I have made a function to consume webservices , now I want to check if (id) object is null or not. What I am doing is here:
-(void)callService:(NSString*)request param:(NSString*) parameters completion:(void (^)(NSArray *list, NSError *error))completionHandler
{
[self.manager POST:request parameters:parameters success:^(NSURLSessionDataTask *task, id responseObject) {
NSLog(@"Response Object: %@", responseObject);
if (![responseObject isKindOfClass:[NSNull class]]) {
[self methodUsingJsonFromSuccessBlock:responseObject];
if (completionHandler) {
//NSLog(@"%@", list);
completionHandler(list,nil);
}
}
else {
NSLog(@"Nothing found");
}
}failure:^(NSURLSessionDataTask *task, NSError *error) {
//NSLog(@"Error: %@", [error description]);
if (completionHandler) {
completionHandler(nil,error);
}
}];
}
but what I have found on break points is when (id) is null it has NSZeroData but no NSNull so it always passes my condition. I am using AFNetworking
Thanks in advance for helping me out.
Your responseObject
is not NSNull
, but an NSData
(which _NSZeroData
is a subclass of).
So what you really want is this condition:
if ([responseObject isKindOfClass:[NSData class]] && ((NSData *)responseObject).length > 0) {
// ...
}