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具体要求电话号码3位, 7位, 11位中间加入分隔符"-"
//控制textfield输入长度
-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
if (textField == self.newtextfield || textField == self.agenntextfield) {
//这里的if时候为了获取删除操作,如果没有次if会造成当达到字数限制后删除键也不能使用的后果.
if (range.length == 1 && string.length == 0) {
return YES;
}else if (textField.text.length == 11) {
textField.text = [textField.text substringToIndex:11];
[textField resignFirstResponder];
return NO;
}
}
return YES;
}

//当textfield成为第一响应者的时候

• (void)textFieldDidBeginEditing:(UITextField *)textField{
  if ((textField.tag == 1)) {
  NSMutableString * str = [[NSMutableString alloc] initWithString:self.newtextfield.text];
  for (int a = 0; a < str.length; a++) {
  unichar c = [str characterAtIndex:a];
  NSRange range = NSMakeRange(a, 1);
  if (c == '-'){ //此处可以是任何字符
  [str deleteCharactersInRange:range];
  --a;
  }
  }
  self.newtextfield.text = str;
  } else if (textField.tag == 2){
  NSMutableString * str = [[NSMutableString alloc ] initWithString:self.agenntextfield.text];
  for (int a = 0; a < str.length; a++) {
  unichar c = [str characterAtIndex:a];
  NSRange range = NSMakeRange(a, 1);
  if (c == '-'){ //此处可以是任何字符
  [str deleteCharactersInRange:range];
  --a;
  }
  }
  self.agenntextfield.text = str;
  }
  }

//当textfield失去第一响应者的时候触发

• (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
  if (textField.tag == 1) {
  NSMutableString * str = [[NSMutableString alloc] initWithString:self.newtextfield.text];
  [textField resignFirstResponder];
  for (int a = 0; a < str.length; a++) {//加入@"-"
  if (a == 3) {
  [str insertString:@"-" atIndex:a];
  } else if (a == 8){
  [str insertString:@"-" atIndex:a];
  }
  }
  self.newtextfield.text = str;
  } else if (textField.tag == 2){
  NSMutableString * str = [[NSMutableString alloc] initWithString:self.agenntextfield.text];
  [textField resignFirstResponder];
  for (int a = 0; a < str.length; a++) {//加入@"-"
  if (a == 3) {
  [str insertString:@"-" atIndex:a];
  } else if (a == 8){
  [str insertString:@"-" atIndex:a];
  }
  }
  self.agenntextfield.text = str;
  }
  return YES;
  }