iOS 判断名称是否合法

/**
 *  判断名称是否合法
 *
 *  @param name 名称
 *
 *  @return yes / no
 */
BOOL isNameValid(NSString *name)
{
    BOOL isValid = NO;
    
    if (name.length > 0)
    {
        for (NSInteger i=0; i<name.length; i++)
        {
            unichar chr = [name characterAtIndex:i];
            
            if (chr < 0x80)
            { //字符
                if (chr >= 'a' && chr <= 'z')
                {
                    isValid = YES;
                }
                else if (chr >= 'A' && chr <= 'Z')
                {
                    isValid = YES;
                }
                else if (chr >= '0' && chr <= '9')
                {
                    isValid = YES;
                }
                else if (chr == '-' || chr == '_')
                {
                    isValid = YES;
                }
                else
                {
                    isValid = NO;
                }
            }
            else if (chr >= 0x4e00 && chr < 0x9fa5)
            { //中文
                isValid = YES;
            }
            else
            { //无效字符
                isValid = NO;
            }
            
            if (!isValid)
            {
                break;
            }
        }
    }
    
    return isValid;
}