iOS 字符串转son  json转字符串

+ (NSString*)dictionaryToJson:(NSDictionary *)dic

{

NSError *parseError = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];
    return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

}

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self.dataDic = [NSDictionarydictionaryWithDictionary:responseData[@"data"]];

NSString *jsonString = responseData[@"data"][@"visitRemarks"];
            NSError *err;
            NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
            noteArray = [NSJSONSerialization JSONObjectWithData:jsonData  options:NSJSONReadingMutableContainers error:&err];