ios - Networking optimization for UITableView -

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i'm writing super simple photo sharing app practice using parse.com server.

i have tableview shows photos user has uploaded server. if nothing persisted , guy has million photos uploaded server, best way fetch photos?

i know simple way make 1 request on viewdidload , store in memory before persisting it. there better way? ideally pull photos in batches, , user scrolled, pull new photos. perhaps there library know of helps this?

if don't want entire thing yourself, should use sdwebimage

a typical code example looks 

[imageview sd_setimagewithurl:[nsurl urlwithstring:@"https://graph.facebook.com/olivier.poitrey/picture"]                  placeholderimage:[uiimage imagenamed:@"avatar-placeholder.png"]                           options:sdwebimagerefreshcached];

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