ios - nib must contain exactly one top level object which must be a UITableViewHeaderFooterView instance -

i running weird issue when creating customheader tableview. error receiving following:

nib must contain 1 top level object must uitableviewheaderfooterview instance

i ran through code , xib file examples couldnt find wrong ideas missing?

the header xib created regular view , sub view label, class created following:

customtableheader class:

class customtableheader: uitableviewheaderfooterview {     static var customtableheaderidentifier = "customtableheader"     @iboutlet weak var titlelabel: uilabel!      override awakefromnib(){          super.awakefromnib()          self.titlelabel.text = "header"     }      override func prepareforreuse() {         super.prepareforreuse()     } } 

viewcontroller class:

class viewcontroller: uiviewcontroller, uitableviewdelegate, uitableviewdatasource {     @iboutlet weak var tableview: uitableview!      override func viewdidload() {         super.viewdidload()          self.tableview.register(uinib.init(nibname: customtableheader.customtableheaderidentifier, bundle: nil), forheaderfooterviewreuseidentifier: customtableheader.customtableheaderidentifier)     }       //other methods      func tableview(_ tableview: uitableview, viewforheaderinsection section: int) -> uiview? {          if let header = tableview.dequeuereusableheaderfooterview(withidentifier: customtableheader.customtableheaderidentifier) as? customtableheader {             header.titlelabel.text = "section 1"             return header      } } 

i figured out issue! in case ever runs this, make sure first view object in xib file. example on mine trying add gesture header view , considered object well. if want add gesture can programmatically:

addgesturerecognizer(uitapgesturerecognizer(target: self, action: #selector(/* function */)))