如何使用2个参数进行POST NSURLRequest？ [英] How to make POST NSURLRequest with 2 parameters?

问题描述

我想在 NSURLRequest 中添加2个参数。
有没有办法或者我应该使用AFnetworking？

I want to add 2 parameters to NSURLRequest. Is there a way or should I use AFnetworking?

推荐答案

如果你使用AFNetworking可能会更容易。如果您有自己想做的事情，可以使用 NSURLSession ，但是您必须编写更多代码。

It will probably be easier to do if you use AFNetworking. If you have some desire to do it yourself, you can use NSURLSession, but you have to write more code.

1. 如果您使用AFNetworking，它会处理序列化请求，区分成功和错误等所有这些细节：

1. If you use AFNetworking, it takes care of all of this gory details of serializing the request, differentiating between success and errors, etc.:

NSDictionary *params = @{@"firstname": @"John", @"lastname": @"Doe"};

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager POST:urlString parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
    NSLog(@"responseObject = %@", responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
    NSLog(@"error = %@", error);
}];

这假设来自服务器的响应是JSON。如果不是（例如，如果是纯文本或HTML），您可以在 POST 之前使用：

This assumes that the response from the server is JSON. If not (e.g. if plain text or HTML), you might precede the POST with:

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

如果使用 NSURLSession ，您可以像这样构造请求：

If doing it yourself with NSURLSession, you might construct the request like so:

NSDictionary *params = @{@"firstname": @"John", @"lastname": @"Doe"};

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:[self httpBodyForParameters:params]];

您现在可以使用 NSURLSession 发起请求。例如，您可以这样做：

You now can initiate the request with NSURLSession. For example, you might do:

NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    if (error) {
        NSLog(@"dataTaskWithRequest error: %@", error);
    }

    if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
        NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
        if (statusCode != 200) {
            NSLog(@"Expected responseCode == 200; received %ld", (long)statusCode);
        }
    }

    // If response was JSON (hopefully you designed web service that returns JSON!),
    // you might parse it like so:
    //
    // NSError *parseError;
    // id responseObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
    // if (!responseObject) {
    //     NSLog(@"JSON parse error: %@", parseError);
    // } else {
    //     NSLog(@"responseObject = %@", responseObject);
    // }

    // if response was text/html, you might convert it to a string like so:
    //
    // NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    // NSLog(@"responseString = %@", responseString);
}];
[task resume];

其中

/** Build the body of a `application/x-www-form-urlencoded` request from a dictionary of keys and string values

 @param parameters The dictionary of parameters.
 @return The `application/x-www-form-urlencoded` body of the form `key1=value1&key2=value2`
 */
- (NSData *)httpBodyForParameters:(NSDictionary *)parameters {
    NSMutableArray *parameterArray = [NSMutableArray array];

    [parameters enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
        NSString *param = [NSString stringWithFormat:@"%@=%@", [self percentEscapeString:key], [self percentEscapeString:obj]];
        [parameterArray addObject:param];
    }];

    NSString *string = [parameterArray componentsJoinedByString:@"&"];

    return [string dataUsingEncoding:NSUTF8StringEncoding];
}

和

/** Percent escapes values to be added to a URL query as specified in RFC 3986.

 See http://www.ietf.org/rfc/rfc3986.txt

 @param string The string to be escaped.
 @return The escaped string.
 */
- (NSString *)percentEscapeString:(NSString *)string {
    NSCharacterSet *allowed = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~"];
    return [string stringByAddingPercentEncodingWithAllowedCharacters:allowed];
}

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