Swift - Widget not able to access app group

Question

I have lately been trying to make a widget and wanted to share a piece of data between my widget and my app.

    static var sharedDataFileURL: URL {
        let appGroupIdentifier = "group.com.unknownstudios.yk"
        guard let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroupIdentifier)
            else { preconditionFailure("Expected a valid app group container") }
        return url.appendingPathComponent("userID.plist")
    }

The above code works fine on my app, but when I run it on my widget it gives me the following output. I have checked that the app group is correct and is active on both the iOS app and the widget.

[unspecified] container_create_or_lookup_path_for_platform: client is not entitled
[unspecified] container_create_or_lookup_app_group_path_by_app_group_identifier: client is not entitled
Fatal error: Expected a valid app group container: file WidgetExtension/Library.swift, line 143

Edit:

I have also tried to use UserDefaults, but they don't work either.

The following is the way I use the the FileManager and UserDefaults

UserDefaults(suiteName: "group.com.unknownstudios.yk")!.set("**USERID**", forKey: "userID")

let data = Data("**USERID**".utf8)
do {
    try data.write(to: URL.sharedDataFileURL, options: .atomic)
} catch {
    print(error.localizedDescription)
}

And the following is how I try to read the data from the widget:

    var userID: String? = {
        if let userid = UserDefaults(suiteName: "group.com.unknownstudios.yk")!.string(forKey: "userID") {
            print(userid)
            return userid
        } else if let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.unknownstudios.yk") {
            if let data = try? Data(contentsOf: url.appendingPathComponent("userID.plist")), let string = String(data: data, encoding: .utf8) {
                return string
            }
        }
        return nil
    }()

WidgetExtension app groups:

Main app, app groups:

Markus Moltke · Accepted Answer · 2020-10-12 12:22:17Z

23

I found out what my problem was. I had accidentally selected the release tab under Signing & Capabilities. Which caused my app group to be wrong when checking on release, thus making the error occur. I just had to select All and re-add the app groups capability which made it work again.

answered Oct 12, 2020 at 12:22

Markus Moltke

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2 Comments

qdwang Over a year ago

You saved my day. May be it's a bug in xcode to get Release selected somehow.

Codetard Mar 5 at 6:44

It's probably a bug, i clicked on 'All' and it still created group only for release, i had to make one for 'Debug' separately!

citelao · Accepted Answer · 2024-01-05 06:49:09Z

You may also want to double-check for typos. $(TeamIdentifierPrefix) includes the trailing ..

I had:

// My bundle includes an entry for $(TeamIdentifierPrefix)
// See https://stackoverflow.com/a/28714850/788168
let teamIdentifierPrefix = Bundle.main.object(forInfoDictionaryKey: "TeamIdentifierPrefix") as! String
location = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.\(teamIdentifierPrefix).com.myteam.myapp")!
            .appendingPathComponent("db.sqlite")
            .path

It needed to be:

// My bundle includes an entry for $(TeamIdentifierPrefix)
// See https://stackoverflow.com/a/28714850/788168
let teamIdentifierPrefix = Bundle.main.object(forInfoDictionaryKey: "TeamIdentifierPrefix") as! String
location = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.\(teamIdentifierPrefix)com.myteam.myapp")!
            .appendingPathComponent("db.sqlite")
            .path

As in:

Wrong: "group.\(teamIdentifierPrefix).com.myteam.myapp"
Right: "group.\(teamIdentifierPrefix)com.myteam.myapp"

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