To convert between source and destination in a binding scenario there is a need for binding converters.
I used binding converters a lot in Cocoa applications, but now a couple of months within the beta-test program of SwiftUI, I have not figured out yet where they hide in the framework and how to set them up.
I hope that some can see, what I am seeing wrong or guide me to a solution to the problem.
Hi,
You need to use Operator, look at the doc here : https://developer.apple.com/documentation/combine/receiving_and_handling_events_with_combine
The sections :
Change the Output Type with Operators
and
Customize Publishers with Operators
And the WWDC talk : https://developer.apple.com/videos/play/wwdc2019/721
If you need more, I will take the time to build a simple example.
Regards
Gérard
Thanks for the answer.
I may have realized that my need for converters is not as high as first thought.
I used them a lot in Cocoa applications, but only seldom, I used two-way bindings and two-way converters.
In the concrete case, I was intending to (two-way) bind a Core Data property having a binary data type (NSAttributedString) to a SwiftUI text field. But this was not possible. Instead I will embed a UITextView into SwiftUI and add computed properties to my Core Data object that converts binary data to NSAttributed strings and vice versa.
Furthermore I now think that SwiftUI, because it is so fast and easy to construct new views, will make the need for converters less than previous.
