saveInBackgroundWithBlock not calling the block when it finished working - parse-platform

Question

I'm trying to do a simple chat in iOS with Obj-C, and when I press the "send" button, I save the object into Parse and I retrieve all the messages.
When it succeeds, I retrieve all the messages so the last one (mine) should be retrieved as well, but the last one never gets called. What should I do?
This is my code:
NSMutableArray *messagesArray;
- (IBAction)sendButtonTapped:(id)sender {
self.sendButton.enabled = false;
self.textField.enabled = false;
PFObject *objectChat = [PFObject objectWithClassName: #"ChatClass"];
objectChat[#"text"] = self.textField.text;
[objectChat saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
self.sendButton.enabled = true;
self.textField.enabled = true;
if (succeeded) {
self.textField.text = #"";
[self retrieveMessages];
NSLog(#"success!");
} else {
NSLog(error.description);
}
}];
}
-(void) retrieveMessages {
NSDate *now = [NSDate date];
PFQuery *query = [PFQuery queryWithClassName:#"ChatClass"];
[query whereKey:#"createdAt" lessThanOrEqualTo:now];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (error == nil) {
messagesArray = [[NSMutableArray alloc] init];
for (int i = 0; i < [objects count]; i++) {
[messagesArray addObject:[[objects objectAtIndex:i] objectForKey:#"text"]];
}
runOnMainQueueWithoutDeadlocking(^{
[self.messageTableView reloadData];
});
}
}];
}
void runOnMainQueueWithoutDeadlocking(void (^block)(void))
{
if ([NSThread isMainThread])
{
block();
}
else
{
dispatch_async(dispatch_get_main_queue(), block);
}
}
Thank you very much in advance.
Regards.

Answer 1

Perhaps there's enough of a clock difference with the parse server that the time qualification misses the object just created. Removing that line should do the trick.