How do I port an iPad app to macOS with Mac Catalyst?

Porting an iPad app to macOS using Mac Catalyst is a straightforward process that allows developers to adapt their iOS applications to run natively on macOS while retaining most of the existing code and features. Below is a step-by-step guide along with an example of how to get started.

To port your iPad app to macOS with Mac Catalyst, follow these steps:

1. Ensure your project is using the latest version of Xcode.
2. Open your iPad application project in Xcode.
3. Select your project in the project navigator and then select your app target.
4. Enable Mac Catalyst in the "General" tab by checking the "Use Mac Catalyst" option.
5. Configure any required app settings, such as the display settings and keyboard shortcuts to make the app more desktop-friendly.
6. Test your app using the macOS simulator or on an actual macOS device.
7. Make any adjustments based on the user experience on macOS, such as layout changes for different screen sizes or adding support for keyboard and mouse interactions.
8. Finally, build and archive your app for distribution through the Mac App Store.

Here’s a simple code example to illustrate how to implement a button action that works in both iOS and macOS:

        import UIKit

        class MyViewController: UIViewController {
            override func viewDidLoad() {
                super.viewDidLoad()
                
                let button = UIButton(type: .system)
                button.setTitle("Click Me", for: .normal)
                button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
                self.view.addSubview(button)
            }

            @objc func buttonTapped() {
                print("Button was tapped!")
            }
        }