iOS Json的解析與創建

+ (NSString )voiceMessageConentWithEntity:(VMessageEntity )entity{


NSLog(@"entity.voiceMessage.voicemd5 == %@",entity.voiceMessage.voicemd5);

if (!entity) {

    return nil;

}

VChatVoiceEntity *voiceMessage = entity.voiceMessage;

if (!voiceMessage) {

    return nil;

}

NSString *voicemd5 = voiceMessage.voicemd5;

NSString *duration = voiceMessage.duration;

if (entity.messageType == VMessageTypeVoice) {

    NSMutableDictionary *rootDict = [NSMutableDictionary dictionary];

    if (voicemd5) {

        [rootDict setObject:voicemd5 forKey:@"md5"];

    }

    if (duration) {

        [rootDict setObject:duration forKey:@"duration"];

    }

   NSError *error = nil;

    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:rootDict options:NSJSONWritingPrettyPrinted error:&error];

    if (error) {

        NSLog(@"%@", error);

    }

    NSString *json = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

    return json;

}else{

    return nil;

}



}

(VChatVoiceEntity )voiceWithJson:(NSString )json{
if (!json.length) {

  return nil;


}
NSData *jsonData = [json dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *root = [NSJSONSerialization JSONObjectWithData:jsonData

                                                   options:NSJSONReadingMutableLeaves

                                                     error:&error];


if (root) {

  VChatVoiceEntity *voiceMessage = [[VChatVoiceEntity alloc] init];

  voiceMessage.voicemd5 = [root objectForKey:@"md5"];

  voiceMessage.duration = [root objectForKey:@"duration"];

  return voiceMessage;


}
return nil;


}</pre>