应用程序总是在进入后台后返回主页

Question

该应用在navigationController下有2个viewControllers，UINavigationController - （根视图） - ＆gt; UIViewController - （目前模态） - ＆gt; UIViewController2。

输入UIViewController2后，按主页并让应用程序进入后台，然后响应应用程序，它的屏幕将返回UIViewController。这发生在真实设备上，但不在模拟器上。

我怀疑是缺少记忆，但UIViewController2中的对象很少。任何其他原因使应用程序这样做？

更新： 当iPhone未与XCode连接时，我发现了问题!!!

我刚刚测试了与Xcode连接的App，当我按下主页按钮进入后台时，App崩溃了！这意味着当我“反应”应用程序时，它实际上会重新启动，它会转到UIViewController。

我收到以下错误

let localfilePath = NSBundle.mainBundle().URLForResource("home", withExtension: "html");
var webViewRequest:NSURLRequest!

override func viewDidLoad() {
    super.viewDidLoad()

    webViewRequest = NSURLRequest(URL: localfilePath!);
    initSubviews()

}

func initSubviews() {
    let fm: CGRect = UIScreen.mainScreen().bounds
    self.mainScrollView = UIScrollView(frame:CGRectMake(0, 0, fm.size.width, fm.size.height))
    self.mainScrollView!.contentSize = CGSizeMake(self.mainScrollView!.frame.size.width * CGFloat(numPages), self.mainScrollView!.frame.size.height)
    self.mainScrollView!.backgroundColor = UIColor.whiteColor()
    self.mainScrollView!.pagingEnabled = true
    self.mainScrollView!.bounces = false
    self.mainScrollView!.showsHorizontalScrollIndicator = false;
    self.mainScrollView!.scrollRectToVisible(CGRectMake(mainScrollView!.frame.size.width, 0, mainScrollView!.frame.size.width, mainScrollView!.frame.size.height), animated: false)
    self.mainScrollView!.delegate = self
    self.view.addSubview(mainScrollView!);

    prevWebView = runFunc.setWebView(0)
    currWebView = runFunc.setWebView(runFunc.screenWidth)
    nextWebView = runFunc.setWebView(runFunc.screenWidth*2)
    currWebView.delegate = self
    prevWebView.delegate = self
    nextWebView.delegate = self
    prevWebView.tag = 0
    currWebView.tag = 1
    nextWebView.tag = 2
    prevWebView.backgroundColor = UIColor.whiteColor()
    currWebView.backgroundColor = UIColor.whiteColor()
    nextWebView.backgroundColor = UIColor.whiteColor()
    mainScrollView.addSubview(prevWebView)
    mainScrollView.addSubview(currWebView)
    mainScrollView.addSubview(nextWebView)

    currWebView.scrollView.delegate = self
    prevWebView.scrollView.delegate = self
    nextWebView.scrollView.delegate = self
    prevWebView.scrollView.decelerationRate = UIScrollViewDecelerationRateNormal 
    currWebView.scrollView.decelerationRate = UIScrollViewDecelerationRateNormal
    nextWebView.scrollView.decelerationRate = UIScrollViewDecelerationRateNormal

    currWebView.loadRequest(webViewRequest);

    NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: "loadPrevNext", userInfo: nil, repeats: false)
}

func loadPrevNext() {
    let prev = getPrev(currVolume, theChapter: currChapter)
    prevVolume = prev["volume"]!
    prevChapter = prev["chapter"]!
    prevChapterArr = runFunc.getLection(prev["volume"]!, theChapter: prev["chapter"]!)

    let next = getNext(currVolume, theChapter: currChapter)
    nextVolume = next["volume"]!
    nextChapter = next["chapter"]!
    nextChapterArr = runFunc.getLection(next["volume"]!, theChapter: next["chapter"]!)

    prevWebView.loadRequest(webViewRequest);
    nextWebView.loadRequest(webViewRequest);

}