ios - Resizing text in UIWebView - Swift 3 -

i having problem, resizing text within uiwebview, html file located within bundle. have managed modified script work within obj-c, using swift 3 there no change text size, although optimal value changes correctly @ each click of button. here code -

import uikit  class viewcontroller: uiviewcontroller {  @iboutlet var reswebview: uiwebview!  @iboutlet weak var increasefont: uibarbuttonitem!  @iboutlet weak var decreasefont: uibarbuttonitem!   var defaults  = ["textfontsize":40]   @ibaction func fontbuttonpressed(sender: uibarbuttonitem) {      var textfontsize = defaults["textfontsize"]      switch sender.tag     {     case 1 : //when decrease         textfontsize  = textfontsize! - 10      case 2 ://when increase         textfontsize = textfontsize! + 50     default:         break     }      defaults["textfontsize"] = textfontsize      print(textfontsize)      var jsstring = "document.getelementsbytagname('body')[0].style.fontsize='\(defaults["textfontsize"])px'"     reswebview.stringbyevaluatingjavascript(from: jsstring) }   override func viewdidload() {     super.viewdidload()      let resfilepath = bundle.main.url(forresource: "resiliencehandbook", withextension: "html");      let resrequest = urlrequest(url: resfilepath!);     reswebview.loadrequest(resrequest);       // additional setup after loading view, typically nib. }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  } 

any pointers gratefully received - thank you

this question answered here:

resizing uiwebview text

however converted in swift3 , tested on xcode8. here code:

class viewcontroller: uiviewcontroller {

@iboutlet weak var webview: uiwebview!  var defaults  = ["textfontsize":12]  override func viewdidload() {     super.viewdidload()      let url = nsurl(string: "https://stackoverflow.com/questions/39638019/resizing-text-in-uiwebview-swift-3")       let urlrequest = nsurlrequest(url: url! url)      webview.loadrequest(urlrequest urlrequest)  }  func changewebviewfontsize(zoominorzoomout: int, webview: uiwebview) {     //1 = decreace     //2 = increace     var textfontsizetemp = defaults["textfontsize"]! int       switch zoominorzoomout     {     case 1: //when decrease         textfontsizetemp  = textfontsizetemp - 20     case 2: //when increase         textfontsizetemp = textfontsizetemp + 20     default:         break     }      defaults["textfontsize"] = textfontsizetemp       let jsstring = "document.getelementsbytagname('body')[0].style.fontsize='\(textfontsizetemp)px'"     webview.stringbyevaluatingjavascript(from: jsstring) }  //uibutton action @ibaction func zoomoutbutton_touchupinside(_ sender: anyobject) {     changewebviewfontsize(zoominorzoomout: 1,webview: webview) }  @ibaction func zoominbutton_touchupinside(sender: anyobject) {     changewebviewfontsize(zoominorzoomout: 2,webview: webview) }