Building SwiftUI Apps: Modern iOS Development

SwiftUI Overview

SwiftUI is Apple's modern UI framework for building declarative user interfaces across all Apple platforms.

Basic SwiftUI View

import SwiftUI

struct ContentView: View {
    @State private var users: [User] = []
    
    var body: some View {
        NavigationView {
            List(users) { user in
                VStack(alignment: .leading) {
                    Text(user.name)
                        .font(.headline)
                    Text(user.email)
                        .font(.subheadline)
                        .foregroundColor(.gray)
                }
            }
            .navigationTitle("Users")
            .onAppear {
                fetchUsers()
            }
        }
    }
    
    func fetchUsers() {
        guard let url = URL(string: "https://api.example.com/users") else { return }
        
        URLSession.shared.dataTask(with: url) { data, _, _ in
            guard let data = data else { return }
            if let decoded = try? JSONDecoder().decode([User].self, from: data) {
                DispatchQueue.main.async {
                    self.users = decoded
                }
            }
        }.resume()
    }
}

Best Practices

• Use @Published for state management
• Use async/await for API calls
• Update UI on main thread
• Handle errors gracefully
• Use MVVM architecture