关于 ios:RxSwift: 当一个类有 disposeBag 属性时总是使用 [unowned self] 是否安全？

    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var tableView: UITableView!

    private let disposeBag = DisposeBag()
    private var results = Variable<[Item]>([])
    private var searchText = Variable("")
    var selectedCompletion: ((Item) -> Void)!

    override func viewDidLoad() {
        super.viewDidLoad()
        results.asObservable()
            .bind(to: tableView.rx.items(cellIdentifier:"CustomCell", cellType: CustomCell.self)) { row, item, cell in
                cell.configure(with: item)
            }
            .disposed(by: disposeBag)

        tableView.rx.itemSelected
            .subscribe(onNext: { ip in
                self.selectedCompletion(self.results.value[ip.row])
                self.navigationController?.popViewController(animated: true)
            })
            .disposed(by:disposeBag)

        searchBar.rx.text
            .debounce(0.6, scheduler: MainScheduler.instance)
            .subscribe(onNext: { searchText in
                if searchText == nil || searchText!.isEmpty { return }
                self.search(query: searchText!)
            })
            .disposed(by: disposeBag)
    }

    private func search(query: String) {
        // Search asynchronously
        search(for: query) { response in

            // Some logic here…
            self.results.value = searchResult.results
        }
    }
}