ios 从URL中截取所包含的参数,并且以字典的形式返回和参数字典转URL

//字典转链接（参数）

- (NSString *)keyValueStringWithDict:(NSDictionary *)dict

{
    if (dict == nil) {
        return nil;
    }
    NSMutableString *string = [NSMutableString stringWithString:@"?"];
    [dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        [string appendFormat:@"%@=%@&",key,obj];
    }];

    if ([string rangeOfString:@"&"].length) {
        [string deleteCharactersInRange:NSMakeRange(string.length - , )];
    }

    return string;
}

//链接转字典  （参数）
-(NSDictionary *)dictionaryWithUrlString:(NSString *)urlStr
{
    if (urlStr && urlStr.length && [urlStr rangeOfString:@"?"].length == ) {
        NSArray *array = [urlStr componentsSeparatedByString:@"?"];
        if (array && array.count == ) {
            NSString *paramsStr = array[];
            if (paramsStr.length) {
                NSMutableDictionary *paramsDict = [NSMutableDictionary dictionary];
                NSArray *paramArray = [paramsStr componentsSeparatedByString:@"&"];
                for (NSString *param in paramArray) {
                    if (param && param.length) {
                        NSArray *parArr = [param componentsSeparatedByString:@"="];
                        if (parArr.count == ) {
                            [paramsDict setObject:parArr[] forKey:parArr[]];
                        }
                    }
                }
                return paramsDict;
            }else{
                return nil;
            }
        }else{
            return nil;
        }
    }else{
        return nil;
    }
}

//特殊链接解析不了 。  'https://wwww.baidu.com/#/sdffff?name=sdfff&pass=dddff'
/**
 获取url的所有参数
 @param url 需要提取参数的url
 @return NSDictionary
 */
-(NSDictionary *) parameterWithURL:(NSURL *) url {

    NSMutableDictionary *parm = [[NSMutableDictionary alloc]init];

    //传入url创建url组件类
    NSURLComponents *urlComponents = [[NSURLComponents alloc] initWithString:url.absoluteString];

    //回调遍历所有参数，添加入字典
    [urlComponents.queryItems enumerateObjectsUsingBlock:^(NSURLQueryItem * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        [parm setObject:obj.value forKey:obj.name];
    }];

    return parm;
}