SWIFT 中的 NSUserDefaults - 介绍 ViewController

Question

我的应用程序有一个小问题，问题是我有一个介绍屏幕 - 这是一个应该向人们打招呼一次就不会再显示该屏幕的屏幕。问题是我似乎无法将应用程序打开一次 "remember"。我在底部做了一个按钮，我认为我可以将其用作保存按钮，但它不能正常工作。介绍屏幕始终是初始 viewcontroller。

所以我的问题是，有没有办法在按钮上使用 SWIFT 中的 NSUserDefaults，以便当用户单击它一次时。 introscreen 将不会再次打开。用户将被定向到下一个 viewcontroller。在我的例子中是一个表格视图。

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

@IBAction func NextViewcontroller(sender: AnyObject)
{
    let startVC = self.viewControllerAtIndex(0) as ContentViewController
    let viewControllers = NSArray(object: startVC)

    self.pageViewController.setViewControllers(viewControllers as? [UIViewController], direction: .Forward, animated: true, completion: nil)


}

func viewControllerAtIndex(index: Int) -> ContentViewController
{
    if ((self.pageTitles.count == 0) || (index >= self.pageTitles.count)) {
        return ContentViewController()
    }

    let vc: ContentViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ContentViewController") as! ContentViewController

    vc.imageFile = self.pageImages[index] as! String
    vc.titleText = self.pageTitles[index] as! String
    vc.pageIndex = index

    return vc

}



// MARK: - Page View Controller Data Source

func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController?
{

    let vc = viewController as! ContentViewController
    var index = vc.pageIndex as Int


    if (index == 0 || index == NSNotFound)
    {
        return nil

    }

    index--
    return self.viewControllerAtIndex(index)

}

func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {

    let vc = viewController as! ContentViewController
    var index = vc.pageIndex as Int

    if (index == NSNotFound)
    {
        return nil
    }

    index++

    if (index == self.pageTitles.count)
    {
        return nil
    }

    return self.viewControllerAtIndex(index)

}

func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int
{
    return self.pageTitles.count
}

func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int
{
    return 0
}
}

Answer 1

我在我的应用程序中实现了同样的事情

  if let IsTermsVisible = NSUserDefaults.standardUserDefaults().objectForKey(PrefTermsAndCondition) as? Bool {
        print ("BreakIsTermsVisible ")
        if IsTermsVisible == true {
            tncView.hidden = true
        }
        else {
            tncView.hidden = false
        }
    }
    else {
        tncView.hidden = false
        print ("false IsTermsVisible ")
    }

我在视图中添加了一个确定按钮，一旦用户按下确定，它就永远不会显示在应用程序中。

@IBAction func tncBtnClicked(sender: AnyObject) {
    NSUserDefaults.standardUserDefaults().setBool(true, forKey: PrefTermsAndCondition)
    tncView.hidden = true
}

SWIFT 中的 NSUserDefaults - 介绍 ViewController

NSUserDefaults in SWIFT - Intro ViewController

nsuserdefaults

ios

swift