我在单独的ViewController类中实现了两个UITableview。成功为第二个UItableView添加代码后，我的项目构建但在加载后停止。
它以红线停止：
tableView.delegate.dataSource = self
错误如下：
线程 1 EXEC_BAD_INSTRUCTION(代码EXC_i386_INVOP，子代码=0x0(
和
致命错误：解开可选值时意外发现 nil
由于直到在第二个视图控制器中添加第二个 UItableview 之前这才发生，我想知道我的代码是否相互冲突。我将发布两个视图控制器的副本。我应该更改什么？
顺便说一句：FilmsViewController是应用程序崩溃的地方。虽然它在添加MCViewController Films之前就已经工作了：
乙：
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.
}
}
司仪：
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.
}
*/
}
你在哪里初始化tableView？似乎可能nil....
tableView = UITableView(frame: frame)
如果您使用的是 storyboard/xib，您还可以将tableView挂接为 IBOutlet。