iPad Popover Share Sheet in Swift UI - ios

Question

I'm trying to show the iPad Popover share sheet (which uses UIPopoverPresentationController) from a SwiftUI Button. I've been able to get it to show but it only shows in the top left origin despite the sourceView and sourceRect being set differently.
Is there something else I need to set?
This is what the code currently produces,
This is the code I have so far,
struct ContentView: View {
#State
var label = "N/A"
#State
var buttonPos = CGRect(x: 0, y: 0,
width: 0, height: 0)
var body: some View {
VStack{
Spacer(minLength: 900)
GeometryReader { geometry in
Button("Share"){
print("Share button is located at \(buttonPos)")
showShareSheetAtPopover()
}.padding()
.frame(width: geometry.size.width)
.frame(height: geometry.size.height)
.background(Color.pink)
.onAppear(perform: {
buttonPos = geometry.frame(in: .global)
let localPos = geometry.frame(in: .local)
label = "Width: \(buttonPos.size) \n Global Pos: \(buttonPos.origin) \n Local Pos: \(localPos.origin)"
})
}.background(Color.orange)
Text(label)
.padding()
.background(Color.mint)
.frame(minHeight: 0, maxHeight: .infinity)
// don't truncate text
.lineLimit(nil)
.fixedSize(horizontal: false, vertical: true)
}.background(Color.yellow)
}
func showShareSheetAtPopover(){
let vc = (UIApplication.shared.windows.first?.rootViewController)!
let shareItem = ["Some Text to Share"]
let ac = UIActivityViewController(
activityItems: shareItem,
applicationActivities: nil)
let onAnIPad = (ac.popoverPresentationController != nil)
print( onAnIPad ? "On an iPad":"Not on an iPad" )
if (onAnIPad){
let popoverPos = buttonPos
let ppc = ac.popoverPresentationController!
let sourceView = UIView(frame: popoverPos)
print("Source View Frame \(sourceView.frame)")
ppc.sourceView = sourceView
ppc.sourceRect = popoverPos
//vc.show(ac, sender: {})
vc.present(ac, animated: true)
print(ppc.frameOfPresentedViewInContainerView)
}else{
vc.show(ac, sender: {})
}
}
}

Answer 1

I got it kind of working by using a UIViewRepresentable to wrap a UIButton in the SwiftUI view and use that as the anchor point.
Here is the updated code, it is not at all pretty or clean.
import Foundation
import SwiftUI
final class MyUIButton: NSObject, UIViewRepresentable{
#objc let action: () -> Void
#objc var button: UIButton
init(action: #escaping () -> Void){
print("Creating button")
self.action = action
self.button = UIButton()
super.init()
self.button.setTitle("My Button", for: UIControl.State.normal)
self.button.configuration = .filled()
self.button.addTarget(self,
action: #selector(self.onButtonClick),
for: UIControl.Event.touchDown)
}
func makeUIView(context: Context) -> some UIView {
print("Making button")
return button
}
#objc func onButtonClick(){
print("onClick")
action()
}
func updateUIView(_ uiView: UIViewType, context: Context) {
print("Updating")
}
}
import SwiftUI
struct ContentView: View {
#State
var label = "N/A"
#State
var buttonPos = CGRect(x: 0, y: 0,
width: 0, height: 0)
// need to set it as a class variable otherwise the
// selector does not get called
// see https://stackoverflow.com/questions/45158000/uibutton-addtarget-selector-is-not-working
var myButton = MyUIButton(action:{
print("Clicked!")
})
var body: some View {
VStack{
Spacer(minLength: 900)
self.myButton
GeometryReader { geometry in
Button("Share"){
print("Share button is located at \(buttonPos)")
showShareSheetAtPopover()
}.padding()
.frame(width: geometry.size.width)
.frame(height: 40)
.background(Color.pink)
.onAppear(perform: {
buttonPos = geometry.frame(in: .global)
let localPos = geometry.frame(in: .local)
label = "Width: \(buttonPos.size) \n Global Pos: \(buttonPos.origin) \n Local Pos: \(localPos.origin)"
})
}.background(Color.orange)
Spacer(minLength: 50)
Text(label)
.padding()
.background(Color.mint)
.frame(minHeight: 0, maxHeight: .infinity)
// don't truncate text
.lineLimit(nil)
.fixedSize(horizontal: false, vertical: true)
}.background(Color.yellow)
}
func showShareSheetAtPopover(){
let vc = (UIApplication.shared.windows.first?.rootViewController)!
let shareItem = ["Some Text to Share"]
let ac = UIActivityViewController(
activityItems: shareItem,
applicationActivities: nil)
let onAnIPad = (ac.popoverPresentationController != nil)
print( onAnIPad ? "On an iPad":"Not on an iPad" )
if (onAnIPad){
let popoverPos = buttonPos
let ppc = ac.popoverPresentationController!
let sourceView = UIView(frame: popoverPos)
print("Source View Frame \(sourceView.frame)")
ppc.sourceView = myButton.button
//ppc.sourceRect = popoverPos
//vc.show(ac, sender: {})
vc.present(ac, animated: true)
print(ppc.frameOfPresentedViewInContainerView)
}else{
vc.show(ac, sender: {})
}
}
}