How to pass a local function to another object during init?

Question

How to pass a local function to another object during init?

I did the below, but got \'self\' captured by a closure before all members were initialized

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Answer 1

if it's an option for you I'd suggest making the dismiss block not part of the init but rather an optional var on the ContentView.

My solution would look kind of like:

ContentView

class ContentView: UIView {
    var dismiss: (() -> Void)?
    
    init(drawView: UIView) {
        super.init(frame: .zero)
    }
    
    ...
}

You could also indicate the dismiss block will always be there by replacing the ? with an ! (var dismiss: (() -> Void)!) so you don't have to unwrap it when calling but I wouldn't suggest that as it's not compile time safe and so not what you really want.

ContextViewController

class ContextViewController: UIHostingController {

    let drawViewWrapper: ContentView
    
    lazy var selfDismiss: () -> Void = { [unowned self] in
        self.dismiss(animated: true)
    }
    
    init(drawView: CustomDrawView) {
        self.drawViewWrapper = ContentView(drawView: drawView)
        super.init(rootView: self.drawViewWrapper)
        self.drawViewWrapper.dismiss = selfDismiss
    }
    
    ...
}