ios - How to set dynamic UICollectionView cell height? -

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how set dynamic cell height?

i need set cell size in method: 

func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell

i try this: 

cell.bounds = cgrect(x: cell.bounds.origin.x, y: cell.bounds.origin.y, width: width, height: height)

but can't scrool down...

and try methiod:

func collectionview(collectionview: uicollectionview, layout collectionviewlayout: uicollectionviewlayout, sizeforitematindexpath indexpath: nsindexpath) -> cgsize

but method ben call first, call method:

cell.bounds = cgrect(x: cell.bounds.origin.x, y: cell.bounds.origin.y, width: width, height: height)

so.. how change cell height?

firstly, set per normal. (normal constraints [left,right,top,bottom, , height] , iboutlet uicollectionview.

secondly, make iboutlets height constraint, top constraint, , bottom constraint.

thirdly, add -> 

//these outlets naming generic names name them wish   iboutlet var collectionviewcelldynamicconstraint: nslayoutconstraint!  iboutlet var topconstraintdynamicconstraint: nslayoutconstraint!  iboutlet var bottomconstraintdynamicconstraint: nslayoutconstraint!   //into viewdidload   collectionviewcell.addobserver(self, forkeypath: "contentheight",      options:nskeyvalueobservingoptions.new, context: nil)    topconstraintdynamicconstraint.addobserver(self, forkeypath: "contenttop", options:nskeyvalueobservingoptions.new, context: nil)    bottomconstraintdynamicconstraint.addobserver(self, forkeypath: "contentbottom", options:nskeyvalueobservingoptions.new, context: nil)   //create override func   override func observevalueforkeypath(keypath: string?, ofobject object: anyobject?, change: [string : anyobject]?, context: unsafemutablepointer<void>) {     //try use segment below if doesn't work remove , try run again   self.collectionviewcell.sizethatfits()   //     self.collectionviewcelldynamicconstraint.constant = collectionviewcell.sizethatfits(cgsizemake(self.collectionviewcell.frame.size.width, cgfloat.max)).height   // set these values (below) space/value set them @ normally. needed refresh after changing height of view/collectionviewcell      self.topspaceold.constant = 0.4       self.bottomspaceold.constant = 10   }      // need de-initialise them before leave view or else crash deinit {     self.collectionviewcell.removeobserver(self, forkeypath: "contentheight")      self.topconstraintdynamicconstraint.removeobserver(self, forkeypath: "contenttop"      self.bottomconstraintdynamicconstraint.removeobserver(self, forkeypath: "contentbottom")  )    }

there might naming issues should work. code worked getting uitextview work inside of scroll view dynamic height of view. should same concept.


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