is it ok to call closures in uikit uiviewcontroller from hosted swiftui view?

We cannot use [weak myCar] as myCar is a value type.

In the example from the article, myCar is a struct.

However, in your code:

contentView.buttonTapped = { [weak self] in

self is a UIViewController which is a class (and a reference type).

Your use of [weak self] is perfectly fine: the closure will keep a weak reference to the UIViewController and when you tap a button, the tappedButton() function will be called. Which is probably what you expect.

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