__NSCFBoolean isEqualToString:]: unrecognized selector sent to instance

Question

when i am getting values from JSON php then i am getting issue for __NSCFBoolean isEqualToString:

My code is as follow:

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
        //convert to JSON
        for(id key in res) {
        id value = [res objectForKey:key];

        NSString *keyAsString = (NSString *)key;
        NSString *valueAsString = (NSString *)value;
        //NSCFBoolean
        /*if([value isKindOfClass:[NSNumber class]])
        {
            printf("Number");
        }
        else if([value isKindOfClass:[NSString class]])
        {
            printf("String --- \n");
            if([value isEqualToString:@"0"])
            {
                printf("Wrong \n");
            }
            else
            {
                printf("Right \n");
            }
        }*/
        NSLog(@"%@",[valueAsString class]);
        if([keyAsString isEqualToString:@"success"])
        {
            printf("Working \n");
        }
        else
        {
            printf("Not Working\n");
        }
        //Error is in below line
        if([valueAsString isEqualToString:@"0"])// strcmp([value objCType], @encode(BOOL)) == 1)
        {
            [self loginSuccess];
        }
        else if(strcmp([value objCType], @encode(BOOL)) == 0)
        {
            [self loginFailure];
        }
        NSLog(@"key: %@", keyAsString);
        NSLog(@"value: %@", valueAsString);
    }

} }

Getting issue of [__NSCFBoolean isEqualToString:]: unrecognized selector sent to instance 0x1dc9964

Searching Google for this issue from yesterday, But No solution yet. NSCFBoolean is also not available in iOS 6.0, now. So what could i do to check "0" or "1" from JSON string? Please help.

Answer 1

value is a NSNumber object (__NSCFBoolean, because NSNumber is a class cluster) and not a string! Use [value boolValue] to determine whether it's 0 or 1.

Casting an object doesn't change it's type!