how to validate a Text field to accept only Characters at run Time in iphone -

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i want validate text field accept characters while typing in it.....

i use following integers guess modify scan strings/chars (see nsscanner):

- (bool)textfield:(uitextfield *)textfield shouldchangecharactersinrange:(nsrange)range replacementstring:(nsstring *)string {  nsstring *resultingstring = [textfield.text stringbyreplacingcharactersinrange: range withstring: string];  // allows backspace if ([resultingstring length] == 0) {     return true; }  nsuinteger holder; nsscanner *scan = [nsscanner scannerwithstring: resultingstring];  return [scan scaninteger: &holder] && [scan isatend]; }

don't forget set uitextfield delegate appropriately :)


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