"Format string is not string literal (potentially insecure)" [duplicate] - ios

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Format String is not a literal string (potentially insecure) warning [duplicate]
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Warning : Format string is not a string literal (potentially insecure)
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Closed 8 years ago.
I'm creating a school app that displays the messages, users and the timestamp. I tried looking online for a fix to this but i couldn't find anything that I could understand. I'm new to programming and anything could help. I read somewhere that NSLog could help but I don't know how it's used. Please help!
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"messagesCell";
MessageTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
reversedMessages = [[messagesArray reverseObjectEnumerator] allObjects];
PFObject *tempObject = [reversedMessages objectAtIndex:indexPath.row];
cell.cellTitle.text = [tempObject objectForKey:#"content"];
cell.userName.text = [tempObject objectForKey:#"user"];
NSDate *createdAt = [tempObject createdAt];
NSDateFormatter *dateDisplay = [[NSDateFormatter alloc] init];
[dateDisplay setDateFormat:#"MMM, d h:mm a"];
**cell.timeStamp.text = [NSString stringWithFormat: [dateDisplay stringFromDate:createdAt]];**
return cell;
}

Answer 1

If you're using stringWithFormat, it expects a format string with %#'s being replaced by comma-separated parameters, like this:
[NSString stringWithFormat:#"This is param1: %#, and param2: %#", param1, param2];
If you're using a normal NSString, you want to simply do this:
cell.timeStamp.text = [dateDisplay stringFromDate:createdAt];
The alternative, which I want to doubly emphasize is just to contrast with the better way above and in this case is pointless, would be:
cell.timeStamp.text = [NSString stringWithFormat:#"%#", [dateDisplay stringFromDate:createdAt]];