AFNetworking 数据参数为 nil JSON 数据
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【中文标题】AFNetworking 数据参数为 nil JSON 数据【英文标题】:AFNetworking Data Parameter is nil JSON Data 【发布时间】:2015-03-26 12:31:10 【问题描述】:我有一个 UITableViewController,我正在尝试使用此代码从 url 获取 JSON 数据,但出现错误。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'
【问题讨论】:
你假设 [dataDictionary objectForKey:@"musteri_list"];存在。如果您没有有效的 dataDictionary,则该行下的所有代码都会导致崩溃。所以在开始使用循环条件之前验证字符串、jsonData、dataDictionary 等是否有效。 另外你为什么不使用AFJSONResponseSerializer
直接获取JSON。
尝试使用断点调试它并准确检查它崩溃的位置。
【参考方案1】:
我认为问题可能在于您将responseObject
视为NSData
,但根据AFNetworking
examples,默认情况下AFHTTPRequestOperationManager
的responseSerializer
是AFJSONResponseSerializer
,所以responseObject
已经是一个已解析的 JSON,表示为 NSDictionary
(取决于序列化程序)。
因此,这条线
NSString *string = [[NSString alloc] initWithData:responseObject
encoding:NSUTF8StringEncoding];
返回nil
,这会导致下一行
NSData *jsonData = [NSData dataWithContentsOfFile:string];
引发异常。
我建议您检查 responseObject
是否符合您的预期并相应地重构您的代码。
...
[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
...
注意:
以上很可能只是您之前设置串行器配置方式错误的结果,因为您首先设置了acceptableContentType
,然后用默认设置覆盖它。
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.
【讨论】:
【参考方案2】:好吧,我想出了我该怎么做。
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);
];
【讨论】:
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