uibutton - What is the equivalent of Android's weightsum in iOS -

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i have bunch of uibutton's want them equally distributed on screen screensizes. possible achieve without using autolayout? view fits on 640*960 screen, if larger there empty space in bottom. there equivalent of weightsum in ios? have attached 2 images shows how view looks on 640*960 (second image) , 640*1136 (first image) screen.

640*1136

640*960

i suggest choose auto layout kind of behaviour. in case pretty straightforward constraints set in ib. if prefer setting code, visual language.

also, me, bit of overkill, may use uicollectionview


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