尝试使用JSON数据填充tableview。获取tableview = UITableView? nil none。
尝试使用JSON数据填充tableview。获取tableview = UITableView? nil none。
我在以下代码行处遇到了一个错误：
Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
这是在 DispatchQueue.main.async{ self.tableView.reloadData() } 这行代码上。
我的代码如下：
import UIKit
class BrowseRequestsViewController: UIViewController, UITableViewDelegate,UITableViewDataSource {
final let url = URL(string: "")
private var browseRequestDataModel = [Datum]()
@IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
downloadJson()
}
func downloadJson() {
guard let downloadURL = url else { return }
URLSession.shared.dataTask(with: downloadURL) { data, urlResponse, error in
guard let data = data, error == nil, urlResponse != nil else {
print("something is wrong")
return
}
print("downloaded")
do {
let decoder = JSONDecoder()
let downloadedBrowseRequestData = try decoder.decode(BrowseRequestsDataModel.self, from: data)
self.browseRequestDataModel = downloadedBrowseRequestData.data
DispatchQueue.main.async {
self.tableView.reloadData()
}
} catch {
print("something wrong after downloaded")
}
}.resume()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return browseRequestDataModel.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "BrowseRequestsTableViewCell" ) as? BrowseRequestsTableViewCell else { return UITableViewCell() }
cell.shipperName.text = browseRequestDataModel[indexPath.row].user.name
cell.pickupLocation.text = browseRequestDataModel[indexPath.row].pickupLocation.pickupLocationCity + " , " + browseRequestDataModel[indexPath.row].pickupLocation.pickupLocationCountry
cell.dropoffLocation.text = browseRequestDataModel[indexPath.row].dropoffLocation.dropoffLocationCity + " , " + browseRequestDataModel[indexPath.row].dropoffLocation.dropoffLocationCountry
cell.item.text = browseRequestDataModel[indexPath.row].item.name
cell.pickupDate.text = browseRequestDataModel[indexPath.row].pickupDate
cell.dropoffDate.text = browseRequestDataModel[indexPath.row].dropoffDate
return cell
}
}