UITableView crashes at start at tableview.datasource - ios

Question

I have implemented two UITableview in seperate ViewController classes. After successfully adding the code for the second UItableView my project builds but stops after loading.
It stops with a red line on:
tableView.delegate.dataSource = self
With an error that reads:
Thread 1 EXEC_BAD_INSTRUCTION (code-EXC_i386_INVOP,subcode=0x0)
AND
fatal error: unexpectedly found nil while unwrapping an Optional value
Since this didn't happen until adding the second UItableview in the second view controller I'm wondering if maybe my code is conflicting with each other. I will post copies of both view controllers. What should I change?
By the way: FilmsViewController is where the app is crashing. Although it was working prior to adding MCViewController Films:
B:
class FilmsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
weak var tableView : UITableView!
var FilmArray = [String]()
let film_url = "https://www.testing.com/api/resources/films/1"
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return FilmArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "mycell", for:indexPath) as! FilmsAPITableViewCell
// Configuring Cell
cell.movieTitle.text = FilmArray[indexPath.row]
// Returning the cell
return cell
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
let url:URL = URL(string: film_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "GET"
request.setValue("740c94c51891c02b64d6c78840b478fe0b02fe2c", forHTTPHeaderField: "X-API-KEY")
request.setValue("Basic YmhlZW0uZW5nckBnbWFpbC5jb206YmgzM20=", forHTTPHeaderField: "Authorization")
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
let paramString = ""
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
var json:Any?
do
{
if let existingData = data {
json = try JSONSerialization.jsonObject(with: existingData, options: [])
}
// Prasing JSON
if let parsedData = json as? [[String:Any]] {
for dict in parsedData {
if let title = dict["title"] as? String {
self.FilmArray.append(title)
print(json)
}
}
OperationQueue.main.addOperation({
self.tableView.reloadData()
})
}
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
if let data_block = server_response["data"] as? NSDictionary
{
if let session_data = data_block["session"] as? String
{
// self.login_session = session_data
let preferences = UserDefaults.standard
preferences.set(session_data, forKey: "session")
// DispatchQueue.main.async(execute: self.LoginDone)
}
}
})
task.resume()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
MC:
class MCViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
let message_url = "https://www.testing.com/api/resources/get_film_message/film_id/3825"
let send_url = "https://www.testing.com/api/resources/send_film_message"
let film_id = "3825"
var messageArray = [String]()
weak var tableView : UITableView!
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messageArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "msgContent", for:indexPath) as! MessageTableViewCell
// Configuring Cell
cell.msgContent.text = messageArray[indexPath.row]
// Returning the cell
return cell
}
#IBOutlet weak var MessageInput: UITextField!
#IBAction func Sendmsg(_ sender: Any) {
Sendmsg(username:MessageInput.text!, password: film_id)
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
// Do any additional setup after loading the view.
//let post_data: NSDictionary = NSMutableDictionary()
// post_data.setValue(username, forKey: "username")
// post_data.setValue(password, forKey: "password")
let url:URL = URL(string: message_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "GET"
request.setValue("740c94c51891c02b64d6c78840b478fe0b02fe2c", forHTTPHeaderField: "X-API-KEY")
request.setValue("Basic YmhlZW0uZW5nckBnbWFpbC5jb206YmgzM20=", forHTTPHeaderField: "Authorization")
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
// Do any additional setup after loading the view.
var paramString = ""
// for (key, value) in post_data
// {
// paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
// }
//
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
if let parsedData = json as? [[String:Any]] {
for dict in parsedData {
if let title = dict["message"] as? String {
self.messageArray.append(title)
print(json)
}
}
}
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
if let data_block = server_response["data"] as? NSDictionary
{
if let session_data = data_block["session"] as? String
{
// self.login_session = session_data
let preferences = UserDefaults.standard
preferences.set(session_data, forKey: "session")
// DispatchQueue.main.async(execute: self.LoginDone)
}
}
})
task.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func Sendmsg(username:String, password:String)
{
let post_data: NSDictionary = NSMutableDictionary()
post_data.setValue(username, forKey: "message")
post_data.setValue(password, forKey: "film_id")
let url:URL = URL(string: send_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.setValue("740c94c51891c02b64d6c78840b478fe0b02fe2c", forHTTPHeaderField: "X-API-KEY")
request.setValue("Basic YmhlZW0uZW5nckBnbWFpbC5jb206YmgzM20=", forHTTPHeaderField: "Authorization")
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
var paramString = ""
for (key, value) in post_data
{
paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
}
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
print(json)
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
// if let data_block = server_response["data"] as? NSDictionary
// {
// if let session_data = data_block["session"] as? String
// {
// self.login_session = session_data
//
// let preferences = UserDefaults.standard
// preferences.set(session_data, forKey: "session")
//
// DispatchQueue.main.async(execute: self.LoginDone)
// }
// }
//
})
task.resume()
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}

Answer 1

Where are you initializing tableView? Seems like it might be nil....
tableView = UITableView(frame: frame)
If you're using storyboard/xib, you can also hook tableView up as an IBOutlet.