Question 130939 in Xcode Question posted in
Whether you're new to Xcode or an experienced developer, our archive has everything you need to know about this integrated development environment (IDE). From basic functionalities to advanced features, our archive covers a wide range of Xcode-related questions and answers. Browse our archive now and find solutions to your Xcode questions, and take your app development skills to the next level

Xcode – Swift 5 & sheetPresentationController passing data

I am learning swift and trying to pass a variable to a sheet but it isn’t changing the variable when the sheet pops up, is there a different way to do this?

let bottomSheet = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "bottomSheet")
    
    if let sheet = bottomSheet.sheetPresentationController{
        sheet.detents = [.medium()]
        sheet.prefersGrabberVisible = true
        sheet.preferredCornerRadius = 24
        sheet.prefersGrabberVisible = true
    }

    bottomSheet.isEnabled = true
    self.present(bottomSheet, animated: true, completion: nil)

And in the bottomSheet view controller I have the variable

var isEnabled: Bool = false

But even though I put true it always shows as false

Tags:

2

Answers


  1. 0

    Try it like this, what you need to do is specify it as a view controller.

    let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
if let bottomSheet = mainStoryboard.instantiateViewController(withIdentifier: "bottomSheet") as? BottomSheetVC{
        if let sheet = bottomSheet.sheetPresentationController{
            sheet.detents = [.medium()]
            sheet.prefersGrabberVisible = true
            sheet.preferredCornerRadius = 24
            sheet.prefersGrabberVisible = true
        }
        
        bottomSheet.isEnabled = true
        self.present(bottomSheet, animated: true)
    }
    Login or Signup to reply.
  2. 0

    sheetPresentationController only work for ios 15 and later, for previously versions you need to set .custom modalPresentationStype

            controller.modalPresentationStyle = .pageSheet
        if #available(iOS 15.0, *) {

            if let sheet = controller.sheetPresentationController {
                sheet.detents = [.medium()]
            }
            
        } else {
            
            controller.modalPresentationStyle = .custom
            controller.transitioningDelegate = self
        }
        self.present(controller, animated: true, completion: nil)

    // MARK: – UIViewControllerTransitioningDelegate

    extension CPPdfPreviewVC: UIViewControllerTransitioningDelegate {


func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
    PresentationController(presentedViewController: presented, presenting: presenting)
    }

    and Add Presentation controller as given

    class PresentationController: UIPresentationController {

  let blurEffectView: UIVisualEffectView!
  var tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer()
  
  override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
      let blurEffect = UIBlurEffect(style: .dark)
      blurEffectView = UIVisualEffectView(effect: blurEffect)
      super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
      tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(dismissController))
      blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
      self.blurEffectView.isUserInteractionEnabled = true
      self.blurEffectView.addGestureRecognizer(tapGestureRecognizer)
  }
  
  override var frameOfPresentedViewInContainerView: CGRect {
      CGRect(origin: CGPoint(x: 0, y: self.containerView!.frame.height * 0.4),
             size: CGSize(width: self.containerView!.frame.width, height: self.containerView!.frame.height *
              0.6))
  }

  override func presentationTransitionWillBegin() {
      self.blurEffectView.alpha = 0
      self.containerView?.addSubview(blurEffectView)
      self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.alpha = 0.7
      }, completion: { (UIViewControllerTransitionCoordinatorContext) in })
  }
  
  override func dismissalTransitionWillBegin() {
      self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.alpha = 0
      }, completion: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.removeFromSuperview()
      })
  }
  
  override func containerViewWillLayoutSubviews() {
      super.containerViewWillLayoutSubviews()
    presentedView!.roundCorners([.topLeft, .topRight], radius: 22)
  }

  override func containerViewDidLayoutSubviews() {
      super.containerViewDidLayoutSubviews()
      presentedView?.frame = frameOfPresentedViewInContainerView
      blurEffectView.frame = containerView!.bounds
  }

  @objc func dismissController(){
      self.presentedViewController.dismiss(animated: true, completion: nil)
  }
}

extension UIView {
  func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
      let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners,
                              cornerRadii: CGSize(width: radius, height: radius))
      let mask = CAShapeLayer()
      mask.path = path.cgPath
      layer.mask = mask
  }
}

    }
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search