然后,您可以使用以下网址从应用程序访问同一个文件夹：

let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.yourCompanyID.sharedDefaults")!

所以如果你想从两个不同的应用程序共享一个切换状态,你应该如下：

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var sharedSwitch: UISwitch!
    let switchURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.yourCompanyID.sharedDefaults")!
        .appendingPathComponent("switchState.plist")
    override func viewDidLoad() {
        super.viewDidLoad()
        print(switchURL.path)
        NotificationCenter.default.addObserver(self,selector: #selector(updateSwitch),name: .UIApplicationDidBecomeActive,object: nil)
    }
    func updateSwitch(_ notofication: Notification) {
        sharedSwitch.isOn = NSKeyedUnarchiver.unarchiveObject(withFile: switchURL.path) as? Bool ?? false
    }
    @IBAction func switched(_ switch: UISwitch) {
        let success = NSKeyedArchiver.archiveRootObject(switch.isOn,toFile: switchURL.path)
        print(success)
    }
}