Ytukyg

Basically, I have a tableview and when I switch to landscape I want it to set the table view to fullscreen and when I switch it back to portrait, it should revert to default constraints. It works if I remove the breakpoint.

However, when I switch it back from landscape to portrait, it does not return to default. When I switch it back to portrait, I am editing the constraints for it to do what I want. However, I am open to other solutions. Please advise me on what I should do. I added the breakpoint using UIViewAlertForUnsatisfiableConstraints just like this image:

override func viewDidLoad() {

   super.viewDidLoad()

   parseData(noOfPosts:90)



   TableView.delegate = self

   TableView.dataSource = self

   TableView.tableFooterView = UIView()



   let myTop2Constraint:NSLayoutConstraint = TableView.topAnchor.constraint(equalTo: view.topAnchor, constant: 50)

   let myBtm2Constraint:NSLayoutConstraint = TableView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 50)



   myTop2Constraint.isActive = true

   myBtm2Constraint.isActive = true



   if(UIDevice.current.orientation.isLandscape){

      myTop2Constraint.isActive = false

      myBtm2Constraint.isActive = false

   }

}



override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {

   let myTop2Constraint:NSLayoutConstraint = TableView.topAnchor.constraint(equalTo: view.topAnchor, constant: 50)

   let myBtm2Constraint:NSLayoutConstraint = TableView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 50)

   let myTopConstraint:NSLayoutConstraint = TableView.topAnchor.constraint(equalTo: view.topAnchor, constant: 0)

   let myBtmConstraint:NSLayoutConstraint = TableView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0)



   myTopConstraint.isActive = false

   myBtmConstraint.isActive = false

   myTop2Constraint.isActive = false

   myBtm2Constraint.isActive = false



   if(UIDevice.current.orientation.isLandscape){

      self.catIsuSemasa.isHidden = true

      self.catOthers.isHidden = true

      self.catSocial.isHidden = true

      self.catPolitics.isHidden = true

      if(myTop2Constraint.isActive){

         print("error1?")

         myTop2Constraint.isActive = false

         print("error2?")

         myBtm2Constraint.isActive = false

         print("error3?")

         myTopConstraint.isActive = true

         myBtmConstraint.isActive = true

      }else{

         TableView.removeAllConstraints()

         myTopConstraint.isActive = true

         myBtmConstraint.isActive = true

      }

   }else{

      self.catIsuSemasa.isHidden = false

      self.catOthers.isHidden = false

      self.catSocial.isHidden = false

      self.catPolitics.isHidden = false

      if(myTopConstraint.isActive){

         print("error")

         myTopConstraint.isActive = false

         print("error2")

         myBtmConstraint.isActive = false

         print("error3")

         myTop2Constraint.isActive = true

         print("error4")

         myBtm2Constraint.isActive = true

         print("run?")

      }

   }

}



extension UIView {

    func removeAllConstraints() {

        self.removeConstraints(self.constraints)

        for view in self.subviews {

            view.removeAllConstraints()

        }

    }

}

App support landscape and portrait then we do not required set constrain programatically we can achieve same thing by using storyboard's size class (vary for traits). By using size class we can create adaptive layout design. we can set different constrain for landscape and portrait app.

Please check below tutorial link :

Tutorial Link