Support defining custom ViewModifiers

[chkn]

ViewModifier is another protocol in SwiftUI that is implemented as a struct, very similar to View.

• Following the pattern of the View class, create a ViewModifier base class.
• Following the pattern of CustomViewType, make a CustomViewModifierType type that derives from ManagedSwiftType

[CartBlanche]

I have some of this in a branch.

[CartBlanche]

@chkn do you think it's worth updating/rebasing https://github.com/chkn/Xamarin.SwiftUI/tree/dominique-ViewModifier2 to see how much more work is required to finish this? Or scrap the branch and start from scratch??

[chkn]

Good question. You could try merging main into it and see how bad the conflicts are. It looks like most of that work is still applicable, with a little updating. But starting from scratch and copying stuff over might be less tedious