTPRequestOperation *operation, NSError *error) {    NSLog(@"Error: %@", error);}];[[NSOperationQueue mainQueue] addOperation:op];

批量操作

NSMutableArray *mutableOperations = [NSMutableArray array];for (NSURL *fileURL in filesToUpload) {    NSURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {        [formData appendPartWithFileURL:fileURL name:@"images[]" error:nil];    }];    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];    [mutableOperations addObject:operation];}NSArray *operations = [AFURLConnectionOperation batchOfRequestOperations:@[...] progressBlock:^(NSUInteger numberOfFinishedOperations, NSUInteger totalNumberOfOperations) {    NSLog(@"%lu of %lu complete", numberOfFinishedOperations, totalNumberOfOperations);} completionBlock:^(NSArray *operations) {    NSLog(@"All operations in batch complete");}];[[NSOperationQueue mainQueue] addOperations:operations waitUntilFinished:NO];