Working with TipKit when still supporting iOS 16 and below

TipShim.swift

import TipKit


/// Small helper protocol for a tip that is available below iOS 17
/// so that we can pass tips around and have members storing tips
/// (as stored properties can't be marked with `@available`).
@available(iOS, obsoleted: 17, message: "Can be removed once we only support iOS 17+")
public protocol TipShim {

    @available(iOS 17, *)
    var tip: AnyTip { get }

}

@available(iOS 17, *)
public extension Tip where Self: TipShim {

    var tip: AnyTip { AnyTip(self) }

}

public extension View {

    /// Helper for making the `popupTip` modifier available for iOS <17.
    @available(iOS, obsoleted: 17, message: "Can be removed once we only support iOS 17+")
    @ViewBuilder func popupTipShim(_ tipShim: TipShim?, arrowEdge: Edge = .top) -> some View {
        if #available(iOS 17, *), let tip = tipShim?.tip {
            self.popoverTip(tip, arrowEdge: arrowEdge)
        } else {
            self
        }
    }

}

You only need to have your tips conform to TipShim, and you can freely store them in a member or pass them to a method as a TipShim:

struct MyTip: Tip, TipShim {
    // ...
}

struct MyView {

    let tip: TipShim?

    var body: some View {
        Button(...)
            .popupTipShim(self.tip)
    }

}

struct OtherView {

    let tipOnButton: TipShim? = if #available(iOS 17, *) { MyTip() } else { nil }

    var body: some View {
        MyView(tip: self.tipOnButton)
    }

}