CODEWITHSUNDEEP
iosswiftuicollectionviewuicollectionviewcell
Ashish P
Ashish P

Reputation: 3056

Display popup below selected UICollectionViewCell

I'm working to display popup which should be display below to selected cell.

I have two view controller, both contains UICollectionView. So when I select cell from first view controller I want to display popup with animation exactly below selected cell.

I have tried following code to display it.

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    if self.signupFirstStepVC != nil {
        self.signupFirstStepVC?.view.removeFromSuperview()
        self.signupFirstStepVC = nil
    }

    let cell = collectionView.cellForItem(at: indexPath) as! MainCategoryCVC
    collectionView.scrollToItem(at: indexPath, at: .top, animated: true)    
    self.signupFirstStepVC = SignupFirstStepVC.viewController()

    let viewFrame = self.signupFirstStepVC?.view.frame

    self.signupFirstStepVC?.view.frame = CGRect(x: viewFrame!.origin.x, y: cell.lblCategoryName.frame.maxY, width: collectionView.frame.size.width, height: collectionView.frame.size.height - 100)    

    UIView.transition(from: cell, to: self.signupFirstStepVC!.view, duration: 0.5, options: .transitionCrossDissolve) { (success) in
        self.view.addSubview(self.signupFirstStepVC!.view)
    }    
}

This code worked, but not display proper view as I have expected.

Output:

Add Hobbies

You can see in above image, my popup is added, but origin start from UICollectionView's origin instead of cell's lblCategoryName's maxY.

Expected:

Expected Add Hobbies

Upvotes: 2

Views: 1772

Answers (3)

dahiya_boy
dahiya_boy

Reputation: 9503

Actually you need to add self.view.safeAreaInsets.top with the maxY.

Code Work :

    let topDisplaceHeight =  self.view.safeAreaInsets.top

    let cell = colView.cellForItem(at: indexPath)

    let pWidth : CGFloat = self.view.bounds.width - 40
    let pHeight : CGFloat = 300

    self.viewPopup.frame = CGRect(origin: CGPoint(x: self.view.bounds.width/2 -  pWidth/2,
                                                  y: (cell?.frame.maxY)! + topDisplaceHeight ),
                                  size: CGSize(width: pWidth, height: pHeight))


    self.view.addSubview(self.viewPopup)

Output : iPhone XR

enter image description here

Output : iPhone SE

enter image description here

Upvotes: 1

Prashant Tukadiya
Prashant Tukadiya

Reputation: 16456

You need to convert rect according to superview.

let theAttributes = collectionView.layoutAttributesForItem(at: indexPath)
let cellFrameInSuperview = collectionView.convert(theAttributes.frame, to: collectionView.superview)

Now you have frame according to its superview.

set the frame of view controller using cellFrameInSuperview property

TIP: You should add view controller as child view controller and then add subview to properly manage the view life cycle.

EDIT

Please ignore typo 

self.signupFirstStepVC?.view.frame = CGRect(x: cellFrameInSuperview!.origin.x, y: cellFrameInSuperview.maxY, width: collectionView.frame.size.width, height: collectionView.frame.size.height - 100)

Upvotes: 1

Darshan Kunjadiya
Darshan Kunjadiya

Reputation: 908

Try Like this

let viewFrame = cell?.frame           
self.signupFirstStepVC?.view.frame = CGRect(x: viewFrame!.origin.x, y: viewFrame?.maxY ?? 0.0, width: collectionView.frame.size.width, height: collectionView.frame.size.height - 100)

Hope this will resolve your issue.

Upvotes: 1

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