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    <p>This is how I handled the problem on a SSN verification field, you can modify the max length and remove the <code>if</code> statement checking for keyboard type if you need to.</p> <p>There is also logic to suppress the max length alerts when the user is typing as opposed to pasting data.</p> <p>In the context of this code, <code>BasicAlert()</code> is a <code>#define</code> macro that simply shows a <code>UIAlertView</code> or <code>UIAlertController</code> using the title and message strings passed.</p> <pre><code>// NOTE: This code assumes you have set the UITextField(s)'s delegate property to the object that will contain this code, because otherwise it would never be called. - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { // allow backspace if (!string.length) { return YES; } // Prevent invalid character input, if keyboard is numberpad if (textField.keyboardType == UIKeyboardTypeNumberPad) { if ([string rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet].invertedSet].location != NSNotFound) { // BasicAlert(@"", @"This field accepts only numeric entries."); return NO; } } // verify max length has not been exceeded NSString *proposedText = [textField.text stringByReplacingCharactersInRange:range withString:string]; if (proposedText.length &gt; 4) // 4 was chosen for SSN verification { // suppress the max length message only when the user is typing // easy: pasted data has a length greater than 1; who copy/pastes one character? if (string.length &gt; 1) { // BasicAlert(@"", @"This field accepts a maximum of 4 characters."); } return NO; } // only enable the OK/submit button if they have entered all numbers for the last four of their SSN (prevents early submissions/trips to authentication server) self.answerButton.enabled = (proposedText.length == 4); return YES; } </code></pre>
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    1. POAllow only Numbers for UITextField input
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    1. COThanks! The 'remove invalid characters from input, if keyboard is numberpad' section helped answer my question!
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