How to implement full layout composition in iOS?

In iOS, to implement a full layout, Auto Layout with NSLayoutConstraint or the more modern SwiftUI are usually used.

If we talk about UIKit, then you can:

• Use a UIView as a container that occupies the entire screen.
• Add child elements with constraints that attach them to the edges of the superview (leading, trailing, top, bottom).
• Use safeAreaLayoutGuide to account for notches and bars.

Example in UIKit with Auto Layout:

let containerView = UIView()
containerView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(containerView)

NSLayoutConstraint.activate([
    containerView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
    containerView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
    containerView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
    containerView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor)
])

In SwiftUI, simply use ZStack or VStack with the .edgesIgnoringSafeArea(.all) modifier for full screen coverage.

Thus, a full layout is a layout that occupies the entire available screen area, taking safe zones into account.