iOS网络访问之使用AFNetworking

　　AFNetworking是IOS上常用的第三方网络访问库，我们可以在github上下载它，同时github上有它详细的使用说明，最新的AFNetworing2.0与1.0有很大的变化，这里仅对2.0常用的使用方法进行总结

　　基于NSURLConnection的API

　　提交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);

　　}];

　　AFResponseSerializer

　　上面代码中responseObject代表了返回的值，当网络返回json或者xml之类的数据时，它们的本质都是字符串，我们需要通过一定操作才能把字符串转成希望的对象，AFNetWorking通过设置AFHTTPRequestOperationManager对象的responseSerializer属性替我们做了这些事。

　　如果返回的数据时json格式，那么我们设定

　　manager.responseSerializer = [[AFJSONResponseSerializer alloc] init]，responseObject就是获得的json的根对象（NSDictionary或者NSArray）

　　如果返回的是plist格式我们就用AFPropertyListResponseSerializer解析器

　　如果返回的是xml格式我们就用AFXMLParserResponseSerializer解析器，responseObject代表了NSXMLParser对像

　　如果返回的是图片，可以使用AFImageResponseSerializer

　　如果只是希望获得返回二进制格式，那么可以使用AFHTTPResponseSerializer

　　AFRequestSerializer

　　AFHTTPRequestOperationManager还可以通过设置requestSeializer属性设置请求的格式

　　有如下的请求地址与参数

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

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

　　我们使用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

　　我们使用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

　　我们使用AFJSONRequestSerializer

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

　　POST http://example.com/

　　Content-Type: application/json

　　{"foo": "bar", "baz": [1,2,3]}

　　默认提交请求的数据是二进制（AFHTTPRequestSerializer）的,返回格式是JSON（AFJSONResponseSerializer）

提交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);

}];

　　提交POST请求时附带文件

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);

}];

　　也可以通过appendPartWithFileData上传NSData数据的文件

　　AFHTTPRequestOperation

　　除了使用AFHTTPRequestOperationManager访问网络外还可以通过AFHTTPRequestOperation，AFHTTPRequestOperation继承自AFURLConnectionOperation，

　　AFURLConnectionOperation继承自NSOperation，所以可以通过AFHTTPRequestOperation定义了一个网络请求任务，然后添加到队列中执行。

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];

　　批量任务处理

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是基于NSURLConnection，IOS7之后AFNetWorking还提供了基于NSURLSession的API

　　基于NSURLSession的API

　　下载任务

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];

　　文件上传任务

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];

　　带进度的文件上传

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];

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];

　　查看网络状态

　　苹果官方提供Reachablity用来查看网络状态，AFNetWorking也提供这方面的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;

}

}];

//开始监控

[manager.reachabilityManager startMonitoring];