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CollectionView Cell size only updating after Scroll
In my collection view I have an image with some text below. I have a height constraint for the image view so the image aspect ratio can be adjusted (cells are the width of the screen). I set the constraint constant in cellForItemAt. The cell heights only resize correctly after I scroll. CollectionViewController     override func viewDidLoad(_ animated: Bool) {         super.viewDidLoad(animated)         let layout = collectionView.collectionViewLayout         if let flowLayout = layout as? UICollectionViewFlowLayout {             flowLayout.estimatedItemSize = CGSize(width: collectionView.widestCellWidth, height: 800)         }     }     override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! selectCell         cell.setupView() // Image resolution is already downloaded         let gsReference = storage.reference(forURL: thumbnail.storageLocation)         cell.imageView.sd_setImage(with: gsReference, placeholderImage: nil)         cell.layoutIfNeeded()         cell.layoutSubviews()         return cell     } selectCell.swift     override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {         var targetSize = targetSize         targetSize.height = CGFloat.greatestFiniteMagnitude         let size = super.systemLayoutSizeFitting(targetSize, withHorizontalFittingPriority: .required, verticalFittingPriority: .fittingSizeLevel)         return size     }     func setupView() { // Changing the labels size the cell correctly when first loaded             titleLbl.text = ""             descriptionLbl.text = ""                          let imageAspectRatio = CGFloat(metadata.thumbnail.width) / CGFloat(metadata.thumbnail.height)             let imageViewHeight = containerView.frame.width / imageAspectRatio             imageViewHeightConstraint.constant = imageViewHeight             self.contentView.setNeedsLayout()             self.contentView.layoutIfNeeded()     }
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1.5k
Aug ’22
How to add Apple Music style filters to Search Controller?
I’m trying to add a search filter UI like the one used in the Music app. I’ve tried to add a reusable view to the search controller collection view but there seems to be padding around it. My plan was just to add a Collection View there and try recreate the animation used. I tried scope buttons but those are a segment control, so they only hold a few options.
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772
Oct ’22
How to send touch events to another view?
In my view controller I have a collection view and over that there is a scroll view (covering the whole main view). The collection view acts as a sort of "header" to the scroll view and has images in it. The scrollview has a clear view at the top the same size as the collection view to make the collection view visible through the scrollview - collectionViewTouchView. This is done so I can create a parallax effect when scrolling. The problem is that I can't swipe on the collection view because the scrollview is over it. Can I somehow record touch events on collectionViewTouchView and then pass it directly to the collection view?
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1.1k
Nov ’22
How to save login details to Keychain?
In my app user accounts are handled with Firebase Auth. When creating a user how can I get the system to suggest a Unique password (that prompt that comes up on the keyboard) and also how can i get it to save these details to the keychain. My app will have a website in the future so I want the details come up when the user tries to login there. When the user logs in i used the func below to save the details to the keychain, it says the details have been saved but it doesnt seem to come up in the passwords tab in Settings. func saveCredentialsToKeychain(email: String, password: String) { let query: [String: Any] = [ kSecClass as String: kSecClassInternetPassword, kSecAttrServer as String: "myWebsite.com", kSecAttrAccount as String: email, kSecValueData as String: password.data(using: .utf8)!, kSecAttrAccessible as String: kSecAttrAccessibleWhenUnlocked ] let status = SecItemAdd(query as CFDictionary, nil) if status == errSecSuccess { print("Credentials saved to Keychain") } else { print("Error saving credentials to Keychain: \(status)") } }
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803
Nov ’23
CollectionView not calling didSelectItemAt correctly
I have a CollectionView in my SwiftUI App. The collectionView is wrapped in a UIViewRepresentable. If I tap on a collectionView cell normally the function isn't called but if I hold the cell down the console prints <0x107507790> Gesture: System gesture gate timed out. and when I let go of the cell after that's printed then didSelectItem is called. Here is my CollectionView Class: class SessionsCollectionView: UIView, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout { lazy var collectionView: UICollectionView = { let layout = UICollectionViewFlowLayout() layout.minimumInteritemSpacing = 0 layout.minimumLineSpacing = 30 let collectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: layout) collectionView.translatesAutoresizingMaskIntoConstraints = false collectionView.dataSource = self collectionView.delegate = self collectionView.clipsToBounds = false collectionView.delaysContentTouches = false collectionView.register(SessionCell.self, forCellWithReuseIdentifier: "cell") collectionView.register(SessionsHeader.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "header") return collectionView }() override init(frame: CGRect) { super.init(frame: frame) self.backgroundColor = .clear setupCollectionView() } required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") } private func setupCollectionView() { addSubview(collectionView) collectionView.backgroundColor = .clear collectionView.alwaysBounceVertical = true collectionView.alwaysBounceHorizontal = false collectionView.delaysContentTouches = false collectionView.contentInset = .init(top: 20, left: 0, bottom: 20, right: 0) collectionView.showsVerticalScrollIndicator = false NSLayoutConstraint.activate([ collectionView.topAnchor.constraint(equalTo: topAnchor), collectionView.leadingAnchor.constraint(equalTo: leadingAnchor), collectionView.trailingAnchor.constraint(equalTo: trailingAnchor), collectionView.bottomAnchor.constraint(equalTo: bottomAnchor) ]) } // MARK: Header func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView { if kind == UICollectionView.elementKindSectionHeader { let sectionHeader = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "header", for: indexPath) as! Header return sectionHeader } } func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize { let width: CGFloat = collectionView.frame.width let height: CGFloat = 33 + 20 return CGSize(width: width, height: height) } // MARK: - UICollectionViewDataSource func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return 10 } func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! SessionCell return cell } // MARK: - UICollectionViewDelegateFlowLayout func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { let width = collectionView.bounds.width let height = 150 return CGSize(width: collectionView.bounds.width, height: height) } func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { print(indexPath.row) } } struct SessionsCollectionViewWrapper: UIViewRepresentable { var sessionViewNavigation: SessionViewNavigation func makeUIView(context: Context) -> SessionsCollectionView { let sessionsCollectionView = SessionsCollectionView() return sessionsCollectionView } func updateUIView(_ uiView: SessionsCollectionView, context: Context) { // Update any properties or handle updates if needed } }
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1.8k
Feb ’24