Add hosting view controller to UIKit View

Question

Created Apr ’22

Replies 1

Boosts 0

Participants 2

Hi All, I am trying to add an UIHostingViewController to my UIViewController, to cover the screen. Unfortunately, I keep getting this error (Thread 1: "NSLayoutConstraint for <_TtGC7SwiftUI19UIHostingControllerV5Pickt10ViewRouter_: 0x7fa32a37c3f0>: Constraint items must each be a view or layout guide.") from my code:

let controller = UIHostingController(rootView: ViewRouter(join: join, create: create, showPicker: showPicker, setMock: setMock))

        controller.view.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(controller.view)

        view.addConstraints([

            NSLayoutConstraint(item: controller,

                               attribute: .top,

                              relatedBy: .equal,

                              toItem: view.safeAreaLayoutGuide,

                              attribute: .top,

                              multiplier: 1,

                              constant: 0),

            NSLayoutConstraint(item: controller,

                               attribute: .leading,

                               relatedBy: .equal,

                               toItem: view.safeAreaLayoutGuide,

                               attribute: .leading,

                               multiplier: 1,

                               constant: 0),

            NSLayoutConstraint(item: controller,

                               attribute: .trailing,

                              relatedBy: .equal,

                              toItem: view.safeAreaLayoutGuide,

                              attribute: .trailing,

                              multiplier: 1,

                              constant: 0),

            NSLayoutConstraint(item: controller,

                               attribute: .bottom,

                              relatedBy: .equal,

                              toItem: view.safeAreaLayoutGuide,

                              attribute: .bottom,

                              multiplier: 1,

                              constant: 0)

          ])

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Answer 1

Frameworks Engineer OP

Apple

May ’22

The error is saying that the item properties in an NSLayoutConstraint must either be a view or a layout guide. In your constraints, you're setting the item to be the view controller itself, when in reality you probably want to pass in the view controller's view.

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