Xcode - JSON 中的特殊字符

Question

我正在通过 JSON 从网站加载数据库。当我下载数据库时，我使用 UTF8 使所有字符正确显示，当我对它们进行 NSLOG 处理时，它们都按原样显示。但是当我使用 JSON 分析数据然后尝试过滤掉一些单词时，带有特殊字符的单词变成了这样：“H\U00f6ghastighetst\U00e5g”，它应该说：“Höghastighetståg”。

我试图找到一种方法让代码在过滤后将文本转换回 UTF8，但不知何故我无法实现。对一些答案真的很有帮助。

NSError *error;
 NSString *url1 = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.pumba.se/example.json"] encoding:NSUTF8StringEncoding error:&error];

NSLog(@"Before converting to NSData: %@", url1);

NSData *allCoursesData = [url1 dataUsingEncoding:NSUTF8StringEncoding];


NSMutableDictionary *JSONdictionary = [NSJSONSerialization
                                       JSONObjectWithData:allCoursesData
                                       options:kNilOptions
                                       error:&error];
if( error )
{
    NSLog(@"%@", [error localizedDescription]);
}
else {
    NSMutableArray *allNames = [NSMutableArray array];
    NSArray* entries = [JSONdictionary valueForKeyPath:@"hits.hits"];

    for (NSDictionary *hit in entries) {
        NSArray *versions = hit[@"versions"];
        for (NSDictionary *version in versions) {
            NSDictionary *properties = version[@"properties"];
            NSString *status = [properties[@"Status"] firstObject];
            NSString *name = [properties[@"Name"] firstObject];
            if ([status isEqualToString:@"usable"]) {
                [allNames addObject:name];
            }
        }
    }

    NSLog(@"All names: %@", allNames);
}}

Answer 1

试试

+ (NSString *)utf8StringEncoding:(NSString *)message
{
    NSString *uniText = [NSString stringWithUTF8String:[message UTF8String]];
    NSData *msgData = [uniText dataUsingEncoding:NSNonLossyASCIIStringEncoding];
    message = [[NSString alloc] initWithData:msgData encoding:NSUTF8StringEncoding];
    return message;
}

或

+ (NSString *)asciiStringEncoding:(NSString *)message
{
    const char *jsonString = [message UTF8String];
    NSData *jsonData = [NSData dataWithBytes:jsonString length:strlen(jsonString)];
    message = [[NSString alloc] initWithData:jsonData encoding:NSNonLossyASCIIStringEncoding];
    return message;
}

这段代码可以帮助你

+ (NSDictionary *)jsonStringToObject:(NSString *)jsonString
{
    NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *jsonResponse;
    if (data)
        jsonResponse = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

    return jsonResponse;
}

+ (NSString *)objectToJsonString:(NSDictionary *)dict
{
    NSError *error;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];
    if (jsonData.length > 0 && !error)
    {
        NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
        return jsonString;
    }
    return nil;
}