Question 253807 in IOS Swift Question posted in
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Ios swift – Xcode 15 – Preview macro error with UIView

In my legacy code base with public Xcode 15.0, I can’t preview any UIKit views with the new #Preview macro

import SwiftUI

#Preview {
    let uiView = UIView()

    return uiView
}

The canvas fails to load preview with failure diagnostic
Compiling failed: return expression of type 'UIView' does not conform to 'View'

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2

Answers


  1. 0

    I can’t build too..

    the same error: Compiling failed: return expression of type ‘UIButton’ does not conform to ‘View’

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  2. 0

    I find that restricting this one-statement preview to iOS 17 works:

    @available(iOS 17, *)
#Preview {
    return UIView()
}

    However, this two-statement preview still does not work:

    @available(iOS 17, *)
#Preview {
    let uiView = UIView()
    return uiView // 🛑 Value of optional type 'UIView?' must be unwrapped to a value of type 'UIView'
}

    To get the two-statement preview to work, I have to make the variable type explicit:

    @available(iOS 17, *)
#Preview {
    let uiView: UIView = UIView()
    return uiView
}
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