Recreate iOS 13' share sheet modal in swift (not the share sheet itself, but the way it's presented)

Question

is there a way to easily recreate the modal presentation style of ios 13' new share sheet? (At first, it's only presented halfway and you can swipe up to make it a "full" modal sheet) I can do it using a completely custom presentation and stuff but is there a "native" api for this behavior so that you don't have to use custom code?

Thanks!

Answer 1

Here's what I've tried. I've created a new ViewController class extending UIActivityViewController. And in the viewDidLoad function, I removed all the child views from the controller and added my viewController as a child to it. It seems to be working fine. Although, it is more of a work around it is still sufficient enough for the requirement it seems. Code snippet is as follows. Give it a try.

import UIKit

class CustomActivityViewController: UIActivityViewController {

    private let controller: UIViewController!

    required init(controller: UIViewController) {
        self.controller = controller
        super.init(activityItems: [], applicationActivities: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        let subViews = self.view.subviews
        for view in subViews {
            view.removeFromSuperview()
        }

        self.addChild(controller)
        self.view.addSubview(controller.view)
    }

}

Above is the CustomActivityViewController. And you can add your viewController into it as follows.

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "YourViewController")
let activityViewController = CustomActivityViewController(controller: controller)
self.present(activityViewController, animated: true, completion: nil)

Answer 2

If you are interested in private API, this is how Apple does it:

There is a class named _UISheetDetent. With this class, you can either create system defined "detents"—medium and large—or provide your own block-based logic (input param is the presentation controller's container view, and the return value is a double—the percent to open the sheet).

You create an array of these "detents" and provide them to the sheet presentation controller using the _setDetents: method (or setValue:forKey:). To replicate the share sheet behavior, you need an array with two "detents": medium and large.

There is also the _indexOfLastUndimmedDetent property, which controls which "detent" starts the dimming process.

I'm not sure why Apple hasn't exposed this as public API. It is concise, simple and works well.

You should probably not use this API, but if you decide to use it, it should be very easy to hide it. In any case, make sure to open a Feedback with Apple to expose this API in a future version of the SDK.