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Demo project with tutorial how to customize alerts or popovers in SwiftUI based on this article.

Before starting highly recommended to read SwiftUI Custom Environment Values.

To use PopoverPresenter with a project targeting iOS 13, simply copy folder Source into your project.

To integrate PopoverPresenter into your project using SwiftPM add the following to your Package.swift:

dependencies: [
    .package(url: "https://github.com/c-villain/PopoverPresenter", from: "0.1.0"),
],

1. Import library to your root-file view:

import PopoverPresenter

2. Init instance in root view:

@StateObject var popoverPresenter = PopoverPresenter()

3. Add modifier to root-object view:

.environment(\.popoverPresenterKey, popoverPresenter)
.customPopover(item: $popoverPresenter.activePopover) { popover in
    switch popover {
    default:
        popoverPresenter.currentPopover
    }
}

4. In child view create link to environment key:

@Environment(\.popoverPresenterKey) var popoverPresenter

5. In child view create view with alert:

popoverPresenter.currentPopover = AnyView(Text("This is alert!"))
popoverPresenter.activePopover = .any

You may look iOS example in package for guide steps above.