Re: Setting a delegate on a UITextField
Re: Setting a delegate on a UITextField
- Subject: Re: Setting a delegate on a UITextField
- From: Ray <email@hidden>
- Date: Fri, 04 Mar 2011 14:04:36 +0900
> Message: 8
> Date: Thu, 03 Mar 2011 18:29:23 -0800 (PST)
> From: Jon Sigman <email@hidden>
> Subject: Re: Setting a delegate on a UITextField
> To: Cocoa Developers <email@hidden>
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=us-ascii
>
> Okay, part II:
>
> Is there a way to allow only a certain number of characters in a UITextField?
> Should this be done in the -textFieldDidEndEditing delegate callback, with an
> alert to the user, or just truncating the field, or ...?
>
> -Jon
>
>
>
>
>
> ------------------------------
>
> Message: 9
> Date: Thu, 03 Mar 2011 18:51:39 -0800 (PST)
> From: Dianne <email@hidden>
> Subject: Re: Setting a delegate on a UITextField
> To: Jon Sigman <email@hidden>, Cocoa Developers
> <email@hidden>
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=us-ascii
>
> there is, you need to use a formatter for that, you can even set the allowed
> characters to be inputted to the textfield.
> check NSFormatter if it is of any help, you can also extend the class to adjust
> to your needs.
Hmm, interesting, I didn't think of that. I remember in some earlier code I did something like so, using a notification... just as an example in some iOS app:
- (void)textFieldTextDidChange:(NSNotification*)aNotification {
NSInteger remaining = [[aNotification.object text] length];
if (remaining < self.minLength) {
self.tableView.tableFooterView.hidden = NO;
[self.headerLabel setText:[NSString stringWithFormat:NSLocalizedString(@"Remaining characters required: %d", nil),
(self.minLength - remaining)]];
self.navigationItem.rightBarButtonItem.enabled = NO;
} else {
self.tableView.tableFooterView.hidden = YES;
self.navigationItem.rightBarButtonItem.enabled = YES;
}
}
Overkill?_______________________________________________
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