代码之家 › 专栏 › 技术社区 › Murat Kaya

AFNetworking数据参数为nil JSON数据

afnetworking uitableview json objective-c ios

Murat Kaya · 技术社区 · 11 年前

我有一个UITableViewController,我正在尝试使用此代码从url获取JSON数据,但我遇到了错误。我该怎么办?

  AFSecurityPolicy *securityPolicy = [[AFSecurityPolicy alloc] init];
        [securityPolicy setAllowInvalidCertificates:YES];

        NSString *urlPath = [NSString stringWithFormat:@"http://testurl.com/api/index.php"];
        AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

        NSDictionary *parameters = @{@"process":@"search_customer",@"page": @""};
        manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];

        [manager setSecurityPolicy:securityPolicy];
        manager.responseSerializer = [AFHTTPResponseSerializer serializer];

        [manager POST:urlPath parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
            NSString *string = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

            NSData *jsonData = [NSData dataWithContentsOfFile:string];
            NSError *error = nil;
            NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
            self.customerCards = [NSMutableArray array];
            NSArray *customersArray = [dataDictionary objectForKey:@"musteri_list"];
            for (NSDictionary *customersDictionary in customersArray) {
                ApiClass *customer = [ApiClass customersWithTitle:[customersDictionary objectForKey:@"adi"]];
                customer.tel = [customersDictionary objectForKey:@"tel"];

                [self.customerCards addObject:customer];
            }

            NSLog(@"GET: %@", string);
            NSLog(@"POST: %@", parameters);
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"Error: %@", error);
        }];

这是错误块

2015-03-26 14:27:37.656 SaphiraCrm[13770:3881729] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil'

2 回复 | 直到 11 年前

veducm 11 年前

我认为问题可能在于你正在治疗 responseObject 就好像是 NSData ,但根据 AFNetworking examples ,默认情况下 AFHTTPRequestOperationManager 的 responseSerializer 是一个 AFJSONResponseSerializer 所以 response对象 已解析为JSON,表示为 NSDictionary (取决于序列化程序)。

因此

NSString *string = [[NSString alloc] initWithData:responseObject
                                         encoding:NSUTF8StringEncoding];

回报 nil ,这将导致下一行

NSData *jsonData = [NSData dataWithContentsOfFile:string];

以引发异常。

我建议你检查一下 response对象 是您所期望的,并相应地重构代码。

...

[manager POST:urlPath 
   parameters:parameters 
      success:^(AFHTTPRequestOperation *operation, id responseObject) {
          if (responseObject) {
              NSLog(@"Response is a %@ and contains: %@", [responseObject class], responseObject);
              // Process responseObject according to its type

...

注: 很有可能,上述情况只是之前设置seriliazer配置方式错误的结果,因为您首先设置了 acceptableContentType 首先,然后用默认值覆盖它。

manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
...
manager.responseSerializer = [AFHTTPResponseSerializer serializer]; 
// this is likely to invalidate the previous, since you overwritting
// the manager's serializer with a new one with default configuration.

Murat Kaya 11 年前

好的,我想好了我该怎么做。

这是我的代码

AFSecurityPolicy *securityPolicy = [[AFSecurityPolicy alloc] init];
    [securityPolicy setAllowInvalidCertificates:YES];


    NSString *urlPath = [NSString stringWithFormat:@"http://test.com/api/index.php"];
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    NSDictionary *parameters = @{@"process":@"search_customer",@"page": @""};
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];

    [manager setSecurityPolicy:securityPolicy];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];

    [manager POST:urlPath parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSString *string = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
        NSError *error = nil;
        NSData *jsonData = [string dataUsingEncoding:NSUTF8StringEncoding];
        NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];

        self.customerCards = [NSMutableArray array];
        NSArray *customersArray = [dataDictionary objectForKey:@"musteri_list"];
        NSLog(@"%@",customersArray);
        for (NSDictionary *customersDictionary in customersArray) {
            ApiClass *customer = [ApiClass customersWithTitle:[customersDictionary objectForKey:@"adi"]];
            customer.tel = [customersDictionary objectForKey:@"tel"];

            [self.customerCards addObject:customer];

        }
        [self.tableView reloadData];

        NSLog(@"GET: %@", string);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];