ยังไงเพื่อเพิ่ม undelete ข้อความต้อง textfield ใน ios

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ยังไงเพื่อเพิ่ม undelete ข้อความต้อง textfield ใน ios

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if (textField.text.length == 1 && [string isEqualToString:@""]) {//When detect backspace when have one character. 
        textField.text = @"myText";
    }
    return YES;
}

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