IOS網絡訪問之使用AFNetworking<2>

IOS網絡訪問之使用AFNetworking

　　AFNetworking是IOS上經常使用的第三方網絡訪問庫，咱們能夠在github上下載它，同時github上有它詳細的使用說明，最新的AFNetworing2.0與1.0有很大的變化，這裏僅對2.0經常使用的使用方法進行總結

　　基於NSURLConnection的API

　　提交GET請求

　　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);

　　}];

　　AFResponseSerializer

　　上面代碼中responseObject表明了返回的值，當網絡返回json或者xml之類的數據時，它們的本質都是字符串，咱們須要經過必定操做才能把字符串轉成但願的對象，AFNetWorking經過設置AFHTTPRequestOperationManager對象的responseSerializer屬性替咱們作了這些事。

　　若是返回的數據時json格式，那麼咱們設定

　　manager.responseSerializer = [[AFJSONResponseSerializer alloc] init]，responseObject就是得到的json的根對象（NSDictionary或者NSArray）

　　若是返回的是plist格式咱們就用AFPropertyListResponseSerializer解析器

　　若是返回的是xml格式咱們就用AFXMLParserResponseSerializer解析器，responseObject表明了NSXMLParser對像

　　若是返回的是圖片，能夠使用AFImageResponseSerializer

　　若是隻是但願得到返回二進制格式，那麼能夠使用AFHTTPResponseSerializer

　　AFRequestSerializer

　　AFHTTPRequestOperationManager還能夠經過設置requestSeializer屬性設置請求的格式

　　有以下的請求地址與參數

　　NSString *URLString = @"http://example.com";

　　NSDictionary *parameters = @{@"foo": @"bar", @"baz": @[@1, @2, @3]};

　　咱們使用AFHTTPRequestSerializer的GET提交方式

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

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

　　咱們使用AFHTTPRequestSerializer的POST提交方式

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

　　POST http://example.com/

　　Content-Type: application/x-www-form-urlencoded

　　foo=bar&baz[]=1&baz[]=2&baz[]=3

　　咱們使用AFJSONRequestSerializer

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

　　POST http://example.com/

　　Content-Type: application/json

　　{"foo": "bar", "baz": [1,2,3]}

　　默認提交請求的數據是二進制（AFHTTPRequestSerializer）的,返回格式是JSON（AFJSONResponseSerializer）

提交POST請求

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); }];

　　提交POST請求時附帶文件

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); }];

　　也能夠經過appendPartWithFileData上傳NSData數據的文件

　　AFHTTPRequestOperation

　　除了使用AFHTTPRequestOperationManager訪問網絡外還能夠經過AFHTTPRequestOperation，AFHTTPRequestOperation繼承自AFURLConnectionOperation，

　　AFURLConnectionOperation繼承自NSOperation，因此能夠經過AFHTTPRequestOperation定義了一個網絡請求任務，而後添加到隊列中執行。

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];

　　批量任務處理

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];

　　上面的API是基於NSURLConnection，IOS7以後AFNetWorking還提供了基於NSURLSession的API

　　基於NSURLSession的API

　　下載任務

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];

　　文件上傳任務

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];

　　帶進度的文件上傳

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]; NSURLSessionDataTask 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];

　　查看網絡狀態

　　蘋果官方提供Reachablity用來查看網絡狀態，AFNetWorking也提供這方面的API

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; } }]; //開始監控 [manager.reachabilityManager startMonitoring];