ios - I want UICollectionView grid that has no space on edge cells, only between cells -

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i using uicollectionviewcontroller display grid of photos, , have no spacing on outer boundary of screen; between cells.

so "edge" photos (far left, far right) right against respective edge of screen, there space between cells.

i'm using standard flow layout this, implementing sizeforitematindexpath , insetforsectionatindex methods. i'm hoping don't have custom layouts..

how do this? in advance help.


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