Swift:tableView 总是“在 unwr 时发现 nil..."；在视图控制器内 [英] Swift: tableView always "found nil while unwr..." inside a viewcontroller

问题描述

在 viewController 中，我已经将 SB 中的 tableView outlet 与委托和数据源集连接起来，当我在代码中访问参考出口时，它总是崩溃消息:

In a viewController I've connected a tableView outlet in the SB with delegates and datasource set and when I'm accessing the reference outlet in code it always crashes with the message:

致命错误:解包可选值时意外发现 nil

fatal error: unexpectedly found nil while unwrapping an Optional value

代码如下:

@IBOutlet var resultTabView: UITableView!

连接:

cellForRowAtIndexPath: -
我什至没有使用 resultsArray，尽管该数组正在返回日志中所见的数据

cellForRowAtIndexPath: -
I'm not even using resultsArray, though the array is returning data as seen in the logs

编辑 2:

数据:

id = 2325;    
results =     (
                    {
                city = Delhi;
                company = "AIR CREATOR";
                country = IN;
                date = "Mon, 11 Jul 2016 04:51:34 GMT";
                expired = 0;
                formattedLocation = "Delhi, Delhi";
                formattedLocationFull = "Delhi, Delhi";
                formattedRelativeTime = "30+ days ago";
                jobkey = 67ba422cc328a946;
                jobtitle = "CSA for airport";
                latitude = "28.664835";
                longitude = "77.21429000000001";
                onmousedown = "indeed_clk(this,'3586');";
                snippet = "Providing boarding passes and luggage <b>labels</b>. Your daily tasks will usually include:....";
                source = Indeed;
                sponsored = 0;
                state = DL;
                url = "http://www.indeed.co.in/viewjob?jk=67ba422cc328a946&qd=SHSUhPNSBYpqaNu9AVdfqv81wDpAwFE36uyNVXcxl8VAUThqIJkZA1l3w1yQl8AJg05AJq_aODrwRlOUKXT92UBk4SDqDqM7LhTReglYsV0&indpubnum=4148406673078092&atk=1aqbfaj6kb958c17";
            },
                    {
                city = Delhi;
                company = "Letmedrive India Private Limited";
                country = IN;
                date = "Wed, 10 Aug 2016 13:02:51 GMT";
                expired = 0;
                formattedLocation = "Delhi, Delhi";
                formattedLocationFull = "Delhi, Delhi";
                formattedRelativeTime = "6 days ago";
                jobkey = 89c4f63f1b841720;
                jobtitle = "Graphics Designer";
                latitude = "28.664835";
                longitude = "77.21429000000001";
                onmousedown = "indeed_clk(this,'3586');";
                snippet = "Graphic designers/artists design graphics for use in media products such as magazines, <b>labels</b> &amp; advertising....";
                source = Indeed;
                sponsored = 0;
                state = DL;
                url = "http://www.indeed.co.in/viewjob?jk=89c4f63f1b841720&qd=SHSUhPNSBYpqaNu9AVdfqv81wDpAwFE36uyNVXcxl8VAUThqIJkZA1l3w1yQl8AJg05AJq_aODrwRlOUKXT92UBk4SDqDqM7LhTReglYsV0&indpubnum=4148406673078092&atk=1aqbfaj6kb958c17";
            };

班级:

class JobListViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate{

@IBOutlet var searchField: UITextField!
@IBOutlet var resultTabView: UITableView!

var resultsArray = [JSON]()
var resultsDictionary = [String:String]()


override func viewDidLoad() {
    super.viewDidLoad()
}

func focusSearchField(search:Bool, keyword:String){
    if(search){
        callAPI(keyword)
    }else{
        searchField?.becomeFirstResponder()
    }
}

func callAPI(keyword:String){
    var params = [String:String]()
    params["publisher"] = "2341411"
    params["q"] = keyword
    params["l"] = "dubai"
    params["latlong"] = "1"
    params["v"] = "2"
    params["format"] = "json"
    params["co"] = "uae"
    let svcMgr = ServiceManager()
    svcMgr.httpRequest(self, params: params)
}

func updateUI(result: [String:AnyObject]){
    if let val = result["results"] {
        let json = JSON(val)
        let array = json.arrayValue

        dispatch_async(dispatch_get_main_queue(), {
            for a in array{
                self.resultsArray.append(a)
            }
            self.resultTabView.reloadData()
        })
    }else{

    }
}

// MARK: - Table view data source

func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return resultsArray.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell : UITableViewCell = tableView.dequeueReusableCellWithIdentifier("JobCell", forIndexPath: indexPath) as UITableViewCell
            let labl2 = cell.viewWithTag(2) as! UILabel
            labl2.text = (resultsArray[indexPath.row]["jobtitle"].stringValue)+" @"+(resultsArray[indexPath.row]["source"].stringValue)
            let labl3 = cell.viewWithTag(3) as! UILabel
            labl3.text = (resultsArray[indexPath.row]["state"].stringValue)+", "+(resultsArray[indexPath.row]["country"].stringValue)
            let labl4 = cell.viewWithTag(4) as! UILabel
            labl4.text = (resultsArray[indexPath.row]["snippet"].stringValue)+" "
            tableView.estimatedRowHeight = 80
            tableView.rowHeight = UITableViewAutomaticDimension
            return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    UIApplication.sharedApplication().openURL(NSURL(string: resultsArray[indexPath.row]["url"].stringValue)!)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// MARK: - TextField delegate

func textFieldShouldReturn(textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    callAPI(textField.text!)
    return true
}

推荐答案

确保在尝试访问表视图之前调用了 viewDidLoad 方法.在此代码运行时，您与 XIB 的连接可能尚未建立.

Make sure the viewDidLoad method is called before attempting to access the table view. Your connection from XIB is probably not established by the time this code runs.

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