ios - Swift: UICollectionView locked to one cell after resizing custom cells -

i'm making custom attending button using uicollectionview 2 custom cells this:

you can either click or drag choose status. when click cell, cells expands screen width, cell clicked visible. can swipe i'm out if change mind. funcitonality works.

i want implement buttons allow swiping follows:

when swipe of button above threshold, button snaps status. however, after snap, not able swipe other cell anymore... can see small portion of when swipe:

the snap functionality done resizing sizes of cells. tried use reloaddata() followed scrollto item swiped to. not possible change cell.

anyone know how this? thanks.

my code - interesting part in scrollviewdidscroll:

class testcontroller: uiviewcontroller, uigesturerecognizerdelegate, uicollectionviewdelegate, uicollectionviewdatasource, uicollectionviewdelegateflowlayout{  var attendingcollectionview: uicollectionview! var imincell: imincustomcollectioncell = imincustomcollectioncell() var imoutcell: imoutcustomcollectioncell = imoutcustomcollectioncell() var hasnotrespondedyet = true var attendingstatus = false var attendingbuttonwidths = uiscreen.main.bounds.width var attendingbuttonheight = 100  override func viewdidload() {     super.viewdidload()     setupcollectionview() }  func setupcollectionview(){     let flowlayout = uicollectionviewflowlayout()     flowlayout.scrolldirection = .horizontal     flowlayout.minimumlinespacing = 0     self.attendingcollectionview = uicollectionview(frame: cgrect(x: 0, y: uiscreen.main.bounds.height-self.attendingbuttonheight, width: uiscreen.main.bounds.width, height: self.attendingbuttonheight), collectionviewlayout: flowlayout)     self.attendingcollectionview.delegate = self     self.attendingcollectionview.datasource = self     self.attendingcollectionview.ispagingenabled = true     self.attendingcollectionview.register(imincustomcollectioncell.self, forcellwithreuseidentifier: "imincell")     self.attendingcollectionview.register(imoutcustomcollectioncell.self, forcellwithreuseidentifier: "imoutcell")     self.attendingcollectionview.isuserinteractionenabled = true     self.attendingcollectionview.showshorizontalscrollindicator = false     view.addsubview(self.attendingcollectionview)     //never responeded before     if self.hasnotrespondedyet {         self.attendingcollectionview.isscrollenabled = true         self.attendingbuttonwidths = self.attendingbuttonwidths/2         self.attendingcollectionview.alwaysbouncehorizontal = true     } }  func collectionview(_ collectionview: uicollectionview, numberofitemsinsection section: int) -> int {     return 2 }  func collectionview(_ collectionview: uicollectionview, cellforitemat indexpath: indexpath) -> uicollectionviewcell {     if indexpath.row == 0 {         let custom = attendingcollectionview.dequeuereusablecell(withreuseidentifier: "imincell", for: indexpath) as! imincustomcollectioncell         imincell = custom         return custom     } else {         let custom = attendingcollectionview.dequeuereusablecell(withreuseidentifier: "imoutcell", for: indexpath) as! imoutcustomcollectioncell         imoutcell = custom         return custom     } }  func scrollviewdidscroll(_ scrollview: uiscrollview) {     let screenwidth = uiscreen.main.bounds.width     let delta = scrollview.contentoffset.x/screenwidth     if delta <= 0{         if delta < -0.15 {             uiview.animate(withduration: 0.3, delay: 0, options: .curveeaseinout, animations: {                 let cell1 = self.imincell                 let cell2 = self.imoutcell                 cell1.frame = cgrect(x: 0, y: 0, width: self.attendingbuttonwidths*2, height: self.attendingbuttonheight)                 cell1.iminlabel.frame = cgrect(x: screenwidth/2-cell1.iminlabel.frame.width/2, y: cell1.iminlabel.frame.miny, width: cell1.iminlabel.frame.width, height: cell1.iminlabel.frame.height)                 cell2.frame = cgrect(x: uiscreen.main.bounds.width, y:0,width: self.attendingbuttonwidths*2,height: self.attendingbuttonheight)                 cell2.imoutlabel.frame = cgrect(x: 10, y: cell2.imoutlabel.frame.miny, width: cell2.imoutlabel.frame.width, height: cell2.imoutlabel.frame.height)                 cell1.iminlabel.textcolor = uicolor.white                 }, completion: { (f) in                     self.attendingcollectionview.isscrollenabled = true                     self.attendingcollectionview.ispagingenabled = true                     self.hasnotrespondedyet = false             })         }     } }  func collectionview(_ collectionview: uicollectionview, layout collectionviewlayout: uicollectionviewlayout, sizeforitemat indexpath: indexpath) -> cgsize{     if self.hasnotrespondedyet {         return cgsize(width: self.attendingbuttonwidths, height: attendingcollectionview.frame.size.height)     } else {         return cgsize(width: self.attendingbuttonwidths, height: attendingcollectionview.frame.size.height)     } } 

}

class imincustomcollectioncell: uicollectionviewcell {  var iminlabel: uilabel! override init(frame: cgrect){     super.init(frame: frame)     self.iminlabel = uilabel(frame: self.frame)     self.iminlabel.text = "i'm in"     self.iminlabel.sizetofit()     self.iminlabel.frame = cgrect(x: self.frame.width/2-self.iminlabel.frame.width/2, y: self.frame.height/2-self.iminlabel.frame.height/2, width: self.iminlabel.frame.width, height: self.iminlabel.frame.height)     addsubview(self.iminlabel) } required init?(coder adecoder: nscoder) {     fatalerror("init(coder:) has not been implemented") } 

}

class imoutcustomcollectioncell: uicollectionviewcell {}//similar logic above