Beagle View

On this section, you find informations about Beagle View for iOS and how to use it.


Beagle View is an UIView that must be used when it is necessary to add a Beagle’s component in a native screen that has other views and use AutoLayout.

Using a Beagle View

Creating an AutoLayout

Check out below a native layout that can be used as an example of AutoLayout use with Beagle:

struct AutoLayoutComponent: ServerDrivenComponent {
    var widgetProperties: WidgetProperties = WidgetProperties()
    func toView(renderer: BeagleRenderer) -> UIView {
        return AutoLayoutWrapper(view: AutoLayoutSample())

class AutoLayoutSample: UIView {
    let constraintView: UIView
    let heightConstraint: NSLayoutConstraint
    override init(frame: CGRect) {
        let view = UIView()
        self.constraintView = view
        self.heightConstraint = view.heightAnchor.constraint(equalToConstant: 100)
        super.init(frame: frame)
        backgroundColor = .yellow
        layer.borderWidth = 1
        layer.borderColor =
        view.backgroundColor = .cyan
        translatesAutoresizingMaskIntoConstraints = false
        let label = UILabel()
        label.text = "AUTO"
        label.translatesAutoresizingMaskIntoConstraints = false
        label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 5).isActive = true
        label.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -5).isActive = true
        label.topAnchor.constraint(equalTo: topAnchor, constant: 5).isActive = true
        view.translatesAutoresizingMaskIntoConstraints = false
        view.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 5).isActive = true
        view.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -5).isActive = true
        view.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 5).isActive = true
        view.widthAnchor.constraint(equalToConstant: 50).isActive = true
        heightConstraint.isActive = true
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")

Creating a BeagleView

A BeagleView can be created with like an UIView. Check out below an example of a ViewController with a container that has a text and a button:

class CustomViewController: UIViewController {
    private lazy var beagleView = BeagleView(
            widgetProperties: WidgetProperties(
                id: "container", 
                style: Style().backgroundColor("#D3D3D3")
                    .margin(EdgeValue(all: 5))
                    .padding(EdgeValue(all: 5))
        ) {
                text: "ADD", 
                onPress: [AddChildren(componentId: "container", value: [AutoLayoutComponent()])]
    override func viewDidLoad() {
        navigationItem.title = "BeagleView"
    private func setupView() {
        view.backgroundColor = .white
        let margin = view.layoutMarginsGuide
        beagleView.translatesAutoresizingMaskIntoConstraints = false
        beagleView.topAnchor.constraint(equalTo: margin.topAnchor).isActive = true
        beagleView.leadingAnchor.constraint(equalTo: margin.leadingAnchor).isActive = true
        beagleView.trailingAnchor.constraint(lessThanOrEqualTo: margin.trailingAnchor).isActive = true
        beagleView.bottomAnchor.constraint(lessThanOrEqualTo: margin.bottomAnchor).isActive = true

Notice that the onPress of the button calls the AddChildren method that adds the native layout, which means that every time the button is pressed, it adds a view with native layout.

Last modified February 11, 2021: create content (#298) (43225e15)