iOS正则判断元素是否为数字

///正则判断元素是否是数字

• (BOOL)inputShouldNumber:(NSString *)inputString {
  if (inputString.length == 0)
  return NO;
  NSString *regex = @"^[0-9]+([.]{0,1}[0-9]+){0,1}$";
  NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
  return [pred evaluateWithObject:inputString];
  }

特别鸣谢：
http://www.cocoachina.com/bbs/read.php?tid-1706238.html