iphone - UIImageView shadow not being drawn first time cell is visible -


i have uicollectionview customcell has uiimageview i'm adding shadow to. however, shadow not being drawn before cell has been "outside" visible collection view , comes (uicollection)view. 

-(uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {  static nsstring *cellidentifier = @"genrecell";  genreviewcell *cell = [collectionview dequeuereusablecellwithreuseidentifier:cellidentifier forindexpath:indexpath];  cell.genreimageview.layer.shadowradius = 1.5; cell.genreimageview.layer.shadowoffset = cgsizemake(-1, -1); cell.genreimageview.layer.shadowopacity = 0.5; cell.genreimageview.layer.shadowcolor = [uicolor blackcolor].cgcolor;  cell.genreimageview.layer.shadowpath = [uibezierpath bezierpathwithrect:cell.genreimageview.bounds].cgpath;  return cell;  }

is there reason setting shadowpath property? since want set shadow bounds of image view itself, shouldn't have that. remove line.

also, prevent lag:

cell.genreimageview.layer.shouldrasterize = yes; cell.genreimageview.layer.rasterizationscale = [[uiscreen mainscreen] scale];

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