UIView-Encapsulated-Layout-Width zero for override loadView in UIViewController subclass











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I have a weird problem when I create view for UIViewController manually, not by storyboard.
This code will break constraint with reason UIView-Encapsulated-Layout-Width is zero.



class MainViewController: UIViewController {

    let mainView = MainView()



    override func loadView() {

        view = mainView

    }

}


This code is ok:



class MainViewController: UIViewController {

    let mainView = MainView()



    override func viewDidLoad() {

        view.addSubview(mainView)

        mainView.translatesAutoresizingMaskIntoConstraints = false

        mainView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true

        mainView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

        mainView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true

        mainView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true

    }

}


I thought they’re same, and I want to use the first solution. But it’s not ok. What is the problem?






ios uiviewcontroller autolayout







share|improve this question


























    up vote
    0
    down vote

    favorite












    I have a weird problem when I create view for UIViewController manually, not by storyboard.
    This code will break constraint with reason UIView-Encapsulated-Layout-Width is zero.



    class MainViewController: UIViewController {
    
    let mainView = MainView()
    

    
    override func loadView() {
    
        view = mainView
    
    }
    
}


    This code is ok:



    class MainViewController: UIViewController {
    
    let mainView = MainView()
    

    
    override func viewDidLoad() {
    
        view.addSubview(mainView)
    
        mainView.translatesAutoresizingMaskIntoConstraints = false
    
        mainView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
    
        mainView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    
        mainView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
    
        mainView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
    
    }
    
}


    I thought they’re same, and I want to use the first solution. But it’s not ok. What is the problem?






    ios uiviewcontroller autolayout







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a weird problem when I create view for UIViewController manually, not by storyboard.
      This code will break constraint with reason UIView-Encapsulated-Layout-Width is zero.



      class MainViewController: UIViewController {
      
    let mainView = MainView()
      

      
    override func loadView() {
      
        view = mainView
      
    }
      
}


      This code is ok:



      class MainViewController: UIViewController {
      
    let mainView = MainView()
      

      
    override func viewDidLoad() {
      
        view.addSubview(mainView)
      
        mainView.translatesAutoresizingMaskIntoConstraints = false
      
        mainView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
      
        mainView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
      
        mainView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
      
        mainView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
      
    }
      
}


      I thought they’re same, and I want to use the first solution. But it’s not ok. What is the problem?






      ios uiviewcontroller autolayout







      share|improve this question













      I have a weird problem when I create view for UIViewController manually, not by storyboard.
      This code will break constraint with reason UIView-Encapsulated-Layout-Width is zero.



      class MainViewController: UIViewController {
      
    let mainView = MainView()
      

      
    override func loadView() {
      
        view = mainView
      
    }
      
}


      This code is ok:



      class MainViewController: UIViewController {
      
    let mainView = MainView()
      

      
    override func viewDidLoad() {
      
        view.addSubview(mainView)
      
        mainView.translatesAutoresizingMaskIntoConstraints = false
      
        mainView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
      
        mainView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
      
        mainView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
      
        mainView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
      
    }
      
}


      I thought they’re same, and I want to use the first solution. But it’s not ok. What is the problem?






      ios uiviewcontroller autolayout




      ios uiviewcontroller autolayout






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 9 at 4:33









      vietstone

      4,101124066




      4,101124066





























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