Use Target Action with a Coordinator
To see another way to add a PHPicker to your SwiftUI app, check out this video about Combine & SwiftUI: WWDC 2020: Combine & SwiftUI
For more SwiftUI, including a chapter on integration with UIKit, read SwiftUI by Tutorials
The coordinator can help you out with more than delegates! You can also use it to implement target action for UIKit controls in SwiftUI.