iOS开发 判断扫码是否为有效网址

- (BOOL)achiveStringWithWeb:(NSString *)infor

{

  NSString *emailRegex = @"[a-zA-z]+://.*";

  NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

  return [emailTest evaluateWithObject:infor];

}