swift - 在 swift 中加载 UIWebView 中的 URL 时发生 fatal error

Question

我正在使用 UISplitViewController 以所有可见模式显示主页面和详细信息页面。仅限纵向。我在 masterVC 中使用可扩展 TableView 。所以我在部分添加了一个 View 。如果我点击该 View ，URL 应该反射(reflect)在 webView 中，具体为 VC。但是，对于我的代码，我收到一个错误。我没有为此使用任何导航 Controller 。我直接将 splitViewController 连接到主视图 Controller 和详细 View Controller 。我在下面描述了。请帮助我。

详细 View Controller

func webViewLoader()
    {
        println("Came Inside Web View")
        let url = "http://makeapppie.com/2014/10/28/swift-swift-using-uiwebviews-in-swift/"
        let requestURL = NSURL(string:url)
        let request = NSURLRequest(URL: requestURL!)
        webView.loadRequest(request) //FATAL ERROR WHILE UNWRAPPING
    }

在主视图 Controller 中

func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {

        let headerView = UIView(frame: CGRectMake(0, 0, sideTableView.frame.size.width, 49)) //ADDING VIEW TO SECTION - FOR EXPANDABLE TABLEVIEW
        var layerLine = CALayer()
        layerLine.frame = CGRect(x: 0, y: headerView.frame.size.height, width:  headerView.frame.size.width, height: 1)
        layerLine.backgroundColor = UIColor(red: 220/255, green: 220/255, blue: 220/255, alpha: 1.0).CGColor
        headerView.backgroundColor = UIColor(red: 242/255, green: 242/255, blue: 242/255, alpha: 1.0)
        headerView.tag = section

        headerView.layer.addSublayer(layerLine) //ADDING BOTTOM BORDER TO CELL

        let headerString = UILabel(frame: CGRect(x: 10, y: 10, width: sideTableView.frame.size.width-10, height: 30)) as UILabel
        headerString.text = sideTblData.objectAtIndex(section) as! NSString as String
        headerString.font = headerString.font.fontWithSize(15)
        headerView .addSubview(headerString)

        let headerTapped = UITapGestureRecognizer (target: self, action: "sectionHeaderTapped:")
        headerView .addGestureRecognizer(headerTapped)
        return headerView
    }

在sectionHeaderTapped

func sectionHeaderTapped(recognizer: UITapGestureRecognizer) {
        let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let vc : DetailVC = storyboard.instantiateViewControllerWithIdentifier("web-link") as! atlDetailVC
        vc.webViewLoader()
}

在viewDidLoad中

let url = "http://makeapppie.com/2014/10/28/swift-swift-using-uiwebviews-in-swift/"
let requestURL = NSURL(string:url)
let request = NSURLRequest(URL: requestURL!)
webView.loadRequest(request) //It is working. But, in method call, why I am getting fatal error??

Answer 1

我创建了一个类似的应用程序，但我的代码没有问题。这是我的代码:

class MasterViewController: UITableViewController{
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 5
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! UITableViewCell

        cell.textLabel?.text = "\(indexPath.row)"

        return cell
    }

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        let dvc = self.splitViewController?.viewControllers.last as! DetailViewController

        dvc.webViewLoader()
    }
}

class DetailViewController: UIViewController {
    @IBOutlet weak var WebView: UIWebView!

    func webViewLoader() {
        println("Came Inside Web View")
        let url = "http://www.google.com"
        let requestURL = NSURL(string:url)
        let request = NSURLRequest(URL: requestURL!)
        WebView.loadRequest(request) //FATAL ERROR WHILE UNWRAPPING
    }
}

更新1

我已经上传了 Project