Google 放置 API 请求 returns 空数组但打印所有响应 - 没有错误

Question

我有以下无错代码，但似乎无法使用任何用于我的结果数组的信息。尝试后，我可以打印列出的每个 businessID 位置，但我不能 add/use 用于保存此信息的数组。我不明白为什么每个位置都打印但我的数组显示为空。

我为我的全部代码道歉，但我花了几个小时试图纠正我的问题...

import UIKit
import GooglePlaces

class FoodTwo: UITableViewController {

var placesClient: GMSPlacesClient!

let international: [String] = ["ChIJAQDABX7CIogRIEY3k6r7R-g",
"ChIJqX3q1IbCIogRFcuI05IPNDU",
"ChIJAQDABX7CIogRY2MA6XVas8E"]

let american: [String] = ["ChIJkX9tTSvoIogROXkxd0gpg3s", "ChIJy7lUZCfoIogRVBuB9jWKHUk", "ChIJyzCZMiroIogRkuMavnKsA0w", "ChIJbYvWJ5jCIogRxh0VQA_yD0I", "ChIJa4Sks23CIogRpRod4v5GEN8", "ChIJxVpGsNbpIogRG5HIAKbNyDU", "ChIJ1W32UyvoIogRyp_Rdxn6f8I", "ChIJwTht4ifoIogRsuXdEOrKGMk", "ChIJ6UXEgNPpIogR4Q3ZAAWQQSI", "ChIJUZVAjdTpIogRpyca26a6D8o",                 "ChIJ6-h6_EctIIgRO1kypozaGGs", "ChIJK8NGam7CIogRlzU1TKeSjVI", "ChIJ7Xxh1m3CIogRZ_yabslUzd8", "ChIJ_dxSGJ7CIogRcYwJhjAm7TQ"]

 // more arrays here - deleted to reduce scrolling//

var results = [GMSPlace]()

var index: IndexPath!

override func viewDidLoad() {
    super.viewDidLoad()

placesClient = GMSPlacesClient.shared()
     var place: [String]

    switch index.row
    {
    case 0 :
        place = international
    case 1 :
        place = american
    case 2 :
        place = asian
    case 3 :
        place = bakery
    case 4 :
         place = bar
     case 5 :
      place = indian
     case 6 :
        place = italian
     default :
         place = mexican
    }
    for id in place
    {
        placesClient.lookUpPlaceID(id, callback: { (result, error) -> Void in

            if let error = error {
                print("lookup place id query error: \(error.localizedDescription)")
                return
            }

           guard let result = result
          else
           {
            print("No place details for \(id)")
            return
            }
        self.results.append(result)

        })
        OperationQueue.main.addOperation( { () -> Void in
            self.tableView.reloadData()
               })

        }
 }

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return results.count
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "FCT") as! FoodCellTwo

    let each = results[indexPath.row]
    cell.nameLabel.text = each.name

    return cell
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

}
}

Answer 1

placesClient.lookUpPlaceID 是一个 异步函数 。你必须等到它完成。因此，您实际上是在 table 数组填充之前 重新加载 table 视图。

您应该在数组填充后 重新加载 table 视图。

for id in place { placesClient.lookUpPlaceID(id) { result, error in if let error = error { print("lookup place id query error: \(error.localizedDescription)") return } guard let result = result else { print("No place details for \(id)") return } self.results.append(result) if place.count == self.results.count { self.tableView.reloadData() } } }

Google 放置 API 请求 returns 空数组但打印所有响应 - 没有错误

Google Places API request returns empty array but prints all responses - no error

arrays

swift3

google-places-api