学步园

    if ([self respondsToSelector:@selector(request)]) {
        NSLog(@"request is exit");
    }else
    {
        NSLog(@"request is exit");
    }
    
    if ([self respondsToSelector:@selector(request1)]) {
        NSLog(@"request1 is exit");
    }else
    {
          NSLog(@"request1 is not exit");
    }

-(void)request
{
    __block NBProgressHUD* nBProgres;
    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        dispatch_async(dispatch_get_main_queue(), ^{
        });
        NSMutableDictionary* postData=[NSMutableDictionary new];
        [postData setObject:@"api.doctor.login" forKey:@"apiName"];
        [postData setObject:@"sun" forKey:@"check_number,%@"];
        [postData setObject:@"123456" forKey:@"password,%@"];
  
        dispatch_async(dispatch_get_main_queue(), ^{
        });
    });

}