UIKit Skill

Comprehensive UIKit framework knowledge for building traditional iOS user interfaces.

Prerequisites

• Xcode 15+ installed
• iOS 15+ deployment target recommended
• Understanding of MVC/MVVM patterns

Parameters

parameters:
  layout_approach:
    type: string
    enum: [programmatic, storyboard, xib]
    default: programmatic
  accessibility_enabled:
    type: boolean
    default: true
  dynamic_type_support:
    type: boolean
    default: true

Topics Covered

View Controllers

Auto Layout

Table & Collection Views

Code Examples

Programmatic View Controller

final class ProfileViewController: UIViewController {
    // MARK: - UI Components

    private lazy var avatarImageView: UIImageView = {
        let imageView = UIImageView()
        imageView.contentMode = .scaleAspectFill
        imageView.clipsToBounds = true
        imageView.layer.cornerRadius = 50
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.accessibilityLabel = "Profile picture"
        return imageView
    }()

    private lazy var nameLabel: UILabel = {
        let label = UILabel()
        label.font = .preferredFont(forTextStyle: .title1)
        label.adjustsFontForContentSizeCategory = true
        label.textAlignment = .center
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()

    private lazy var bioLabel: UILabel = {
        let label = UILabel()
        label.font = .preferredFont(forTextStyle: .body)
        label.adjustsFontForContentSizeCategory = true
        label.numberOfLines = 0
        label.textAlignment = .center
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()

    // MARK: - Lifecycle

    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
        setupConstraints()
    }

    // MARK: - Setup

    private func setupUI() {
        view.backgroundColor = .systemBackground
        view.addSubview(avatarImageView)
        view.addSubview(nameLabel)
        view.addSubview(bioLabel)
    }

    private func setupConstraints() {
        NSLayoutConstraint.activate([
            avatarImageView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 32),
            avatarImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            avatarImageView.widthAnchor.constraint(equalToConstant: 100),
            avatarImageView.heightAnchor.constraint(equalToConstant: 100),

            nameLabel.topAnchor.constraint(equalTo: avatarImageView.bottomAnchor, constant: 16),
            nameLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            nameLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),

            bioLabel.topAnchor.constraint(equalTo: nameLabel.bottomAnchor, constant: 8),
            bioLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            bioLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20)
        ])
    }

    // MARK: - Configuration

    func configure(with user: User) {
        nameLabel.text = user.name
        bioLabel.text = user.bio
        // Load avatar image
    }
}

Modern Collection View with Diffable Data Source

final class ProductGridViewController: UIViewController {
    enum Section { case main }

    private var collectionView: UICollectionView!
    private var dataSource: UICollectionViewDiffableDataSource<Section, Product>!

    override func viewDidLoad() {
        super.viewDidLoad()
        configureCollectionView()
        configureDataSource()
    }

    private func configureCollectionView() {
        let layout = createCompositionalLayout()
        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
        collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        collectionView.backgroundColor = .systemBackground
        view.addSubview(collectionView)
    }

    private func createCompositionalLayout() -> UICollectio

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