Hi, I would like to search on a arrays hierachy and display the results on a tableview. The tableview is empty when we run the app and the, when we search it, the data is written. What's the best way to do this? I read tutorials wich explains how it search on a tableview, but i want to search in all of arrays hierachy.

I have 3 classes

class video
    //iVars to allocate the video metadata
    NSInteger videoID; 
    NSString *nameVideo;
    NSString *nameCategory; 
    NSString *nameTopic; 
    NSString *user;
    NSString *date; 
    NSString *description; 
    NSString *urlThumbnail;
    NSString *urlVideo;

class Topic
NSInteger TopicId;
NSString nameTopic;
NSMutableArray videos;

class Category
NSInteger CategoryId;
NSString nameCategory
NSMutableArray topics

AppDelegate
NSMutableArray categories