objective c - What grid/view does Instagram use for the feed? -

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i'm in process of emulating instagram application ios using xcode , objective-c. looked around not figure out how instagram implemented following grid feed:

https://debsphuong.files.wordpress.com/2014/10/5-volleyball-hashtag-page.jpg

any insights appreciated it. thank you

that uicollection view. when tap on button turn grid single column grid, cells resized width of view , reloaded again.


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