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    <p>Just to clarify: As a user enters a phone number into a UITextField, you would like it to automatically insert dashes in the proper places.</p> <p>The answer is in using the UITextFieldDelegate protocol. </p> <p>1) Set your controller object as a delegate for the UITextField.</p> <p>2) You'll find the following method in the protocol:</p> <pre><code>- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string </code></pre> <p>This method is called every time a character change occurs in the text field.</p> <p>3) How robust you want your implementation to be is up to you. You could simply do a count of the current characters and insert dashes after 3 and 6 characters. It would be wise to also reject any non-numeric characters.</p> <p>Here is a sample implementation. We basically take over the field editing manually - Inserting dashes after the appropriate string lengths and making sure the user can only enter numbers:</p> <pre><code>- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSCharacterSet *numSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789-"]; NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string]; int charCount = [newString length]; if ([newString rangeOfCharacterFromSet:[numSet invertedSet]].location != NSNotFound || [string rangeOfString:@"-"].location != NSNotFound || charCount &gt; 12) { return NO; } if (charCount == 3 || charCount == 7) { newString = [newString stringByAppendingString:@"-"]; } textField.text = newString; return NO; } </code></pre>
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    1. POhow to can i display mobile number in 123-456-7890 format in textfield
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    1. USMatthew McGoogan
    1. USMatthew McGoogan
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    1. POhow to can i display mobile number in 123-456-7890 format in textfield
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    1. COThank u Matthew Mc Googan,If i use this when i there is case the user enter mistake,if he want's remove then - symbol is not removed.i mean 123-456-7890 in this number, upto 123-456- is removed - is not removed,I am very thankful if i got solution for this also
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      1. USMaheshBabu
    2. COYeah, @MaheshBabu is right. You need to add the following to the top of function: `if ([string isEqualToString:@""]) { return YES; }`
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      1. USivanzoid
    3. COIs there a way to deal with backspace? When you try to delete a dash it adds another one because it's at that character count for appending a dash.
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      1. USAlex L
 

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