ios - How can I create 3 columns using UICollectionView -

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i want create 3 columns uicollectionview, here code did: have attached uicollectionviewflowlayout uicollectionview , set itemsize collection view's width divides 3:

    self.collectionview.backgroundcolor =  [uicolor bluecolor];      uicollectionviewflowlayout *flowlayout = [[uicollectionviewflowlayout alloc] init];      double width = self.collectionview.frame.size.width;     width /= 3;     [flowlayout setitemsize:cgsizemake(width, 100)];     [flowlayout setscrolldirection:uicollectionviewscrolldirectionhorizontal];      [self.collectionview setcollectionviewlayout:flowlayout];

but when run it, see 1 item per row width of item set correctly. right of item bunch of white spaces.

can please tell me missing?

thank you.

update:

i have tried minimum spacing set. still not work. see 1 column of cells:

self.collectionview.backgroundcolor =  [uicolor bluecolor]; uicollectionviewflowlayout *flowlayout = [[uicollectionviewflowlayout alloc] init];  [flowlayout setitemsize:cgsizemake(160, 160)]; [flowlayout setscrolldirection:uicollectionviewscrolldirectionhorizontal]; flowlayout.minimuminteritemspacing = 10.0f; flowlayout.minimumlinespacing = 10.0f;  [self.collectionview setcollectionviewlayout:flowlayout];

when adjust spacing values in code, see spacing on screen changes. layout cell in 1 column. instead of 2

while creating uicollectionviewlayout should specify itemsize, minimuminteritemspacing , minimumlinespacing , optionally scrolling direction using information collection view layout items.


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