Question

通过编程方式解除ViewController我遇到了问题。我连接了两个控制器，如果按下按钮，将显示控制器。这是我的prepareForSegue方法：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let VC = VC()
    let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
    let blurredView = UIVisualEffectView(effect: blurEffect)
    blurredView.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height + 64)

    VC.view.frame = self.view.bounds
    VC.view.backgroundColor = UIColor.clearColor()
    VC.view.addSubview(blurredView)
    VC.modalPresentationStyle = UIModalPresentationStyle.OverCurrentContext

    var masterViewOfVC = (segue.destinationViewController as! SubjectSelectionViewController).masterView

    blurredView.addSubview(masterViewOfVC)

    masterViewOfVC.setTranslatesAutoresizingMaskIntoConstraints(false)

    let views = ["masterView": masterViewOfVC]

    let horizontalConstraintsForMasterView = NSLayoutConstraint.constraintsWithVisualFormat("H:|[masterView]|", options: .AlignAllCenterY, metrics: nil, views: views)
    blurredView.addConstraints(horizontalConstraintsForMasterView)
    let verticalConstraintsForMasterView = NSLayoutConstraint.constraintsWithVisualFormat("V:|[masterView]|", options: .AlignAllCenterX, metrics: nil, views: views)
    blurredView.addConstraints(verticalConstraintsForMasterView)

    (segue.destinationViewController as! VC).viewDidLoad()

    self.presentViewController(VC, animated: true, completion: nil)
}

所以，如果我试图解雇它，它什么都不做。我已经检查过按钮是否正常工作了。

以下是来自其他控制器的代码：

// viewDidLoad中

cancelButton.setTitle("Abbrechen", forState: UIControlState.Normal)
    cancelButton.tintColor = UIColor.whiteColor()
    cancelButton.addTarget(self, action: Selector("buttonAction:"), forControlEvents: UIControlEvents.TouchUpInside)
    cancelButton.enabled = true

//我的功能

func buttonAction(sender:UIButton!) {
    VC().dismissViewControllerAnimated(true, completion: nil)
}

更新

我在Storyboard中删除了segue，并在我的Button的IBAction中创建了一个模态segue。我也在这个动作中初始化了我的“关闭按钮”。

以下是来自parentViewController的代码：

@IBAction func SubjectSelctionButtonPressed(sender: UIBarButtonItem) {
    let subjectSelectionViewController = SubjectSelectionViewController()
    let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
    let blurredView = UIVisualEffectView(effect: blurEffect)
    blurredView.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height + 64)

    subjectSelectionViewController.view.frame = self.view.bounds
    subjectSelectionViewController.view.backgroundColor = UIColor.clearColor()
    subjectSelectionViewController.view.addSubview(blurredView)
    subjectSelectionViewController.modalPresentationStyle = UIModalPresentationStyle.OverCurrentContext

    var masterViewOfSubjectSelection = SubjectSelectionViewController().masterView
    var buttonOfSubjectSelection = SubjectSelectionViewController().cancelButton

    buttonOfSubjectSelection.setTitle("Abbrechen", forState: UIControlState.Normal)
    buttonOfSubjectSelection.tintColor = UIColor.whiteColor()
    buttonOfSubjectSelection.addTarget(self, action: Selector("buttonAction:"), forControlEvents: UIControlEvents.TouchUpInside)

    blurredView.addSubview(masterViewOfSubjectSelection)
    masterViewOfSubjectSelection.addSubview(buttonOfSubjectSelection)

    masterViewOfSubjectSelection.setTranslatesAutoresizingMaskIntoConstraints(false)

    let views = ["masterView": masterViewOfSubjectSelection]

    let horizontalConstraintsForMasterView = NSLayoutConstraint.constraintsWithVisualFormat("H:|[masterView]|", options: .AlignAllCenterY, metrics: nil, views: views)
    blurredView.addConstraints(horizontalConstraintsForMasterView)
    let verticalConstraintsForMasterView = NSLayoutConstraint.constraintsWithVisualFormat("V:|[masterView]|", options: .AlignAllCenterX, metrics: nil, views: views)
    blurredView.addConstraints(verticalConstraintsForMasterView)

    self.presentViewController(subjectSelectionViewController, animated: true, completion: nil)
}

，按钮的操作如下所示：

func buttonAction(sender:UIButton!) {
    dismissViewControllerAnimated(true, completion: nil)
}

现在好了，当控制器出现时，除了我在动作中创建的元素之外什么也没有。调用我的呈现控制器的viewDidLoad（）方法，但不会调用约束和格式...

这是我的modalViewController的viewDidLoad（）：

        titleLabel.setTranslatesAutoresizingMaskIntoConstraints(false)
    cancelButton.setTranslatesAutoresizingMaskIntoConstraints(false)
    separatorLine.setTranslatesAutoresizingMaskIntoConstraints(false)
    subjectsTableView.setTranslatesAutoresizingMaskIntoConstraints(false)

    subjectsTableView.delegate = self

    titleLabel.text = "Unterrichtsfächer"
    titleLabel.textColor = UIColor.whiteColor()
    titleLabel.font = UIFont(name: "HelveticaNeue-Medium", size: 17)

    separatorLine.backgroundColor = UIColor.whiteColor()

    subjectsTableView.backgroundColor = UIColor.clearColor()

    masterView.addSubview(titleLabel)
    masterView.addSubview(cancelButton)
    masterView.addSubview(separatorLine)
    masterView.addSubview(subjectsTableView)

    let views = ["line": separatorLine, "title": titleLabel, "button": cancelButton, "table": subjectsTableView]

    let verticalConstraintsForElements = NSLayoutConstraint.constraintsWithVisualFormat("V:|-64-[line(2)][table]|", options: .AlignAllCenterX, metrics: nil, views: views)
    masterView.addConstraints(verticalConstraintsForElements)
    let horizontalConstraintsForSeparatorLine = NSLayoutConstraint.constraintsWithVisualFormat("H:|[line]|", options: .AlignAllCenterY, metrics: nil, views: views)
    masterView.addConstraints(horizontalConstraintsForSeparatorLine)
    let horizontalConstraintsForTableView = NSLayoutConstraint.constraintsWithVisualFormat("H:|[table]|", options: .AlignAllCenterY, metrics: nil, views: views)
    masterView.addConstraints(horizontalConstraintsForTableView)

    let verticalConstraintsForTitleLabel = NSLayoutConstraint.constraintsWithVisualFormat("V:[title(21)]-11-[line]", options: .AlignAllCenterX, metrics: nil, views: views)
    masterView.addConstraints(verticalConstraintsForTitleLabel)

    let horizontalAlignmentForTitleLabel = NSLayoutConstraint(item: titleLabel, attribute: NSLayoutAttribute.CenterX, relatedBy: .Equal, toItem: masterView, attribute: .CenterX, multiplier: 1, constant: -18)
    masterView.addConstraint(horizontalAlignmentForTitleLabel)
    let widthForTitleLabel = NSLayoutConstraint(item: titleLabel, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 137)
    masterView.addConstraint(widthForTitleLabel)

    let verticalConstraintsForCancelButton = NSLayoutConstraint.constraintsWithVisualFormat("V:[button(30)]-6-[line]", options: .AlignAllCenterX, metrics: nil, views: views)
    masterView.addConstraints(verticalConstraintsForCancelButton)
    let horizontalConstraintsForCancelButton = NSLayoutConstraint.constraintsWithVisualFormat("H:[button(90)]-7-|", options: .AlignAllCenterY, metrics: nil, views: views)
    masterView.addConstraints(horizontalConstraintsForCancelButton)

任何人都可以帮助我吗？非常感谢!!!

Answer 1

我还没有真正检查过您的所有代码，但要快速修复它，您可以将VC的实例设为类属性。

所以它看起来像这样：

class MainViewController: UIViewController {
    var VC = UIViewController() // I would use an optional here but I've been down voted for suggesting people to use optionals.

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        VC = VC()

        // Your code
    }

    func buttonAction(sender:UIButton!) {
        VC.dismissViewControllerAnimated(true, completion: nil)
    }
}

我假设您正在使用某种主 - 详情视图，因此当您转到buttonAction时仍可访问VC。

如果buttonAction是VC本身的一种方法，那么只需在我自己的dissmissViewControllerAnimated()上调用：

func buttonAction(sender:UIButton!) {
    dismissViewControllerAnimated(true, completion: nil)
}

无论哪种方式，您都必须在dissmissViewControllerAnimated()的实例上调用VC。使用VC()，您只需创建一个新实例，其中没有＆＃34;没有＆＃34;与已经存在的那个有关。

<强>更新：
如果您在故事板中创建了SubjectSelectionViewController()，那么您可能希望将其实例化为：

let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let subjectSelectionViewController  = storyboard.instantiateViewControllerWithIdentifier("YourIdentifier") as! SubjectSelectionViewController

Answer 2

你的问题是你没有推动其他视图忽略它，你只是在另一个视图的顶部添加新的视图控制器你需要替换这一行

blurredView.addSubview(masterViewOfVC)

对于

presentViewController(masterViewOfVC, animated: true, completion: nil)

现在，当您调用dismiss视图控制器时，所有应该正常工作

无法解雇ModalViewController

2 个答案: