swift - 与协议(protocol) 'UISearchBarDelegate' 的冗余一致性 - Swift 4

Question

我有这个错误

Redundant conformance of 'TodoListViewController' to protocol 'UISearchBarDelegate'

第 1 行的“UISearchBarDelegate”上弹出错误。

extension TodoListViewController: UISearchBarDelegate {

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {

    let request : NSFetchRequest<Item> = Item.fetchRequest()

    let predicate = NSPredicate(format: "title CONTAINS[cd] %@", searchBar.text!)

    request.predicate = predicate

    let sortDescriptor = NSSortDescriptor(key: "title", ascending: true)

    request.sortDescriptors = [sortDescriptor]

    do {
        itemArray = try context.fetch(request)
    } catch {
        print("Error fetching data from context \(error)")
    }

    tableView.reloadData()

  }
}

TodoListViewController 的类声明:

class TodoListViewController: UITableViewController, UISearchBarDelegate {

我已经对此进行了研究，并且没有其他问题对我的错误有效。

Answer 1

您在扩展名 extension TodoListViewController: UISearchBarDelegate {

处添加委托(delegate)

在声明时类 TodoListViewController:UITableViewController，UISearchBarDelegate {

将其从声明中删除

class TodoListViewController: UITableViewController {

}