ios - 注销时清除所有 View Controller

Question

我注意到当用户注销时，所有以前的 View Controller 对象仍存储在内存中

注销页面中的当前代码:

 @IBAction func LogOutClicked(sender: AnyObject)
{
    let appDomain = NSBundle.mainBundle().bundleIdentifier
    NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain!)
    self.performSegueWithIdentifier("goto_loginpage", sender: self)

}

首页当前代码:

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated);


    MyVariables.prefs = NSUserDefaults.standardUserDefaults()
    let isLoggedIn:Int = MyVariables.prefs.integerForKey("ISLOGGEDIN") as Int

    //not logged in
    if (isLoggedIn != 1)
    {
        self.performSegueWithIdentifier("goto_login", sender: self)
    }
        //logged in
    else
    {
      // Start Filling objects with data
    }
}

注销按钮位于与我试图从内存中清除并从中删除所有对象的 View Controller 不同的 View Controller 上

Answer 1

我找到了 this post .虽然它是针对单例的，但它可能会有所帮助:

I think the answer lies not in destroying the singleton object and recreating it, but to actually clear the instance variables within that singleton object.

You don't show the declaration of [CSAppData inbox], but if it's an NSMutableArray, for example, then you can clear that, and any existing references to the singleton object can remain:

+(void) clearData {
    CSAppData *appData = [CSAppData appData];
    [appData.inbox removeAllObjects];
}

可能必须阅读问题才能获得代码的一些上下文，但这种变体可能有效:

func init() -> AnyObject {
    self = super()
    if self {
        self.inbox = CSInbox()
    }
    return self
}

class func appData() -> CSAppData {
    static var appDataInstance: CSAppData
            if !appDataInstance {
            appDataInstance = CSAppData()
        }

    return appDataInstance
}

class func clearData() {
    var appData: CSAppData = CSAppData.appData()
    appData.inbox.removeAllObjects()
}

我用正确的函数替换了 clearData 函数，而不是在其中保留旧函数。

CSInbox。您也许可以忽略这一点，但我不确定。我认为这被替换为一个包含您的结构的类

class CSInbox: NSObject {
    var threads: [AnyObject]?

    var newCount: Int?

    var lastUpdate: NSDate?

    func setThreadsFromJSON(json: [NSObject : AnyObject]) {
    }
}

CSInboxViewController 替换为您的 View Controller

class CSInboxViewController: UITableViewController, UITableViewDataSource, UITableViewDelegate, CSThreadViewControllerDelegate {
    @IBOutlet var inboxTableView: UITableView!

    var inbox: CSInbox?  // <=== This is replaced with variables containing your class(es)
}

这是 CSAppData 类:

class CSAppData: NSObject {
    var inbox: CSInbox?  // <=== This is replaced with variables containing your class(es)

    class func appData() -> CSAppData {
    }

    class func clearData() {
    }
}

我会根据需要继续更新这个答案。