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    <p>This is how I do it:</p> <pre><code>// Define some constants: #define ALPHA @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" #define NUMERIC @"1234567890" #define ALPHA_NUMERIC ALPHA NUMERIC // Make sure you are the text fields 'delegate', then this will get called before text gets changed. - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { // This will be the character set of characters I do not want in my text field. Then if the replacement string contains any of the characters, return NO so that the text does not change. NSCharacterSet *unacceptedInput = nil; // I have 4 types of textFields in my view, each one needs to deny a specific set of characters: if (textField == emailField) { // Validating an email address doesnt work 100% yet, but I am working on it.... The rest work great! if ([[textField.text componentsSeparatedByString:@"@"] count] &gt; 1) { unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:[ALPHA_NUMERIC stringByAppendingString:@".-"]] invertedSet]; } else { unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:[ALPHA_NUMERIC stringByAppendingString:@".!#$%&amp;'*+-/=?^_`{|}~@"]] invertedSet]; } } else if (textField == phoneField) { unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:NUMERIC] invertedSet]; } else if (textField == fNameField || textField == lNameField) { unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:ALPHA] invertedSet]; } else { unacceptedInput = [[NSCharacterSet illegalCharacterSet] invertedSet]; } // If there are any characters that I do not want in the text field, return NO. return ([[string componentsSeparatedByCharactersInSet:unacceptedInput] count] &lt;= 1); } </code></pre> <p>Check out the <a href="http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UITextFieldDelegate_Protocol/UITextFieldDelegate/UITextFieldDelegate.html" rel="noreferrer">UITextFieldDelegate Reference</a> too.</p>
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    1. POAllow only alphanumeric characters for a UITextField
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    1. COThat's really helpful. Only thing I added was ` if ( ( [string isEqualToString:@"@"] ) && (range.location == 0 ) ) { unacceptedInput = [NSCharacterSet characterSetWithCharactersInString:@"@"]; }` inside the emailField branch to prevent @ being used to start an email address
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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