Forced focus targetting

tryToSendFocus.swift

    // Focus management
    private var targetFocusEnv: UIFocusEnvironment?
    
    override var preferredFocusEnvironments: [UIFocusEnvironment] {
        if let target = targetFocusEnv {
            return [target]
        } else {
            return []
        }
    }
    
    override func didUpdateFocus(in context: UIFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
        // clear focus target
        targetFocusEnv = nil
    }
    
    func tryToSendFocus(to environment: UIFocusEnvironment) {
        runOnMain {
            self.targetFocusEnv = environment
            self.setNeedsFocusUpdate()
            self.updateFocusIfNeeded()
        }
    }