iOS WKWebView加载多个#的链接，返回null

#pragma mark ------返回webView可识别的NSURLRequest
-(NSURLRequest *)loadURLwithString:(NSString *)string{
    if ([self getParamByString:string] == 0 || [self getParamByString:string] == 1) {
        return [NSURLRequest requestWithURL:[NSURL URLWithString:string]];
    }else if ([self getParamByString:string] == 2){
//    1、截取第一个？前的字符串
        NSString * str0 = [self subStringWithString:string andIndexStr:@"?" andIndex:1];
        NSLog(@"webstr0 === %@",str0);
//    2、 截取？后面的字符串
        NSString *str1 = [string substringWithRange:NSMakeRange([str0 length]+1, [string length]-[str0 length]-1)];
        str1 = [str1 stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
//    3、 拼接 字符串
        NSString *webUrlStr = [NSString stringWithFormat:@"%@?%@",str0,str1];
        NSLog(@"webUrlStr === %@",webUrlStr);
//    4、将 NSString 转成 NSURL
        NSURL *url = [NSURL URLWithString:webUrlStr];
        NSLog(@"webUrl === %@",url);
//    5、将NSURL 转成 NSURLRequest
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        NSLog(@"webrequest === %@",request);
        return request;
    }else{
        [MBProgressHUD showSuccessMessage:@"暂时不支持该二维码"];
        return nil;
    }
}

#pragma mark =====对#和?号做处理
-(NSInteger)getParamByString:(NSString *)string {
    NSArray *allElements = [string componentsSeparatedByString:@"#"];
    NSArray *questionElements = [string componentsSeparatedByString:@"?"];
    NSLog(@"allElements.count == %lu",(unsigned long)allElements.count);
    NSLog(@"questionElements.count == %lu",(unsigned long)questionElements.count);
    if (allElements.count >questionElements.count) {
        return allElements.count-1;
    }else if (allElements.count

#pragma mark ------ 截取字符串
-(NSString *)subStringWithString:(NSString *)str andIndexStr:(NSString *)indexStr andIndex:(NSInteger)index{
    
    NSString *firstStr = nil;
    NSString *secondStr = nil;
    BOOL isFound = NO;
    NSInteger foundIndex = 0;
    for (int i = 0; i<[str length]; i++) {
        if (isFound == YES && foundIndex == index) {
            return firstStr;
        }
        NSString *temp = [str substringWithRange:NSMakeRange(i, 1)];
        if ([temp isEqualToString:indexStr]) {
            firstStr = [str substringWithRange:NSMakeRange(0, i)];
            secondStr = [str substringWithRange:NSMakeRange(i+1, [str length]-[firstStr length]-1)];
            foundIndex =foundIndex +1;
            isFound = YES;
        }
        //        NSLog(@"第%ld个下标值为%@",(long)i,temp);
    }
    return nil;
}

本文只做记录使用，如果有更好的方法，希望各位不吝赐教！！！