Question

我的登录屏幕上有以下文字：

带下划线的文本是可单击的。我点击条款和条件：

然后我被发送到此屏幕。现在，点击“返回”后：

1）文本不见了：

2）出现导航栏占位符：

此占位符的外观似乎在某种程度上缩小了视图。

屏幕上的“之前”图片：

屏幕上的“之后”图片：

而且-确保两个登录按钮的大小（高度，宽度）相同且彼此靠近的最佳方法是什么？我尝试过：

FacebookSignInButton.frame = CGRect(x: self.view.frame.width/2, y: self.view.frame.height/2, width: GoogleSignInButton.frame.width, height: GoogleSignInButton.frame.height)

不起作用（您现在看到的视图正在使用此代码行）

查看条款和条件的代码：

class PolicyViewController: UIViewController
{
    var policy = PolicyModel(policy: "")
    {
        didSet { updateViews() }
    }
    @IBOutlet var HeaderLabel: UILabel!

    @IBOutlet var TextToDisplay: UITextView!


    override func viewDidLoad()
    {
        super.viewDidLoad()

        self.navigationController?.setNavigationBarHidden(false, animated: true)
        updateViews()
        Constants.logger.debug("PolicyViewController loaded")
    }

    private func updateViews()
    {
        guard isViewLoaded else { return }
        HeaderLabel.text = policy.title
        TextToDisplay.text = policy.body
    }
}

主登录屏幕中的代码（可单击文本）：

@IBAction func AcceptanceTextTapped(_ sender: UITapGestureRecognizer)
    {
        let text = (AcceptanceText.text)!
        let termsRange = (text as NSString).range(of: LocalizationStrings.Login.TERMS_AND_CONDITIONS)
        let privacyRange = (text as NSString).range(of: LocalizationStrings.Login.PRIVACY_POLICY)

        if sender.didTapAttributedTextInLabel(label: AcceptanceText, inRange: termsRange)
        {
            performSegue(withIdentifier: "segue_to_tc", sender: self)
        }
        else if sender.didTapAttributedTextInLabel(label: AcceptanceText, inRange: privacyRange)
        {
            performSegue(withIdentifier: "segue_to_p", sender: self)
        }
    }


    override func prepare(for segue: UIStoryboardSegue, sender: Any?)
    {
        switch (segue.identifier ?? "", segue.destination)
        {
            case ("segue_to_tc", let destination as PolicyViewController):
                destination.policy = PolicyModel(policy: "TS")
            case ("segue_to_p", let destination as PolicyViewController):
                destination.policy = PolicyModel(policy: "PP")
            case ("segue_facebook_login", let destination as UITabBarController) :
                prepareTabBarUI(tabBar: destination)

            default: super.prepare(for: segue, sender: sender)
        }
    }

// This extension serves to be able to identify tapping on the text of Acceptance and Privacy Policy
extension UITapGestureRecognizer
{
    func didTapAttributedTextInLabel(label: UILabel, inRange targetRange: NSRange) -> Bool
    {
        // Create instances of NSLayoutManager, NSTextContainer and NSTextStorage
        let layoutManager = NSLayoutManager()
        let textContainer = NSTextContainer()
        let textStorage = NSTextStorage(attributedString: label.attributedText!)

        // Configure layoutManager and textStorage
        layoutManager.addTextContainer(textContainer)
        textStorage.addLayoutManager(layoutManager)

        // Configure textContainer
        textContainer.lineFragmentPadding = 0.0
        textContainer.lineBreakMode = label.lineBreakMode
        textContainer.maximumNumberOfLines = label.numberOfLines
        let labelSize = label.bounds.size
        textContainer.size = labelSize

        // Find the tapped character location and compare it to the specified range
        let locationOfTouchInLabel = self.location(in: label)
        let textBoundingBox = layoutManager.usedRect(for: textContainer)

        let textContainerOffset = CGPoint( x: (labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
                                           y:  (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y);
        let locationOfTouchInTextContainer = CGPoint(x: locationOfTouchInLabel.x - textContainerOffset.x,
                                                     y: locationOfTouchInLabel.y - textContainerOffset.y);
        let indexOfCharacter = layoutManager.characterIndex(for: locationOfTouchInTextContainer, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)

        return NSLocationInRange(indexOfCharacter, targetRange)
    }

}

编辑：

故事板图片：

Answer 1

因此，您使用segue使用情节提要调用了另一个viewController。但是看来您使用模态呈现 segue来调用另一个viewController。您需要调用的是显示（推送）。您可以在这里阅读更多有关segue的信息：https://developer.apple.com/library/archive/featuredarticles/ViewControllerPGforiPhoneOS/UsingSegues.html 要解决您的问题，只需将您的segue类型更改为在情节提要中显示为

“返回”按钮后出现意外行为

1 个答案: