ios - Program UICollectionViewCell Programmatically -


i trying create cell programmatically without using story board, stumble upon problems. cell code following. 

import uikit  class productcategorycollectionviewcell: uicollectionviewcell {   required init?(coder adecoder: nscoder) {     super.init(coder: adecoder)     self.setupcell() }   var productcategoryimageview :uiimageview!  func setupcell(){     //seting imageview subview     productcategoryimageview = uiimageview()     productcategoryimageview.translatesautoresizingmaskintoconstraints = false     let subviewdictionary = ["productcategoryimageviewkey" : productcategoryimageview]       let productcategoryimageviewwidth = contentview.bounds.size.width     let productcategoryimageviewheight = contentview.bounds.size.height     let productcategoryimageviewhorizontalconstrain = nslayoutconstraint.constraintswithvisualformat("h:[productcategoryimageviewkey(\(productcategoryimageviewwidth))]", options: nslayoutformatoptions(rawvalue: 0), metrics: nil, views: subviewdictionary)     let productcategoryimageviewverticalconstrain = nslayoutconstraint.constraintswithvisualformat("v:[productcategoryimageviewkey(\(productcategoryimageviewheight))]", options: nslayoutformatoptions(rawvalue: 0), metrics: nil, views: subviewdictionary)      productcategoryimageview.addconstraints(productcategoryimageviewhorizontalconstrain)       productcategoryimageview.addconstraints(productcategoryimageviewverticalconstrain)        contentview.addsubview(productcategoryimageview)     contentview.backgroundcolor = uicolor(red: 1, green: 0, blue: 0, alpha: 0.4) }

}

i trying create subimageview size of cell, however, doesn't scale to size of cell.

the size of cell not known when init method called. setting width , height contentview.bounds.size.width , contentview.bounds.size.height won't work.

instead of adding constraints horizontal , vertical sizes can add left, right, top , bottom constraints, this:

let productcategoryimageviewhorizontalconstrain = nslayoutconstraint.constraintswithvisualformat("h:|-0-[productcategoryimageviewkey]-0-|", options: nslayoutformatoptions(rawvalue: 0), metrics: nil, views: subviewdictionary) let productcategoryimageviewverticalconstrain = nslayoutconstraint.constraintswithvisualformat("v:|-0-[productcategoryimageviewkey]-0-|", options: nslayoutformatoptions(rawvalue: 0), metrics: nil, views: subviewdictionary)

and should call contentview.addsubview(productcategoryimageview) before adding constraints.


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