ios - UICollectionView, cells are overlapped by Navigation bar -

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enter image description here

want remove space below collectionview cells: 

uicollectionviewflowlayout *flowlayout = [[uicollectionviewflowlayout alloc] init]; [flowlayout setitemsize:cgsizemake(300, 435)]; [flowlayout setminimuminteritemspacing:0.0f]; [flowlayout setminimumlinespacing:20.0f]; [flowlayout setsectioninset:uiedgeinsetsmake(0, 10, 0, 10)];  [flowlayout setscrolldirection:uicollectionviewscrolldirectionhorizontal];  [self.collectionview setcollectionviewlayout:flowlayout];

try adding in -viewdidload:

if ([self respondstoselector:@selector(edgesforextendedlayout)])     self.edgesforextendedlayout = uirectedgenone;

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