ios - Set view controllers of UITabBarController in Swift -

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i trying programatically set view controllers of custom tabbarcontroller:

import uikit  class tabbarviewcontroller: uitabbarcontroller, uitabbarcontrollerdelegate {  var cameraviewcontroller: uiviewcontroller? var profileviewcontroller: uiviewcontroller?  override func viewdidload() {     super.viewdidload()      self.delegate = self       //self.viewcontrollers = [cameraviewcontroller, profileviewcontroller] as! [anyobject]?     let controllers: [uiviewcontroller?] = [cameraviewcontroller, profileviewcontroller]     self.setviewcontrollers(controllers as! [anyobject], animated: true)  }

but line

self.viewcontrollers = [cameraviewcontroller, profileviewcontroller] as! [anyobject]?

i error cannot convert [uiviewcontroller] [anyobject?]

and line

self.setviewcontrollers(controllers as! [anyobject], animated: true)

i error saying:

cannot invoke 'setviewcontrollers' argument list of type '([anyobject], animated: bool)'

my problem anyobject , typecasting guess.

the problem view controllers trying use declared optional:

var cameraviewcontroller: uiviewcontroller? var profileviewcontroller: uiviewcontroller?

so have 3 options:

  • don't make them optional. requires initialize them when initalize tabbarviewcontroller. maybe safest option.

  • if know cameraviewcontroller , profileviewcontroller never nil in viewdidload:

    self.viewcontrollers = [cameraviewcontroller!, profileviewcontroller!]

  • check if cameraviewcontroller , profileviewcontroller not nil in viewdidload. smells bad design me though.

    if let c = cameraviewcontroller, let p = profileviewcontroller {     self.viewcontrollers = [c, p] }

so boils down how initialize cameraviewcontroller , profileviewcontroller. set before tab bar view controllers shown? if so, recommend adding custom init class.


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