それは私にエラーを与える方法を対象

Question

[manager POST:urlString parameters:[self jsonDict] success:^(AFHTTPRequestOperation *operation, id responseObject){ 

     NSLog(@"response data: %@", responseObject); 


     NSArray *postFromResponse = [ responseObject valueForKeyPath:@"credentials"]; 
    NSLog(@"credentials:%@", postFromResponse); 

     for(NSDictionary *object in postFromResponse) 
     { 
      NSString *AccessKeyId = [object valueForKeyPath:@"AccessKeyId"]; 
      NSLog(@"%@", AccessKeyId); 
     } 



} 

に応答オブジェクトをキャストする方法：

Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSCFString 0x79ea4430> valueForUndefinedKey:]: this class is not key value coding-compliant for the key AccessKeyId'

Answer 1

はこれを試してみてください：

NSMutableDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil]; 
NSArray *postFromResponse = [responseDict valueforkey:@"credentials"]; 
for(NSDictionary *object in postFromResponse) { 
    NSString *AccessKeyId = [object valueforkey:@"AccessKeyId"]; 
    NSLog(@"%@", AccessKeyId); 
}