ios - How can I programmatically make a UICollectionView fill a UITableViewCell? -


i'm trying simple, keep getting errors.

i have uitableview multiple sections. each section has header , 1 uitableviewcell. within each cell uicollectionview. of these views must created programmatically (no storyboard solutions whatsoever please).

the problem when try size , position uicollectionview. uicollectionview fill entire uitableviewcell, @ first tried size uicollectionview in uitableviewcell's init method using self.frame so: 

 var collectionview: uicollectionview? let collectionviewlayout: uicollectionviewflowlayout!  override init(style: uitableviewcellstyle, reuseidentifier: string?) {          self.collectionviewlayout = uicollectionviewflowlayout()         self.collectionviewlayout.sectioninset = uiedgeinsets(top: 1.0, left: 1.0, bottom: 1.0, right: 1.0)         self.collectionviewlayout.scrolldirection = .vertical          super.init(style: style, reuseidentifier: reuseidentifier)          let frame = cgrect(x: 0.0, y: 0.0, width: self.frame.width, height: self.frame.height)         self.collectionview = uicollectionview(frame: frame, collectionviewlayout: self.collectionviewlayout)          self.collectionview?.datasource = self         self.collectionview?.delegate = self }

however, think uitableviewcell's frame not set @ time (the init method call), , uicollectionview sized improperly. correct?

next, tried using layout anchors, so: 

collectionview?.bottomanchor.constraint(equalto: self.bottomanchor).isactive = true

this gave me layout constraint error , said 'uicollectionviewproject[63851:2306772] [layoutconstraints] unable simultaneously satisfy constraints.' don't understand how thats possible. added 1 constraint, there nothing in storyboard, constraints possibly breaking?

somehow need make uicollectionview same size uitableviewcell , fit inside perfectly. again, must done programmatically only, no storyboards. please let me know need do. thanks.

in code have added 1 constraint - bottomanchor. autolayout doesn't work that. add required constraints after adding uicollectionview subview of uitableviewcell, i.e.

override init(style: uitableviewcellstyle, reuseidentifier: string?) {     super.init(style: style, reuseidentifier: reuseidentifier)      self.collectionviewlayout = uicollectionviewflowlayout()     self.collectionviewlayout.sectioninset = uiedgeinsets(top: 1.0, left: 1.0, bottom: 1.0, right: 1.0)     self.collectionviewlayout.scrolldirection = .vertical      let frame = cgrect(x: 0.0, y: 0.0, width: self.frame.width, height: self.frame.height)     self.collectionview = uicollectionview(frame: frame, collectionviewlayout: self.collectionviewlayout)     self.collectionview?.translatesautoresizingmaskintoconstraints = false     self.addsubview(self.collectionview!)      nslayoutconstraint.activate([         self.collectionview!.topanchor.constraint(equalto: self.topanchor),         self.collectionview!.bottomanchor.constraint(equalto: self.bottomanchor),         self.collectionview!.leftanchor.constraint(equalto: self.leftanchor),         self.collectionview!.rightanchor.constraint(equalto: self.rightanchor),         ])      self.collectionview?.datasource = self     self.collectionview?.delegate = self }

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