当我从另一个视图控制器调用时，为啥我的表视图为零？
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【中文标题】当我从另一个视图控制器调用时，为啥我的表视图为零？【英文标题】：iWhy my table view is nil when i called from another view controller?当我从另一个视图控制器调用时，为什么我的表视图为零？ 【发布时间】：2015-04-06 11:15:19 【问题描述】：当用户通过将表视图中的标签设置为“ONLY MEMBER”来注销时，我试图从左侧菜单（滑出）重新加载我的表视图控制器。所以，我调用了 refreshAuctionLatestViewController.viewWillAppear(true)。但是，将在该方法中重新加载的表视图为零。有什么帮助吗？
这是我的幻灯片菜单控制器 (SlideMenu)
import UIKit
class LeftMenuViewController: UIViewController ,UITableViewDataSource, UITableViewDelegate
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var userEmail: UIButton!
@IBOutlet weak var btnLogOut: UIButton!
var refreshActionLatestController:AuctionLatestViewController!
override func viewDidAppear(animated: Bool)
super.viewDidAppear(true)
let isLoggedIn = TegKeychain.get("isLoginIn")
let userEmail = TegKeychain.get("userEmail_keyChain")
if (isLoggedIn != "1")
self.btnLogOut.enabled = false
self.btnLogOut.hidden = true
self.userEmail.enabled = true
else if userEmail != nil
self.userEmail.titleLabel?.text = userEmail
self.userEmail.enabled = false
self.btnLogOut.enabled = true
self.btnLogOut.hidden = false
@IBAction func logoutTapped(sender : UIButton)
refreshActionLatestController = AuctionLatestViewController()
self.slideMenuController()?.closeLeft() //Closing the Slide and show user with alert on main view controller
let logOutAlertController = UIAlertController(title : "Log Out",message: "Are You Sure You Gonna Log Out?",preferredStyle : .ActionSheet)
let callAction = UIAlertAction(title: "Log Out", style: .Default, handler:
action in
var token:NSString = TegKeychain.get("userToken_keyChain")!
var email:NSString = TegKeychain.get("userEmail_keyChain")!
var params : Dictionary <String,String> = ["appid" : token, "email" : email]
var params2 = self.createStringFromDictionary(params)
var paramsLength = "\(countElements(params2))"
var err: NSError?
NSLog("PostData: %@",params2);
var url:NSURL = NSURL(string:"http://localhost:8080/xx/xxx/account/logout")!
var requestBodyData = (params2 as NSString).dataUsingEncoding(NSUTF8StringEncoding)
var request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = requestBodyData
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var reponseError: NSError?
var response: NSURLResponse?
var urlData: NSData? = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&reponseError)
if ( urlData != nil )
let res = response as NSHTTPURLResponse!;
NSLog("Response code: %ld", res.statusCode);
if (res.statusCode >= 200 && res.statusCode < 300)
var responseData:NSString = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!
NSLog("Response ==> %@", responseData);
var err: NSError?
let jsonData:NSDictionary = NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers , error: &err) as NSDictionary
let status:NSString = jsonData.valueForKey("status") as NSString
//let error:NSString = jsonData.valueForKey("error") as NSString
NSLog("Status:", status);
NSLog("Error:", status);
if(status == "ok")
NSLog("Log Out SUCCESS");
TegKeychain.delete("userEmail_keyChain")
TegKeychain.delete("isLoginIn")
TegKeychain.delete("userToken_keyChain")
TegKeychain.delete("userName_keyChain")
self.refreshActionLatestController?.viewWillAppear(true) //doesn't work,keep showing me nil at carTableView
//self.refreshActionLatestController?.searchForResults(true)
// I already initialize that main view controlller,but table view of that main view still showing nil when i created output of it.
self.userEmail.titleLabel?.text = "Sign In"
self.userEmail.enabled = true
self.btnLogOut.enabled = false
self.btnLogOut.hidden = true
else if status == "error"
var alertView:UIAlertView = UIAlertView()
alertView.title = "Log Out Failed!"
alertView.message = "Connection Failed"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
else
TegKeychain.delete("userEmail_keyChain")
TegKeychain.delete("isLoginIn")
TegKeychain.delete("userToken_keyChain")
TegKeychain.delete("userName_keyChain")
self.userEmail.titleLabel?.text = "Sign In"
self.btnLogOut.enabled = false
self.btnLogOut.hidden = true
self.dismissViewControllerAnimated(true, completion: nil)
var alertView:UIAlertView = UIAlertView()
alertView.title = "Already Log Out!"
alertView.message = "You account has been already log out"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
else
var alertView:UIAlertView = UIAlertView()
alertView.title = "Log Out Failed!"
alertView.message = "Connection Failed"
alertView.delegate = self
alertView.addButtonWithTitle("OK")
alertView.show()
)
logOutAlertController.addAction(callAction)
let defaultAction = UIAlertAction(title: "Cancel", style: .Default, handler: nil)
logOutAlertController.addAction(defaultAction)
presentViewController(logOutAlertController, animated: true, completion: nil)
func createStringFromDictionary(dict: Dictionary<String,String>) -> String
var params = String()
for (key, value) in dict
params += "&" + key + "=" + value
return params
这是我的主视图控制器 [这是拍卖车列表]
import UIKit
class AuctionLatestViewController: UIViewController,UITableViewDataSource,UITableViewDelegate,AuctionAPIProtocol
@IBOutlet var carTableView : UITableView?
@IBOutlet var carTableIndicator : UIActivityIndicatorView?
@IBOutlet var retryButton:UIButton?
var latestCars = [AuctionModel]()
var api : AuctionAPI?
var imageCache = [String : UIImage]()
var token : String = " "
var lotId : String = " "
var page : String = " "
override func viewDidLoad()
println("Auction Latest : viewDidLoad")
super.viewDidLoad()
self.setNavigationBarItem()
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .Plain, target: nil, action: nil)
carTableView?.hidden = true
retryButton?.hidden=true
carTableIndicator?.center
carTableIndicator?.startAnimating()
if TegKeychain.get("userToken_keyChain") == nil
token = "null"
else
token = TegKeychain.get("userToken_keyChain")!
lotId = "1"
page = "1"
api = AuctionAPI(delegate: self)
api!.searchAuctionLatestFor(token,lotId: lotId,page: page)
override func viewWillAppear(animated: Bool)
println("Auction Latest : ViewWillAppear")
super.viewWillAppear(animated)
self.setNavigationBarItem()
if TegKeychain.get("userToken_keyChain") == nil
token = "null"
else
token = TegKeychain.get("userToken_keyChain")!
lotId = "1"
page = "1"
api = AuctionAPI(delegate: self)
api!.searchAuctionLatestFor(token,lotId: lotId,page: page)
//Table View DataSource and Delegate
// Implementing the json results from api.
func didReceiveAPIResults(results: NSDictionary)
var resultsArr: NSArray = results["body"] as NSArray //fix
dispatch_async(dispatch_get_main_queue(),
self.latestCars = AuctionModel.latestWithJSON(resultsArr)
println(self.carTableView)
self.carTableView?.reloadData() // I reload the table view
println(self.carTableView)// which return nil when i called from Slide Menu Controller.But return data,if the main view controller called.
self.retryButton?.hidden=true
self.retryButton?.enabled=false
self.carTableIndicator?.stopAnimating()
self.carTableView?.hidden = false
)
// The function that i call from slide menu when log out
func searchForResults(search:Bool)
println("Search Again")
retryButton?.enabled=false
retryButton?.hidden=true
carTableIndicator?.startAnimating()
api = AuctionAPI(delegate: self)
if TegKeychain.get("userToken_keyChain") == nil
token = "null"
else
token = TegKeychain.get("userToken_keyChain")!
lotId = "1"
page = "1"
api = AuctionAPI(delegate: self)
api!.searchAuctionLatestFor(token,lotId: lotId,page: page)
//it will go to didReceiveAPIResults() method
这是我的控制台输出，你会在下面看到 nil。
PostData: &appid=9cdcf896d1f54c3c11b0d4839ce26775
Response ==> "status":"authorized"
Status:
Already Sign In
Auction Latest : viewDidLoad
Auction Latest : ViewWillAppear
task completed
Optional(<UITableView: 0x7faa9c852000; framet a=s k( 0c o0m;p l3e2t0e d5
68); clipsToBounds = YES; hidden = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7faa9bda1f00>; layer = <CALayer: 0x7faa9bd9e750>; contentOffset: 0, -64; contentSize: 320, 0>)
Optional(<UITableView: 0x7faa9c852000; frame = (0 0; 320 568); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7faa9bda1f00>; layer = <CALayer: 0x7faa9bd9e750>; contentOffset: 0, -64; contentSize: 320, 91>)
Auction Latest : ViewWillAppear
task completed
Optional(<UITableView: 0x7faa9c852000; frame = (0 0; 320 568); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7faa9bda1f00>; layer = <CALayer: 0x7faa9bd9e750>; contentOffset: 0, -64; contentSize: 320, 91>)
Auction Latest : ViewWillAppear
task completed
Optional(<UITableView: 0x7faa9c852000; frame = (0 0; 320 568); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7faa9bda1f00>; layer = <CALayer: 0x7faa9bd9e750>; contentOffset: 0, -64; contentSize: 320, 91>)
PostData: &email=example.test@gmail.com&appid=9cdcf896d1f54c3c11b0d4839ce26775
Response code: 200
Response ==> "status":"ok"
Status:
Error:
Log Out SUCCESS
Auction Latest : ViewWillAppear
task completed
nil
有什么想法吗？有什么建议吗？我为我的问题留下了评论。希望对您有所帮助
【问题讨论】：
【参考方案1】：要更新该菜单，您必须调用已获取该表视图的类的方法，为此您要做一件事， 将该类的对象创建到您要更新的其他类中，然后通过调用该类的方法，例如..
[sliderpage viewWillAppear:YES];
这里的silderpage是一个菜单页面的对象......
我希望这对你有帮助....
【讨论】：
嗯，如果你不介意，请迅速解释，因为我不知道你所说的任何事情。从你的解释看，我确实使用 AuctionLatestViewController 初始化了 refreshActionLatestController（见左侧菜单控制器的顶部）。当用户点击注销时，我在左侧菜单控制器上调用了类似“self.refreshActionLatestController?.viewWillAppear(true)”的视图控制器类。所以，这也没有解决。我更新了代码 对不起，我不太了解斯威夫特以上是关于当我从另一个视图控制器调用时，为啥我的表视图为零？的主要内容，如果未能解决你的问题，请参考以下文章