Background

• Originally we had the idea to do an extension to provide a kind of automatic functionality but unfortunately that isn't possible for reasons shared bellow. Alternatively I created a subclass of SceneDelegate that customers could use as a subclass to their SceneDelegate and call super on the important methods. I'm not sure this is very useful though. To me it seems easier to just call the manual methods but I wan't to put this PR up to prompt the discussion.

The Problem with Protocol Extensions

// This WON'T work as expected
extension UIWindowSceneDelegate {
func scene(_ scene: UIScene, openURLContexts URLContexts: Set) {
for context in URLContexts {
MParticle.sharedInstance().handleURLContext(context)
}
}
}
Why it fails:

UIKit uses Objective-C runtime to check if the delegate responds to selectors

Protocol extension methods aren't added to the class's method table - they exist only at the Swift protocol level

When UIKit calls scene(_:openURLContexts:), it does [delegate respondsToSelector:@selector(scene:openURLContexts:)] which returns NO for protocol extension methods

What Has Changed

• Implement MPSceneDelegate which implements the UIWindowSceneDelegate protocol with what we'd recommend customers call. They can use this as the subclass of their SceneDelegate and have automatic implementations assuming they don't have any SceneDelegate implementation of their own.

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://rokt.atlassian.net/browse/SDKE-644