iOS AFNetworking的使用

转：http://www.cnblogs.com/lookenwu/p/3927897.html

AFNetworking几乎是iOS上最常用的HTTP库了，AFNetworking也确实用起来简单，重要的API就那么几个，但是就那么几个就足够用了。下面介绍几个AFNetworking 2.x重要的API。

如果你要支持iOS6那么你应该要使用基于NSURLConnection封装的AFHTTPRequestOperationManager（推荐用manager，尽管用AFHTTPRequestOperation也可以）。

GET请求

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
//manager.responseSerializer = [AFHTTPResponseSerializer serializer];//AFHTTPRequestOperationManager默认是json响应，如果你的服务端不是json响应则应该更改响应类型，用通用的http响应是个不错的选择
NSDictionary *parameters = @{@"q1": @"query1", @"q2": @"query2"};//向服务器请求的参数，也就是查询条件
[manager GET:@"http://www.yourcompany.com/service/afnetwork.php" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
　　//在这个地方解析服务器的响应，也就是responseObject　
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
　　//处理错误
    NSLog(@"Error: %@", error);
}];

POST请求

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = @{@"q1": @"query1", @"q2": @"query2"};
[manager POST:@"http://www.yourcompany.com/service/afnetwork.php" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
　　//解析服务器的响应responseObject，是否要更改响应类型说明同上
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

如果你要上传NSData数据或文件（比如图片）的话，可以使用如下POST API

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = @{@"q1": @"query1", @"q2": @"query2"};
NSURL *filePath = [NSURL fileURLWithPath:@"file://path/to/image.png"];
[manager POST:@"http://www.yourcompany.com/service/afnetwork.php" parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileURL:filePath name:@"image"];
    //[formData appendPartWitFileData:imgData name:@"image" fileName:@"filename" mimeType:@"image/jpeg"]
} success:^(AFHTTPRequestOperation *operation, id responseObject) {
    //处理服务器端的响应responseObject，响应类型是否需要更改说明同上
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

如果只支持iOS7及以上可以使用基于NSURLSession的API，可以看看官方指南URL Loading System

创建一个下载任务

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];//如果希望在后台继续下载，需配置后台session
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURL *URL = [NSURL URLWithString:@"http://www.yourcompany.com/service/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];//data task要调用resume

创建一个上传任务

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURL *URL = [NSURL URLWithString:@"http://www.yourcompany.com/service/upload.php"];
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];

创建一个http/json/xml响应任务

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURL *URL = [NSURL URLWithString:@"http://www.yourcompany.com/service/afnetwork.php"];
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);//responseObject即为响应的json/xml数据
    }
}];
[dataTask resume];

当然可以用更简单的办法，AFHTTPSessionManager提供了和AFHTTPRequestOperationManager类似的API

– GET:parameters:success:failure:
– POST:parameters:success:failure:
– POST:parameters:constructingBodyWithBlock:success:failure:

其调用方式和AFHTTPRequestOperationManager一样。