ios - How to switch custom in-app keyboards -

recently i learned make custom in-app keyboards. want able swap between multiple custom keyboards. however, resetting textfield.inputview property not seem work.

i recreated simplified version of problem in following project. uiviews represent actual custom keyboards.

import uikit class viewcontroller: uiviewcontroller {      @iboutlet weak var textfield: uitextfield!      override func viewdidload() {         super.viewdidload()          let blueinputview = uiview(frame: cgrect(x: 0, y: 0, width: 0, height: 300))         blueinputview.backgroundcolor = uicolor.bluecolor()          textfield.inputview = blueinputview         textfield.becomefirstresponder()       }      @ibaction func changeinputviewbuttontapped(sender: uibutton) {          let yellowinputview = uiview(frame: cgrect(x: 0, y: 0, width: 0, height: 300))         yellowinputview.backgroundcolor = uicolor.yellowcolor()          // doesn't cause view switch         textfield.inputview = yellowinputview      } } 

running gives expect: blue input view pops up.

but when tap button switch yellow input view, nothing happens. why? need work?

after little more experimenting have solution now. needed resign first responder , set again. first responder subview of top view can resigned indirectly calling endediting.

@ibaction func changeinputviewbuttontapped(sender: uibutton) {      let yellowinputview = uiview(frame: cgrect(x: 0, y: 0, width: 0, height: 300))     yellowinputview.backgroundcolor = uicolor.yellowcolor()      // first     self.view.endediting(true)     // or     //textfield.resignfirstresponder()      textfield.inputview = yellowinputview     textfield.becomefirstresponder() } 

thanks this , this answer ideas.