我在尝试从API下载数据时出现错误并将其显示在TableViewController中。表视图为空。我不明白它是错的。基本上，我遇到了这种错误：
2017-11-25 08:03:42.775803 ClassDesign [2243：51810] [] __nwlog_err_simulate_crash_libsystem libsystem模拟崩溃不可用“libsystem_network.dylib：nw_host_stats_add_src :: SRC_ADDED收到错误：[22]无效参数” 2017-11-25 08：03：42.776596 ClassDesign [2243：51810] [] nw_host_stats_add_src收到SRC_ADDED错误：[22]无效参数，转储回溯： [x86_64] libnetcore-856.30.16 0 libsystem_network.dylib 0x0000000109060666 __nw_create_backtrace_string + 123 1 libsystem_network.dylib 0x00000001090772f6 nw_get_host_stats + 1083 2 libnetwork.dylib 0x0000000109356e9f nw_endpoint_resolver_start_next_child + 1382 3 libdispatch.dylib 0x0000000108ddd978 _dispatch_call_block_and_release + 12 4 libdispatch.dylib 0x0000000108e070cd _dispatch_client_callout + 8 5 libdispatch.dylib 0x0000000108de4e17 _dispatch_queue_serial_drain + 236 6 libdispatch.dylib 0x0000000108de5b4b _dispatch_queue_invoke + 1073 7 libdispatch.dylib 0x0000000108de8385 _dispatch_root_queue_drain + 720 8 libdispatch.dylib 0x0000000108de8059 _dispatch_worker_thread3 + 123 9 libsystem_pthread.dylib 0x00000001091ba1ca _pthread_wqthread + 1387 10 libsystem_pthread.dylib 0x00000001091b9c4d start_wqthread + 13 来自调试器的消息：由于信号15
而终止
我的TableViewController代码是：
import UIKit
class ExerciseTableViewController: UITableViewController {
var fetchedExercise = [Exercise]()
override func viewDidLoad() {
super.viewDidLoad()
parseData()
}
func parseData() {
fetchedExercise = []
let url = "https://wger.de/api/v2/exercise/?format=json&language=2&status=2"
var request = URLRequest(url: URL(string: url)!)
request.httpMethod = "GET"
let configuration = URLSessionConfiguration.default
let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: OperationQueue.main)
let task = session.dataTask(with: request) { (data, response, error) in
if error != nil {
print("Error while parsing JSON")
}
else {
do {
if let data = data,
let fetchedData = try JSONSerialization.jsonObject(with: data, options: .mutableLeaves) as? [String:Any],
let exercises = fetchedData["results"] as? [[String: Any]] {
for eachExercise in exercises
{
let name = eachExercise["name"] as! String
let description = eachExercise["description"] as! String
self.fetchedExercise.append(Exercise(name: name, description: description))
}
// print(self.fetchedExercise[3].name)
}
}
catch {
print("Error while parsing data.")
}
}
}
task.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return fetchedExercise.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "ExerciseCell", for: indexPath) as? ExerciseCell {
let exercise = fetchedExercise[indexPath.row]
cell.configureCell(exercise: exercise)
return cell
} else {
return UITableViewCell()
}
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
}
}
我的自定义单元格类中的'configureCell'函数的代码如下：
import UIKit
class ExerciseCell: UITableViewCell {
@IBOutlet weak var nameLbl: UILabel!
var exercise: Exercise!
func configureCell(exercise: Exercise) {
self.exercise = exercise
nameLbl.text = self.exercise.name
}
}