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copied!<p><strong>UPDATE</strong></p> <p>I cannot delete this answer because it is the accepted one, but it was not correct. Here is the correct code, copied from TomA below:</p> <pre><code>#define MAXLENGTH 10 - (BOOL)textField:(UITextField *) textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSUInteger oldLength = [textField.text length]; NSUInteger replacementLength = [string length]; NSUInteger rangeLength = range.length; NSUInteger newLength = oldLength - rangeLength + replacementLength; BOOL returnKey = [string rangeOfString: @"\n"].location != NSNotFound; return newLength <= MAXLENGTH || returnKey; } </code></pre> <p><strong>ORIGINAL</strong></p> <p>I think you mean UITextField. If yes, then there is a simple way.</p> <ol> <li>Implement the <a href="http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UITextFieldDelegate_Protocol/UITextFieldDelegate/UITextFieldDelegate.html" rel="noreferrer">UITextFieldDelegate</a> protocol</li> <li>Implement the <code>textField:shouldChangeCharactersInRange:replacementString:</code> method.</li> </ol> <p>That method gets called on every character tap or previous character replacement. in this method, you can do something like this:</p> <pre><code>- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { if ([textField.text length] > MAXLENGTH) { textField.text = [textField.text substringToIndex:MAXLENGTH-1]; return NO; } return YES; } </code></pre>

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