Custom UIActivity in Swift 3

CustomActivity.swift

import UIKit

class CustomActivity: UIActivity {

    override class var activityCategory: UIActivityCategory {
        return .action
    }
    
    override var activityType: UIActivityType? {
        guard let bundleId = Bundle.main.bundleIdentifier else {return nil}
        return UIActivityType(rawValue: bundleId + "\(self.classForCoder)")
    }
    
    override var activityTitle: String? {
        return <# Title #>
    }

    override var activityImage: UIImage? {
        return <# UIImage #>
    }

    override func canPerform(withActivityItems activityItems: [Any]) -> Bool {
        return true
    }
    
    override func prepare(withActivityItems activityItems: [Any]) {
        //
    }

    override func perform() {
        activityDidFinish(true)
    }
}