How would I return a View conforming to a protocol from SwiftUI View body?

Question

I've tried this

protocol ErrorableViewProtocol: View {
    var error: Error? { get set }
}

struct ErrorableView: View {
    var normal: any ErrorableViewProtocol
    var error: Error
    
    var body: some View {
        if let error = normal.error {
            ErrorView(error: error)
        } else {
            normal
        }
    }
}

but my knowledge of swift is lacking resulting in:

Please advice what's a good way to show an ErrorView in place or navigate to that once a network error has happened. Thanks.

burnsi · Accepted Answer · 2022-10-24 10:41:19Z

3

You would need to make your View generic:

struct ErrorableView<T: ErrorableViewProtocol>: View {
    var normal: T
    var error: Error
    
    var body: some View {
        if let error = normal.error {
            ErrorView(error: error)
        } else {
            normal
        }
    }
}

answered Oct 24, 2022 at 10:41

burnsi

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3 Comments

Anton Tropashko Over a year ago

How would I make ErrorableView track changes to normal.error and rebuild? currently it does not

burnsi Over a year ago

@AntonTropashko Take a look at PreferenceKey. But I would think this is out of the scope of this question TBH. Better ask a new one.

Anton Tropashko Over a year ago

Thanks. Looking. The separate question is here stackoverflow.com/questions/74181700/…

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