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    <p>This is specific to the OP's <code>UIAlertView</code>-wrapping case, and tested only on iOS7: It appears that once a <code>UIAlertView</code> has been initialised with <code>otherButtons:nil</code>, and then has its style set to <code>UIAlertViewStylePlainTextInput</code> it doesn't call its delegate's <code>alertViewShouldEnableFirstOtherButton:</code> to validate input. I'm not sure if this is a bug or intended behaviour but it broke my principle of least astonishment. This is reproducible with the following (I'll assume the delegate's <code>alertViewShouldEnableFirstOtherButton:</code> is implemented):</p> <pre><code>UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Title" message:@"message" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil]; [av setAlertViewStyle:UIAlertViewStylePlainTextInput]; [av addButtonWithTitle:@"OK"]; [av show]; </code></pre> <p>The solution, since UIAlertView happily accepts <code>otherButtons:nil</code>, is to initialise <code>UIAlertView</code> with otherButtonTitles (which can be nil), and iterate over the variadic arguments, as above:</p> <pre><code>+ (void)showWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles, ... { UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:title message:message delegate:delegate cancelButtonTitle:cancelButtonTitle otherButtonTitles:otherButtonTitles] autorelease]; // add your [alert setAlertViewStyle:UIAlertViewStylePlainTextInput] etc. as required here if (otherButtonTitles != nil) { va_list args; va_start(args, otherButtonTitles); NSString * title = nil; while(title = va_arg(args,NSString*)) { [alert addButtonWithTitle:title]; } va_end(args); } [alert show]; } </code></pre>
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    1. POObjective-C passing around ... nil terminated argument lists
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    1. USRobin Macharg
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    1. COWhile this is interesting information and should definitely be reported at Apple's [bug reporter](http://bugreport.apple.com/) it is not an answer to this post. As I understand it it does not provide additional information to question asked.
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      1. USNikolai Ruhe
    2. COAlready reported. I agree, in part; it's a correction to the accepted answer in the place Google brought me to when I was struggling with variadic UIAlertView wrapping of my own. Maybe it will help someone else...
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      1. USRobin Macharg
 

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