All my content was deleted after deleting the game on iOS

I don't quite know which minecraft the iOS one is but, I deleted the minecraft off my iPad then after a while I bought quite a few packs on it, then I tried them out and they were good, but I got tired of the game so I deleted it, then I re-downloaded it but all my content was gone, my packs, skin packs, worlds etc and I don't know how to get it back