如何修复重装数据

Question

我正在尝试获取文本并找到匹配的地址并在tableview中显示它们 - 我找到了地址但是tableview dosent reload（我正在调用tableview.reloaddeta（））

import UIKit
import MapKit
import Contacts


class LocationSearchTable : UITableViewController{


    var searchText:String?
    var matchingItems:[MKMapItem] = []
    var mapView: MKMapView? = nil
    var handleMapSelected:HandleMapSearch? = nil

    var locationDelegate : LocationDelegated?


    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.dataSource = self
        tableView.delegate = self

    }
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return matchingItems.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "cell")
        let selectedItem = matchingItems[indexPath.row].placemark

        cell?.textLabel?.text = selectedItem.name ?? "hiiha"

        return cell!
    }

}


extension LocationSearchTable : LocationDelegated{

    func setBar(_ searchText: String?) {

        guard let mapView = mapView, let searchBarText = searchText else {return}

        let request = MKLocalSearch.Request()
        request.naturalLanguageQuery = searchBarText
        request.region = mapView.region
        let search = MKLocalSearch(request: request)
        search.start { (response, err) in
            guard let response = response else{return}
            print(response.mapItems[0].name!)
            self.matchingItems = response.mapItems
            print(self.matchingItems.count , " this is my size")
         *// i see that matchingItems is bigger then 0 but the tableview is allwaze empty*
        }

        tableView.reloadData()
    }



}

我希望tableview重新加载并显示所有地址

Answer 1

你在错误的地方叫reloadData()。

search.start异步工作。将线移动到闭合中。

search.start { (response, err) in
    guard let response = response else { return }
    print(response.mapItems[0].name!)
    self.matchingItems = response.mapItems
    print(self.matchingItems.count , " this is my size")
    self.tableView.reloadData()
}

而这些线路是多余的

tableView.dataSource = self
tableView.delegate = self

override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

UITableViewController默认连接dataSource和delegate，默认也有一个部分。