Post not yet marked as solved
Hi together,
i have truble to parse an json with an array like following:
"data": [
[
0000000000,
[
{
"count": 0
}
]
],
[
0000000000,
[
{
"count": 0
}
]
]
],
Can someone help me to parse that with the this?
Thanks
Post not yet marked as solved
Hi, developers!
I use DiffableDataSource for myTableView and was surprised when I found that TableView in this case caches previously created cells after (or before) a new update. It seems that this is implemented to store cell states and quickly update if the contents of the table change.
Because of this mechanism, I have the following problem: my cells use reference-type view models, which in turn contain notification observers from the file upload service. The view model is connected to the cell with a closure, which is called upon notification and updates, for example, the progress scale in the cell
After uploading the file, I make a new applySnapshot using similar models with cameras (but, for example, the "fileName" field is already different, so I need to change it in cell).
Due to caching of cells in memory, the old view models with observers are not released, as a result, I get two observers, for two different cells, one of which is visible, and the second is not. This causes problems with UI. To summarize, my question is, is it possible to disable cell caching or clean the cache if using Diffable Data Source manually?
Post not yet marked as solved
I need to create a carousel component with the following requirements (sorted by relevance):
Objectives
Every image is 16:9 aspect ratio and resizes to fit the screen.
Needs a zoom and pan functionality, possibly the same way as iOS Photos app.
Needs to work both in landscape and portrait mode, with a smooth transition between orientations.
When orientation changes, the image needs to be rotated to preserve the center of the image (like Photos app and hyperoslo/Lightbox)
The component should only take the minimum necessary space. In most use cases, such component should have other subviews both above and below.
Circularity. I would like the carousel to wrap around.
What I tried:
Using a TabView with .tabViewStyle(PageTabViewStyle()).indexViewStyle(PageIndexViewStyle(backgroundDisplayMode: .always)) modifiers.
This didn't work: rotating the interface caused the view to get stuck between pages (it looks like it's a well known [bug]).(https://stackoverflow.com/questions/72435939/swiftui-tabview-is-not-working-properly-on-orientation-change).
Implementing a single page (that is, an image view) using an UIScrollView and an UIViewRepresentable, then collecting them into an HStack.
Unfortunately I need to use zoomScale and contentOffset properties of the UIScrollView outside of the UIViewRepresentable itself. The net result was that .init() was invoked for every image in the carousel at every rotation, causing severe stutters and an horrible rotation animation.
Implementing the whole carousel using UIKit, and an UICollectionView, whose cells were an instance of UIScrollView.
The problem is, the UIScrollView needs to recompute its constraints upon rotation but a cell is an instance of UIView, so it can't respond to rotations via viewWillTransition(to:CGSize, with: any UIViewControllerTransitionCoordinator).
In the UICollectionView itself, you can only access the visible cells (one at a time is visible), and cells are cached, so even after rotating, some occasionally are presented on screen with the same appearance as before the rotation (some do, some don't, in the same UICollectionView). Also when rotating, it looks like the UIScrollView of the visible cell is being recreated, making it impossible to preserve the image center (I use this subclass of UIScrollView for this purpose). And the UICollectionView is taking the full window size, not just the bare minimum necessary space.
Help:
With all of this in mind, what options do I realistically have? If necessary I can raise the minimum iOS version to 16.0, even though I guess it doesn't make any significative difference since SwiftUI introduced MagnifyGesture only from iOS 17.0.
Post not yet marked as solved
This is to see if anyone knows how to resolve this incident in the new version of XCODE 15.3 since it works fine in version 15.1
As you can see, when you open the component, the text type appears by default and the added library does not load nunitosan, when change to customs and search the font, it does not appear in the list.
I would greatly appreciate any TIP or solution for this error in updating the tool.
Post marked as Apple Recommended
How can I open the user's Health Privacy Settings directly from my app when I'd like them to review them?
I believe similar questions have been asked before like this one: https://forums.developer.apple.com/forums/thread/730434
However, I'm wondering if the situation is changed for iOS 17 or if there's a way that works for Health permissions.
This is directly possible in the Garmin Connect app for example which is a major app on the store.
Please run the following UIKit app.
It displays a collection view with compositional layout (list layout) and diffable data source.
import UIKit
class ViewController: UIViewController {
var bool = false {
didSet {
var snapshot = dataSource.snapshot()
snapshot.reconfigureItems(snapshot.itemIdentifiers)
dataSource.apply(snapshot, animatingDifferences: true)
}
}
var collectionView: UICollectionView!
var dataSource: UICollectionViewDiffableDataSource<String, String>!
var snapshot: NSDiffableDataSourceSnapshot<String, String> {
var snapshot = NSDiffableDataSourceSnapshot<String, String>()
snapshot.appendSections(["section"])
snapshot.appendItems(["id"])
return snapshot
}
override func viewDidLoad() {
super.viewDidLoad()
configureHierarchy()
configureDataSource()
}
func configureHierarchy() {
collectionView = .init(frame: view.bounds, collectionViewLayout: createLayout())
view.addSubview(collectionView)
collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
}
func createLayout() -> UICollectionViewLayout {
let configuration = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
return UICollectionViewCompositionalLayout.list(using: configuration)
}
func configureDataSource() {
let cellRegistration = UICollectionView.CellRegistration<UICollectionViewListCell, String> { [weak self] cell, indexPath, itemIdentifier in
guard let self else { return }
let _switch = UISwitch()
cell.accessories = [
.customView(configuration: .init(
customView: _switch,
placement: .trailing())
),
// .disclosureIndicator()
]
_switch.isOn = bool
_switch.addTarget(self, action: #selector(toggleBool), for: .valueChanged)
}
dataSource = .init(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
collectionView.dequeueConfiguredReusableCell(using: cellRegistration, for: indexPath, item: itemIdentifier)
}
dataSource.apply(self.snapshot, animatingDifferences: false)
}
@objc func toggleBool() {
bool.toggle()
}
}
When you tap on the switch, it lags.
If you uncomment .disclosureIndicator() and tap on the switch, it doesn't lag.
How do I make it so that the switch doesn't lag without having a disclosure indicator in the cell?
Note: while it would solve the issue, I would prefer not to declare the switch at the class level, as I don't want to declare all my controls, which could be quite a lot, at the view controller level in my real app.
Edit: declaring the switch at the configureDataSource() level also fixes it, but it would still be inconvenient to declare many switches, say of a list with n elements, at that level.
If you run the following UIKit app and tap the view controller's right bar button item, the footerText property will change.
How should I update the collection view's footer to display the updated footerText?
class ViewController: UIViewController {
var collectionView: UICollectionView!
var footerText = "Initial footer text"
var dataSource: UICollectionViewDiffableDataSource<Section, String>!
var snapshot: NSDiffableDataSourceSnapshot<Section, String> {
var snapshot = NSDiffableDataSourceSnapshot<Section, String>()
snapshot.appendSections(Section.allCases)
snapshot.appendItems(["A", "a"], toSection: .first)
return snapshot
}
enum Section: CaseIterable {
case first
}
override func viewDidLoad() {
super.viewDidLoad()
configureHierarchy()
configureDataSource()
}
func configureHierarchy() {
navigationItem.rightBarButtonItem = .init(title: "Change footer text", style: .plain, target: self, action: #selector(changeFooterText))
collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: createLayout())
view.addSubview(collectionView)
collectionView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
}
@objc func changeFooterText() {
footerText = "Secondary footer text"
}
func configureDataSource() {
let cellRegistration = UICollectionView.CellRegistration<UICollectionViewListCell, String> { cell, indexPath, itemIdentifier in
var contentConfiguration = UIListContentConfiguration.cell()
contentConfiguration.text = itemIdentifier
cell.contentConfiguration = contentConfiguration
}
dataSource = .init(collectionView: collectionView) { collectionView, indexPath, itemIdentifier in
collectionView.dequeueConfiguredReusableCell(using: cellRegistration, for: indexPath, item: itemIdentifier)
}
configureSupplementaryViewProvider()
dataSource.apply(self.snapshot)
}
func configureSupplementaryViewProvider() {
let headerRegistration = UICollectionView.SupplementaryRegistration<UICollectionViewListCell>(elementKind: UICollectionView.elementKindSectionHeader) { headerView, elementKind, indexPath in
var contentConfiguration = UIListContentConfiguration.cell()
contentConfiguration.text = "Header \(indexPath.section)"
headerView.contentConfiguration = contentConfiguration
}
let footerRegistration = UICollectionView.SupplementaryRegistration<UICollectionViewListCell>(elementKind: UICollectionView.elementKindSectionFooter) { [weak self] headerView, elementKind, indexPath in
guard let self else { return }
var contentConfiguration = UIListContentConfiguration.cell()
contentConfiguration.text = self.footerText
headerView.contentConfiguration = contentConfiguration
}
dataSource.supplementaryViewProvider = { collectionView, kind, indexPath in
if kind == UICollectionView.elementKindSectionHeader {
collectionView.dequeueConfiguredReusableSupplementary(using: headerRegistration, for: indexPath)
} else if kind == UICollectionView.elementKindSectionFooter {
collectionView.dequeueConfiguredReusableSupplementary(using: footerRegistration, for: indexPath)
} else {
nil
}
}
}
func createLayout() -> UICollectionViewLayout {
UICollectionViewCompositionalLayout { section, layoutEnvironment in
var config = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
config.headerMode = .supplementary
config.footerMode = .supplementary
return NSCollectionLayoutSection.list(using: config, layoutEnvironment: layoutEnvironment)
}
}
}
What I've tried to do in footerText's didSet:
Reconfiguring the supplementary view provider:
var footerText = "Initial footer text" {
didSet {
configureSupplementaryViewProvider()
}
}
Also re-applying the snapshot:
var footerText = "Initial footer text" {
didSet {
configureSupplementaryViewProvider()
dataSource.apply(self.snapshot)
}
}
Also re-configuring the items:
var footerText = "Initial footer text" {
didSet {
configureSupplementaryViewProvider()
dataSource.apply(self.snapshot, animatingDifferences: true)
var snapshot = dataSource.snapshot()
snapshot.reconfigureItems(snapshot.itemIdentifiers)
dataSource.apply(snapshot, animatingDifferences: false)
}
}
Post not yet marked as solved
We use CollectionView with UICollectionViewLayout. On willDisplay we send all cells to back, and move to front supplementaryView. It works well, until iOS 17. But now both of these methods doesn't work. Does anybody know why? And any other way to resolve this problem.
Post not yet marked as solved
I have an application that needs to make a USSD call, but on some devices the * and # don't work on the dialer, on others it does.
if let phoneNumber = ussdNumberTextfield.text {
let encoded = "telprompt:\(phoneNumber)".addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
if let url = URL(string: encoded) {
if application.canOpenURL(url){
DispatchQueue.main.async {
self.application.open(url, options: [:]) { success in
}
}
}
}
}
Post not yet marked as solved
This crash happens online and cannot be tested and reproduced. I need help. Thank you very much.
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x000000018b4190d0
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: SIGNAL 5 Trace/BPT trap: 5
Terminating Process: exc handler [338]
Triggered by Thread: 7
Last Exception Backtrace:
0 CoreFoundation 0x180cd7c60 __exceptionPreprocess + 216 (NSException.m:200)
1 libobjc.A.dylib 0x198507ee4 objc_exception_throw + 56 (objc-exception.mm:565)
2 CoreAutoLayout 0x1987cb000 _AssertAutoLayoutOnAllowedThreadsOnly + 412 (NSISEngine.m:0)
3 CoreAutoLayout 0x1987cdb7c -[NSISEngine withBehaviors:performModifications:] + 32 (NSISEngine.m:1975)
4 UIKitCore 0x1831262fc -[UIView _resetLayoutEngineHostConstraints] + 80 (NSLayoutConstraint_UIKitAdditions.m:1426)
5 UIKitCore 0x1830fc0c0 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2376 (UIView.m:18416)
6 QuartzCore 0x18477c520 CA::Layer::layout_if_needed(CA::Transaction*) + 528 (CALayer.mm:10118)
7 QuartzCore 0x18476f294 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 132 (CALayer.mm:2480)
8 QuartzCore 0x184782cc8 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 464 (CAContextInternal.mm:2612)
9 QuartzCore 0x18478b79c CA::Transaction::commit() + 708 (CATransactionInternal.mm:449)
10 QuartzCore 0x1847dfe04 CA::Transaction::release_thread(void*) + 224 (CATransactionInternal.mm:651)
11 libsystem_pthread.dylib 0x1dc052d90 _pthread_tsd_cleanup + 520 (pthread_tsd.c:388)
12 libsystem_pthread.dylib 0x1dc055c08 _pthread_exit + 80 (pthread.c:1717)
13 libsystem_pthread.dylib 0x1dc05124c _pthread_wqthread_exit + 100 (pthread.c:2559)
14 libsystem_pthread.dylib 0x1dc050e88 _pthread_wqthread + 420 (pthread.c:2593)
15 libsystem_pthread.dylib 0x1dc05092c start_wqthread + 8 (:-1)
Post not yet marked as solved
Hello,
Is there any way to iterate all views and subviews in current xcode app and taget to particular properties to every UIButton.
I tried using folllowing code but it is not working.
for views in self.view.subviews {
if views == UIButton {
button.isPointerInteractionEnabled = true
} else {
}
}
Post not yet marked as solved
First of all, I decided to make my project with only UIKit.
So I deleted 'Main' storyboard, Info.plist->Storyboard name, and Main storyboard file base name->Main. And I edited SceneDelegate.
So now I can display the single viewControllers, but when I try to set 'UITabBarController' to rootViewController, It cause this error(title).
I tried to make UITabBarController in ViewController, UITabBarController in SceneDelegate and some more.
// BackgroundViewController for the rootViewController
import UIKit
class BackgroundViewController: UIViewController {
let backgroundTabBarController = UITabBarController()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
createTabBar()
}
}
extension BackgroundViewController {
private func createTabBar() {
view.backgroundColor = .white
view.addSubview(backgroundTabBarController.view)
let firstViewController = BookSearchViewController()
let secondViewController = MainViewController()
let thirdViewController = UserStatusViewController()
let lastViewController = OrderViewController()
firstViewController.tabBarItem = UITabBarItem(title: "Search", image: UIImage(systemName: "magnifyingglass.circle.fill"), selectedImage: UIImage(systemName: "magnifyingglass.circle"))
secondViewController.tabBarItem = UITabBarItem(title: "Main", image: UIImage(systemName: "house.fill"), selectedImage: UIImage(systemName: "house"))
thirdViewController.tabBarItem = UITabBarItem(title: "My", image: UIImage(systemName: "person.fill"), selectedImage: UIImage(systemName: "person"))
lastViewController.tabBarItem = UITabBarItem(title: "Order", image: UIImage(systemName: "menucard.fill"), selectedImage: UIImage(systemName: "menucard"))
backgroundTabBarController.viewControllers = [firstViewController, secondViewController, thirdViewController, lastViewController]
backgroundTabBarController.selectedViewController = secondViewController
}
}
// SceneDelegate
import UIKit
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScene = (scene as? UIWindowScene) else { return }
window = UIWindow(windowScene: windowScene)
window?.rootViewController = BackgroundViewController()
window?.makeKeyAndVisible()
}
}
// Error code
Thread 1: "Could not find a storyboard named 'Main' in bundle NSBundle </Users/[MyDesktopName]/Library/Developer/CoreSimulator/Devices/[ApplicationName]/data/Containers/Bundle/Application/[ApplicationName]/BTY.app> (loaded)"
But anyone of this solve the problem.
How can I make UITabBarController to rootViewController?
Make UITabBarController in SceneDelegate
Make new UIViewController that have UITabBarController and set to rootViewController
Set ViewControllers with 'UINavigationController(rootViewController:)'
Present UITabBarController from other viewController
Post not yet marked as solved
First of all, I decided to make my project with only UIKit.
So I deleted 'Main' storyboard, Info.plist->Storyboard name, and Main storyboard file base name->Main.
And I edited SceneDelegate.
So now I can display the single viewControllers, but when I try to set 'UITabBarController' to rootViewController, It cause this error(title).
I tried to make UITabBarController in ViewController, UITabBarController in SceneDelegate and some more.
How can I fix this? We can't use code-based UITabBarController in new version of Xcode now?
The documentation says the default value is false, yet when tested on two devices (iPhone 7 15.8; iPhone XS 17.4) the value is always true unless explicitly set to false. Is the documentation incorrect?
Post not yet marked as solved
I'm using something similar to this example.
import SwiftUI
struct ContentView: View {
@State private var toggle = false
var body: some View {
CustomParentView {
Button {
toggle.toggle()
} label: {
Text(toggle.description)
}
}
}
}
struct CustomParentView<Content: View>: UIViewRepresentable {
let content: Content
@inlinable init(@ViewBuilder content: () -> Content) {
self.content = content()
}
func makeUIView(context: Context) -> UIView {
let view = UIView()
let hostingController = context.coordinator.hostingController
hostingController.view.frame = view.bounds
hostingController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(hostingController.view)
return view
}
func updateUIView(_ uiView: UIView, context: Context) {
context.coordinator.hostingController.rootView = self.content
}
class Coordinator: NSObject {
var hostingController: UIHostingController<Content>
init(hostingController: UIHostingController<Content>) {
self.hostingController = hostingController
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(hostingController: UIHostingController(rootView: content))
}
}
The only different thing is I'm using UIScrollView.
When I have a @State width and call .frame(width) on the content, the content would stay with initial width even when width is changed.
I tried:
hostingController.sizingOptions = .intrinsicContentSize
This time the size would change to correct size if I pinch zoom the content, but the initial size that trigger updateUIView would be .zero. This prevents me to center the content.
Is there a way to dynamically set size and get correct rendering just like any child view of a normal SwiftUI view?
Post not yet marked as solved
The standard Command-A keyboard shortcut in a UITextView is broken in Mac Catalyst 16/ Ventura with either TextKit 2 or TextKit 1 for long texts.
In iOS 16 the selection is instant but on MacOS with Catalyst a beachball is displayed for more than 50 seconds and the app consumes gigabytes of memory.
Earlier versions of Mac Catalyst work fine.
To duplicate this just create a small storyBoard app with an editable UITextView and paste a long document around 1Mb then use the standard Select All Command either from the keyboard or the app menu.
l I use Tale of Two Cities which is about 800k to test in my app.
Is there any workaround for this?
Post not yet marked as solved
It's been a really long time since I've tried this, so I'm not sure if something has changed or if I've stumbled onto a bug...
I'm trying to implement a custom Transition Animation for a UINavigationController. While documentation around this is pretty sparse this days, I was able to take the old sample from the View Controller Programming Guide:, rewriting it in Swift:
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let containerView = transitionContext.containerView
guard let fromVC = transitionContext.viewController(forKey: .from),
let toVC = transitionContext.viewController(forKey: .to),
let toView = transitionContext.view(forKey: .to),
let fromView = transitionContext.view(forKey: .from) else {
transitionContext.completeTransition(false)
return
}
let containerFrame = containerView.frame
var toViewStartFrame = transitionContext.initialFrame(for: toVC)
let toViewFinalFrame = transitionContext.finalFrame(for: toVC)
var fromViewFinalFrame = transitionContext.finalFrame(for: fromVC)
let fromViewStartFrame = transitionContext.initialFrame(for: fromVC)
if operation.isPresenting {
toViewStartFrame.origin.x = containerFrame.size.width
toViewStartFrame.origin.y = containerFrame.size.height
} else {
fromViewFinalFrame = CGRect(x: containerFrame.size.width,
y: containerFrame.size.height,
width: toView.frame.size.width,
height: toView.frame.size.height)
// missing from Apple's sample code
toViewStartFrame = toViewFinalFrame
}
containerView.addSubview(toView)
toView.frame = toViewStartFrame
// Add the from view to the container view on dismissal, this is missing from Apple's sample code
if !operation.isPresenting {
containerView.addSubview(fromView)
fromView.frame = fromViewStartFrame
}
UIView.animate(withDuration: transitionDuration(using: transitionContext)) {
if self.operation.isPresenting {
toView.frame = toViewFinalFrame
} else {
fromView.frame = fromViewFinalFrame
}
} completion: { completed in
let success = !transitionContext.transitionWasCancelled
if (self.operation.isPresenting && !success) || (!self.operation.isPresenting && success) {
toView.removeFromSuperview()
}
// missing from Apple's sample code
if !self.operation.isPresenting {
fromView.removeFromSuperview()
}
transitionContext.completeTransition(success)
}
}
I added a couple of things to support dismissals and pops.
In order to use it with in my app, I set the navigation controller's delegate and returned the type conforming to UIViewControllerAnimatedTransitioning, containing the above code, from navigationController(_ :, animationControllerFor operation:, from fromVC:, to toVC). I've confirmed that that all behaves as you expect.
If I use this animation controller for a modal presentation or dismissal, it works fine. For a Navigation push, again, behaves as expected. But when I use it for a navigation pop I run into a problem. The animation is performed, but once it completes, the Navigation Controller's view appears to be completely empty. In a sample app, the screen goes black. In the View Debugger, I see that the UIViewControllerWrapperView has no subviews. Another curious thing I found is that my View Controller never gets a viewWillDisappear message sent.
Is there an additional setup step that I missed in order to get this working properly?
Post not yet marked as solved
0
I want to get notification like UIApplication.didBecomeActiveNotification and UIApplication.willResignActiveNotification when app switches in iPad Stage Controller Mode, but UIApplication.didBecomeActiveNotification, UIApplication.willResignActiveNotification just dont work, is there any method to get this notification
Post not yet marked as solved
I am trying to sync up the selected tab bar item once a user presses back and navigates back in the web wrapper iOS app.
Here is how the app works: When a user logs in, they are presented with the Home Screen. To navigate, the select a tab item on the tab bar. This tells webkit to redirect to that URL and then that webpage is shown in the app (wrapped). A back button also appears. When a user presses the back button, the webView.goBack() method sends the user back on in the webView.backForwardList. What happens then is that the user is now on the previous page, however the tab bar has not updated. In other words, the user is back on the first tab but the second tab is highlighted.
I tried fixing this by telling the tab bar controller what item to select, however this creates a state malfunction because it also tells the webView to navigate to that url again, so in fact this means that the user isn't going back through web history, but actually is going forward while simulating going back.
I need to be able to highlight the tab bar items that sync up with the page that we have gone back to without selecting it. Does anyone have an idea for how to manually highlight or select a tab bar item without actually navigating to that tab bar item?
Thank you!
Post not yet marked as solved
I'm working with PDFKit and trying to rotate PDFAnnotation from a PDFView:
Here is my code for a normal case(no rotated):
class ImageAnnotation: PDFAnnotation {
var image: UIImage?
init(image: UIImage?, bounds: CGRect) {
self.image = image
super.init(bounds: bounds, forType: .stamp, withProperties: nil)
}
override func draw(with box: PDFDisplayBox, in context: CGContext) {
guard let cgImage = self.image?.cgImage else { return }
context.draw(cgImage, in: bound)
}
}
And here is the way I used to rotate PDFAnnotation:
init(image: UIImage?, bounds: CGRect) {
self.image = image
super.init(bounds: bounds.applying(CGAffineTransform(rotationAngle: -CGFloat.pi/12)), forType: .stamp, withProperties: nil)
}
override func draw(with box: PDFDisplayBox, in context: CGContext) {
guard let cgImage = self.image?.cgImage else { return }
context.rotate(by: CGFloat.pi/12)
context.draw(cgImage, in: bounds)
}
But it doesn't work as expected. Can you help me? Thank you.
clemens68.
