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我编写了一个自定义类来处理 HTTP 请求，结果我想为下一个请求获取一个带有 BODY 的 NSString，但是当我尝试从这个对象传递这个新创建的 BODY 时，我得到的只是（null）。

但是足够的话......让我给你看代码：

这是 ViewController 代码

#import "ViewController.h"
#import "HTTPRequestHandler.h"


//Definition of constants for URLs which are being used for requests
#define GET_GRANT_KEY_URL @"http://own-dev1.railwaymen.org:4006/api/get_grant_key"
#define PULL_USER_LOCATIONS_URL @"http://own-dev1.railwaymen.org:4006/api/pull_user_locations"
#define ANCHOR_TERMINAL_URL @"http://own-dev1.railwaymen.org:4006/api/anchor_terminal"

//Definition of constants for first request body
#define GRANT_KEY_BODY @"email=vergun@gmail.com&password=password"
#define PULL_USER_LOCATIONS_BODY @"user_id=b6db2184-8b16-433d-ae21-a9a415d9d4dc&grant_key=2aa1d743e7ebc2b5eb7f278f1da62b30d70c1510"
#define ANCHOR_TERMINAL_BODY @"user_id=b6db2184-8b16-433d-ae21-a9a415d9d4dc&grant_key=2aa1d743e7ebc2b5eb7f278f1da62b30d70c1510&location_id=b91d0894-ce90-47dc-b431-4f67252310f2&client_id=2938472398492&client_secret=017305462947509274"

@interface ViewController ()

@property (strong, nonatomic) NSMutableString *resultHTTPBody;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (IBAction)makeRequests {
    //First request
    HTTPRequestHandler *getGrantKeyRequest = [[HTTPRequestHandler alloc] initWithURL:GET_GRANT_KEY_URL
                                                                                body:GRANT_KEY_BODY
                                                                      keysToRecievie:@[@"user_id", @"grant_key"]];
    [getGrantKeyRequest makeConnectionWithRequest];

    //Second request
    HTTPRequestHandler *pullUserLocationsRequest = [[HTTPRequestHandler alloc] initWithURL:PULL_USER_LOCATIONS_URL
                                                                                      body:PULL_USER_LOCATIONS_BODY
                                                                            keysToRecievie:@[@"location_id"]];
    [pullUserLocationsRequest makeConnectionWithRequest];

    //Third request
    HTTPRequestHandler *anchorTerminalRequest = [[HTTPRequestHandler alloc] initWithURL:ANCHOR_TERMINAL_URL
                                                                                   body:ANCHOR_TERMINAL_BODY
                                                                         keysToRecievie:@[@"access_token"]];
    [anchorTerminalRequest makeConnectionWithRequest];
}
@end

这是来自我的 cusstrom 类的 .m 文件

@interface HTTPRequestHandler ()

@property (strong, nonatomic) NSURL *requestURL;
@property (strong, nonatomic) NSData *httpBody;
@property (strong, nonatomic) NSMutableData *responseData;
@property (strong, nonatomic) NSArray *keysToRecieveValues;

@end

@implementation HTTPRequestHandler

- (id)initWithURL:(NSString *)url body:(NSString *)body keysToRecievie:(NSArray *)keys
{
    if (self = [super init])
    {
        self.responseData = [NSMutableData data];
        self.requestURL = [[NSURL alloc] initWithString:url];
        self.httpBody = [body dataUsingEncoding:NSUTF8StringEncoding];
        self.keysToRecieveValues = [[NSArray alloc] initWithArray:keys];
    }

    return self;
}

- (void)makeConnectionWithRequest
{
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:self.requestURL];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:self.httpBody];
    [NSURLConnection connectionWithRequest:request delegate:self];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [self.responseData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [self.responseData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    [self setRecievedData:[NSJSONSerialization JSONObjectWithData:self.responseData options:kNilOptions error:nil]];
    NSLog(@"%@", [self createNewBodyWithInitializedKeys]);
}

- (NSString *)createNewBodyWithInitializedKeys
{
    NSMutableString *tmpString = [[NSMutableString alloc] init];;

    for (NSString *key in self.keysToRecieveValues)
    {
        [tmpString appendFormat:@"%@=%@?", key, [self.recievedData valueForKey:key]];
    }

    [tmpString deleteCharactersInRange:NSMakeRange([tmpString length]-1, 1)];
    return tmpString;
}

@end

最后，HTTPRequestHandler 的标头：

#import <Foundation/Foundation.h>

@interface HTTPRequestHandler : NSObject

@property (strong, nonatomic) NSDictionary *recievedData;

- (id)initWithURL:(NSString *)url body:(NSString *)body keysToRecievie:(NSArray *)keys;
- (void)makeConnectionWithRequest;
- (NSString *)createNewBodyWithInitializedKeys;

@end

如果您能告诉我任何提示或显示我的错误，我将不胜感激。

4

1 回答 1

0

好的，所以我检查了您的 url 的响应（希望您不介意），似乎响应不是 JSON 格式，这就是NSJSONSerialization返回 nil 的原因，请检查您的服务器响应并使用在线工具或其他工具进行验证以确保它是 JSON 格式。

编辑

我知道在 xcode 4.4 及更高版本@ synthesise中不再需要它，但无论如何你都应该添加它（以防万一），而且，如果你声明一个属性变量，你应该将它用作属性变量（self.property），除非你是在 getter 方法或 setter 方法中做一些其他的事情。

于 2013-05-17T08:57:25.150 回答