ios - How to set dynamic UICollectionView cell height? -

-

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.


Comments

Post a Comment

Popular posts from this blog

Hatching array of circles in AutoCAD using c# -

-
i beginner in autocad plugins .i have created array of circle using following code. now, have hatch circles in array .how that??how hatch circles @ once? moreover, how can return hatch method , use hatch objects.sorry language.thanks in advance. [assembly: commandclass(typeof(beamsection.class1))] namespace beamsection { public class class1 { //class1 obj = new class1(); [commandmethod("beamatsupport")] public void addlightweightpolyline() { // current document , database document acdoc = application.documentmanager.mdiactivedocument; database accurdb = acdoc.database; promptpointresult ppr = acdoc.editor.getpoint("\nselect starting point "); var ucs = acdoc.editor.currentusercoordinatesystem; point3d startingpt = ppr.value.transformby(ucs); list<double> radius = new list<double>(); radius.add(0.5);
Read more

ios - UITEXTFIELD InputView Uipicker not working in swift -

-
hello trying pop uipickerview view programmatically when user clicks on textfield. have tried doesn't doing anything. isn't working. nothing happening when click textfield class userprofiletableviewcontroller: uitableviewcontroller,uitextfielddelegate,uipickerviewdelegate,uipickerviewdatasource { var itempicker: uipickerview! = uipickerview() @iboutlet weak var gendertxtfield: uitextfield! var gender = ["male","female"] override func viewdidload() { super.viewdidload() gendertxtfield.delegate = self itempicker!.delegate = self itempicker!.datasource = self itempicker!.backgroundcolor = uicolor.blackcolor() self.gendertxtfield.inputview = itempicker } func numberofcomponentsinpickerview(pickerview: uipickerview) -> int{ return 1 } // returns # of rows in each component.. func pickerview(pickerview: uipickerview, numberofrowsincomponent component:
Read more