Question

我无法更新retRecalls数组。它在循环中更新但主要是空的，我无法找出原因。如果我在viewDidLoad中打印为空，如果我在循环中打印就可以了。

var retRecalls = [Recalls]() ***** MAIN ARRAY

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    tableView.dataSource = self
    tableView.delegate = self
    print(retRecalls) ***** EMPTY

}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    Alamofire.request(recallsApi+vehicle).responseJSON { response in
        let result = response
        if let returnDict = result.value as? [String:Any] {
            if let recall = returnDict["recalls"] as? [[String:Any]] {
                for i in recall {
                    let id = i["nnaId"]
                    let header = i["secondaryDescription"]
                    let summary = i["primaryDescription"]
                    let risk = i["riskIfNotRepaired"]
                    let remedy = i["remedyDescription"]
                    let recallsArray = Recalls(recallId: id as! String, header: header as! String, summary: summary as! String, risk: risk as! String , remedy: remedy as! String)
                    self.retRecalls.append(recallsArray)
                    print(retRecalls) **** IT'S UPDATING
                }
            }
        }
    }
    tableView.reloadData()
}
}

谢谢

Answer 1

因此，您需要等待网络调用在填充数组之前返回。

将reloadData()置于网络操作之外意味着它会立即被调用。您希望在网络操作完成后将其推迟到已调用，并且已填充阵列。

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    Alamofire.request(recallsApi+vehicle).responseJSON { response in
        let result = response
        if let returnDict = result.value as? [String:Any] {
            if let recall = returnDict["recalls"] as? [[String:Any]] {
                for i in recall {
                    let id = i["nnaId"]
                    let header = i["secondaryDescription"]
                    let summary = i["primaryDescription"]
                    let risk = i["riskIfNotRepaired"]
                    let remedy = i["remedyDescription"]
                    let recallsArray = Recalls(recallId: id as! String, header: header as! String, summary: summary as! String, risk: risk as! String , remedy: remedy as! String)
                    self.retRecalls.append(recallsArray)
                    print(retRecalls) **** IT'S UPDATING
                }
            }
        }
        // Move the reloadData() call to here.
        dispatchQueue.main.async {
            tableView.reloadData()
        }
    }
    // tableView.reloadData()
}
}

Swift数组没有更新

1 个答案: