iOS开发之字典(NSDictionary)和JSON字符串(NSString)之间互转

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1. 字典转Json字符串

+ (NSString*)convertToJSONData:(id)infoDict{    NSError *error;    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:infoDict                                                       options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string                                                         error:&error];    NSString *jsonString = @"";    if (! jsonData)     {        NSLog(@"Got an error: %@", error);    }else    {        jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];    }    jsonString = [jsonString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];  //去除掉首尾的空白字符和换行字符    [jsonString stringByReplacingOccurrencesOfString:@"\n" withString:@""];    return jsonString;}

2. JSON字符串转化为字典

+ (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString{    if (jsonString == nil) {        return nil;    }    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];    NSError *err;    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData                                                        options:NSJSONReadingMutableContainers                                                          error:&err];    if(err)    {        NSLog(@"json解析失败：%@",err);        return nil;    }    return dic;}

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