ios - 我如何使用 NSJSONSerialization 与特殊字符，如 "ñ"？

Question

我正在使用 NSJSONSerialization 来解析 Google 的建议。

查询“f”返回这些建议:

["f",["facebook","flipkart","fox news","forever 21","friv","fandango","fedex","fitbit","food near me","flights"]]

解析器工作正常，但是当查询“fac”有特殊字符如“ñ”时:

["fac",["facebook","facebook search","fac","facebook app","facebook lite","facebook login","facebook logo","facebook messenger","facetime","facebook en español"]]

它抛出一个异常:

Error Domain=NSCocoaErrorDomain Code=3840 "Unable to convert data to string around character 139." UserInfo={NSDebugDescription=Unable to convert data to string around character 139.}

有什么想法吗？我尝试了所有不同的阅读选项，但没有一个有效。

#pragma mark -

- (void)request:(NSString *)text
{
    NSMutableArray *items = [[NSMutableArray alloc] init];

    NSString *query = [text stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

    NSString *languageCode = [[NSLocale preferredLanguages] firstObject];

    if (!languageCode) {

        languageCode = @"en";
    }

    NSString *URLString = [NSString stringWithFormat:@"http://suggestqueries.google.com/complete/search?q=%@&client=firefox&hl=%@", query, languageCode];

    NSError *downloadError = nil;

    NSData *JSONData = [NSData dataWithContentsOfURL:[NSURL URLWithString:URLString] options:0 error:&downloadError];

    if (!downloadError && JSONData) {

        NSError *parseError = nil;

        id object = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableContainers error:&parseError];

        if (!parseError && object) {

            if ([object isKindOfClass:[NSArray class]]) {

                NSArray *objects = (NSArray *)object;

                NSArray *texts = [objects objectAtIndex:1];

                for (NSString *text in texts) {

                    SNGoogleItem *item = [[SNGoogleItem alloc] initWithText:text];

                    [items addObject:item];
                }

                [_delegate google:self didRespondWithItems:items];
            }
            else {

                [_delegate google:self didRespondWithItems:items];
            }
        }
        else {

            [_delegate google:self didRespondWithItems:items];
        }
    }
    else {

        [_delegate google:self didRespondWithItems:items];
    }
}

Answer 1

JSONSerialization 支持 JSON 规范中的所有编码，说 Apple documentation .

您没有提供有关数据编码方案的太多信息，但我猜您使用的是 nonLossyASCII 或类似的东西，JSONSerialization 不支持它。

以下是我将数据与 JSON 相互转换的方法:

let rawString = "[[\"facebook en español\"]]"
// if I use String.Encoding.nonLossyASCII below, I get the error you are getting
let data = rawString.data(using: String.Encoding.utf8)
let dict = try! JSONSerialization.jsonObject(with: data!)
let convertedData = try! JSONSerialization.data(withJSONObject: dict)
let convertedString = String(data: convertedData, encoding: String.Encoding.utf8)!
// now convertedString contains "ñ" character