crash stack:
Crashed: com.apple.main-thread
0 libsystem_pthread.dylib 0x90c thread_chkstk_darwin + 60
1 libsystem_pthread.dylib 0x90c ___chkstk_darwin + 60
2 CoreAutoLayout 0x14c4 -[NSISEngine _flushPendingRemovals] + 56
3 CoreAutoLayout 0x2de08 -[NSISEngine _coreReplaceMarker:withMarkerPlusDelta:].cold.1 + 64
4 CoreAutoLayout 0x15d78 -[NSISEngine _coreReplaceMarker:withMarkerPlusDelta:] + 204
5 CoreAutoLayout 0x2ce38 -[NSISEngine constraintDidChangeSuchThatMarker:shouldBeReplacedByMarkerPlusDelta:] + 108
6 CoreAutoLayout 0x15f1c -[NSISEngine tryToChangeConstraintSuchThatMarker:isReplacedByMarkerPlusDelta:undoHandler:] + 100
7 CoreAutoLayout 0x2fdbc -[NSLayoutConstraint _tryToChangeContainerGeometryWithUndoHandler:] + 252
8 CoreAutoLayout 0x3020c -[NSLayoutConstraint _setSymbolicConstant:constant:symbolicConstantMultiplier:] + 452
9 CoreAutoLayout 0x30378 -[NSLayoutConstraint setConstant:] + 84
10 UIKitCore 0x51c3c __74-[UIView(UIConstraintBasedLayout) _autoresizingConstraints_frameDidChange]_block_invoke + 140
11 UIKitCore 0x1841174 -[UIView(AdditionalLayoutSupport) _withUnsatisfiableConstraintsLoggingSuspendedIfEngineDelegateExists:] + 112
12 UIKitCore 0x51b28 -[UIView(UIConstraintBasedLayout) _autoresizingConstraints_frameDidChange] + 452
13 UIKitCore 0x2c894 -[UIView _constraints_frameDidChange] + 100
14 UIKitCore 0x18fac08 -[UIView(Geometry) setFrame:] + 576
15 UIKitCore 0x96712c -[UITabBar setFrame:] + 128
16 UIKitCore 0x1666f4 -[_UITabBarControllerVisualStyle updateTabBarLayout] + 360
17 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
18 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
19 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
20 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
21 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
22 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
23 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
24 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
25 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
26 UIKitCore 0x16671c -[_UITabBarControllerVisualStyle updateTabBarLayout] + 400
27 UIKitCore 0x16642c -[UITabBarController _prepareTabBar] + 128
28 UIKitCore 0x166a10 -[UITabBarController _layoutContainerView] + 376
29 UIKitCore 0x1677a8 -[UITabBarController __viewWillLayoutSubviews] + 28
30 UIKitCore 0x147078 -[UILayoutContainerView layoutSubviews] + 176
31 UIKit 0xb14a0 -[UILayoutContainerViewAccessibility layoutSubviews] + 60
for a more detail crash stack, can see attach file:
crash.txt
crash probabilistic happed after app enter background, and our app support landscape, when crash appear, the system method:
/*
This method is called when the view controller's view's size is changed by its parent (i.e. for the root view controller when its window rotates or is resized).
If you override this method, you should either call super to propagate the change to children or manually forward the change to children.
*/
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator API_AVAILABLE(ios(8.0));
is called;
but for a normal not crash case, when enter background and rotate device, the viewWillTransitionToSize method is not called until app enter foreground;
Are there any suggestions that can help solve this problem, thank you.
Selecting any option will automatically load the page
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In our app, there is a UIWindow makeKeyAndVisible crash, and for now, it appears once, crash stack:
the crash detail:
crash.txt
in the RCWindowSceneManager class's makeWindowKeyAndVisible method, we check and set a window's windowScene and makeKeyAndVisible:
public func makeWindowKeyAndVisible(_ window: UIWindow?) {
guard let window else {
return
}
if let currentWindowScene {
if window.windowScene == nil || window.windowScene != currentWindowScene {
window.windowScene = currentWindowScene
}
window.makeKeyAndVisible()
}
}
and I set a break point at a normal no crash flow, the stack is:
why it crash? and how we avoid this, thank you.
In our project, we are now using UIScene, and when click InputText to pull up Keyboard, and when rotate the device, the Keyboard does not update:
how can we fix this issue?
our app support silent push, and we use below code to get if app is launched by silent push:
if let remoteNotification = launchOptions?[UIApplication.LaunchOptionsKey.remoteNotification] as? [AnyHashable: Any],
let aps = remoteNotification["aps"] as? [AnyHashable: Any],
let contentAvailable = aps["content-available"] as? Int,
contentAvailable == 1 {
isSilentNotification = true
}
when app is launch and call:
application(_:didFinishLaunchingWithOptions:)
but when migrate to UIScene, the launchOptions is always nil, and we can not get to know if app is launched by silent push;
I read the develop doc:
it says:
If the app supports scenes, this is nil.
Continue using UIApplicationDelegate's application(_:didReceiveRemoteNotification:fetchCompletionHandler:) to process silent remote notifications after scene connection.
but the time for method calling
application(_:didReceiveRemoteNotification:fetchCompletionHandler:)
id too late.
So except in didReceiveRemoteNotification method calling:
application(_:didReceiveRemoteNotification:fetchCompletionHandler:)
are there any other ways to obtain the silent push flag when app is launch and has not didReceiveRemoteNotification call back.
Our project using UISplitViewController as the root view controller for whole app. And when using the xocde26 to build app in iOS26, the layout of page is uncorrect.
for iPhone, when launch app and in portrait mode, the app only show a blank page:
and when rotate app to landscape, the first view controller of UISplitViewController's viewControllers will float on second view controller:
and this float behavior also happens in iPad:
below is the demo code:
AppDelegate.swift:
import UIKit
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
let window: UIWindow = UIWindow()
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let vc = SplitViewController(primary: TabBarViewController(), secondary: ViewController())
window.rootViewController = vc
window.makeKeyAndVisible()
return true
}
}
SplitViewController:
import UIKit
class SplitViewController: UISplitViewController {
init(primary: UIViewController, secondary: UIViewController) {
super.init(nibName: nil, bundle: nil)
preferredDisplayMode = .oneBesideSecondary
presentsWithGesture = false
delegate = self
viewControllers = [primary, secondary]
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
extension SplitViewController: UISplitViewControllerDelegate {
}
TabBarViewController.swift:
import UIKit
class FirstViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .red
tabBarItem = UITabBarItem(title: "Home", image: UIImage(systemName: "house"), tag: 0)
}
}
class SecondViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .purple
tabBarItem = UITabBarItem(title: "Setting", image: UIImage(systemName: "gear"), tag: 1)
}
}
class TabBarViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
let firstVC = FirstViewController()
let secondVC = SecondViewController()
tabBar.backgroundColor = .orange
viewControllers = [firstVC, secondVC]
}
}
ViewController.swift:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemPink
}
}
And I have post a feedback in Feedback Assistant(id: FB18004520), the demo project code can be found there.
when in portrait, the UINavigationBar shows normal:
when in landscape:
The top is white and blank.
In our project, we defined a CustomTabBar that inherits UITabBar, and we add some subviews and these subviews' frame is beyond UITabBar, see below picture(a beyond area button, this button is a subview of UITabBar, but frame is out of UITabBar's area):
and in order to let this button response to click action, we override the UITabBar's hitTest method, this works well below OS 26 with Xcode version below 26:
override public func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
let pointInCollectionView = self.beyondAreaButton.convert(point, from: self)
if self.beyondAreaButton.bounds.contains(pointInCollectionView) {
return self.beyondAreaButton.hitTest(pointInCollectionView, with: event)
}
return super.hitTest(point, with: event)
}
but when using Xcode26 build app on OS 26, I noticed the UITabBar is wrapped by a UIKit._UITabBarContainerView and UIKit._UITabBarContainerWrapperView, and it can not trigger the hitTest method.
since the hitTest is not triggered, so the button action is no chance to trigger too.
Any suggestions to solve this problem, thank you~
And I have file a feedback assistant: FB19252973
when using CNContactViewController to present a contact detail info, the system CNContactViewController appear some UI issues.
On iOS 26, the Poster avatar overlaps with the title "Edit device contact"
On iPadOS26 with device(not simulator), when click 'Add photo', the CNContactViewController will auto dismiss, and the console output some error log:
below are the sample code:
AppDelegate.swift:
import UIKit
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
let window: UIWindow = UIWindow()
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let vc = SplitViewController(primary: TabBarViewController(), secondary: ViewController())
window.rootViewController = vc
window.makeKeyAndVisible()
return true
}
}
SplitViewController.swift:
import UIKit
class SplitViewController: UISplitViewController {
init(primary: UIViewController, secondary: UIViewController) {
super.init(nibName: nil, bundle: nil)
preferredDisplayMode = .oneBesideSecondary
presentsWithGesture = false
delegate = self
viewControllers = [primary, secondary]
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
extension SplitViewController: UISplitViewControllerDelegate {
}
TabBarViewController.swift:
import UIKit
class BaseViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
class HomeViewController: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .red
navigationItem.title = "Home"
tabBarItem = UITabBarItem(title: "Home", image: UIImage(systemName: "house"), tag: 0)
}
}
class TabBarViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
let homeVC = HomeViewController()
let homeNav = UINavigationController(rootViewController: homeVC)
viewControllers = [homeNav]
ContactManager.shared.getAllContactIdentifiers()
}
}
ViewController.swift:
import UIKit
import Contacts
import ContactsUI
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemPink
let button = UIButton(frame: .zero)
button.backgroundColor = .orange
button.setTitle("show contact", for: .normal)
button.addTarget(self, action: #selector(showContactInfo), for: .touchUpInside)
button.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(button)
button.widthAnchor.constraint(equalToConstant: 200).isActive = true
button.heightAnchor.constraint(equalToConstant: 60).isActive = true
button.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
button.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
@objc private func showContactInfo() {
print("showContactInfo")
let identifier = ContactManager.shared.identifiers[0]
let currentContact = try? CNContactStore().unifiedContact(withIdentifier: identifier, keysToFetch: [CNContactViewController.descriptorForRequiredKeys()])
guard let contact: CNMutableContact = currentContact?.mutableCopy() as? CNMutableContact else {
return
}
let vc = CNContactViewController(forNewContact: contact)
vc.delegate = self
vc.title = "Edit Device Contact"
vc.allowsActions = false
vc.contactStore = CNContactStore()
let navigationVC: UINavigationController = UINavigationController(rootViewController: vc)
let appDelegate = UIApplication.shared.delegate as? AppDelegate
appDelegate?.window.rootViewController?.present(navigationVC, animated: true, completion: nil)
}
}
extension ViewController: CNContactViewControllerDelegate {
public func contactViewController(_ viewController: CNContactViewController, didCompleteWith contact: CNContact?) {
viewController.dismiss(animated: true, completion: nil)
}
}
When using UITabBarController and set a custom tabbar:
TabBarViewController.swift
import UIKit
class BaseViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
class HomeViewController: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .red
navigationItem.title = "Home"
tabBarItem = UITabBarItem(title: "Home", image: UIImage(systemName: "house"), tag: 0)
}
}
class PhoneViewController: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .purple
navigationItem.title = "Phone"
tabBarItem = UITabBarItem(title: "Phone", image: UIImage(systemName: "phone"), tag: 1)
}
}
class PhotoViewController: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .yellow
navigationItem.title = "Photo"
tabBarItem = UITabBarItem(title: "Photo", image: UIImage(systemName: "photo"), tag: 1)
}
}
class SettingViewController: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .green
navigationItem.title = "Setting"
tabBarItem = UITabBarItem(title: "Setting", image: UIImage(systemName: "gear"), tag: 1)
}
}
class TabBarViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
let homeVC = HomeViewController()
let homeNav = NavigationController(rootViewController: homeVC)
let phoneVC = PhoneViewController()
let phoneNav = NavigationController(rootViewController: phoneVC)
let photoVC = PhotoViewController()
let photoNav = NavigationController(rootViewController: photoVC)
let settingVC = SettingViewController()
let settingNav = NavigationController(rootViewController: settingVC)
viewControllers = [homeNav]
let dataSource = [
CustomTabBar.TabBarModel(title: "Home", icon: UIImage(systemName: "house")),
CustomTabBar.TabBarModel(title: "Phone", icon: UIImage(systemName: "phone")),
CustomTabBar.TabBarModel(title: "Photo", icon: UIImage(systemName: "photo")),
CustomTabBar.TabBarModel(title: "Setting", icon: UIImage(systemName: "gear"))
]
let customTabBar = CustomTabBar(with: dataSource)
setValue(customTabBar, forKey: "tabBar")
}
}
CustomTabBar.swift:
import UIKit
class CustomTabBar: UITabBar {
class TabBarModel {
let title: String
let icon: UIImage?
init(title: String, icon: UIImage?) {
self.title = title
self.icon = icon
}
}
class TabBarItemView: UIView {
lazy var titleLabel: UILabel = {
let titleLabel = UILabel()
titleLabel.translatesAutoresizingMaskIntoConstraints = false
titleLabel.font = .systemFont(ofSize: 14)
titleLabel.textColor = .black
titleLabel.textAlignment = .center
return titleLabel
}()
lazy var iconView: UIImageView = {
let iconView = UIImageView()
iconView.translatesAutoresizingMaskIntoConstraints = false
iconView.contentMode = .center
return iconView
}()
private var model: TabBarModel
init(model: TabBarModel) {
self.model = model
super.init(frame: .zero)
setupSubViews()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setupSubViews() {
addSubview(iconView)
iconView.topAnchor.constraint(equalTo: topAnchor).isActive = true
iconView.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
iconView.widthAnchor.constraint(equalToConstant: 34).isActive = true
iconView.heightAnchor.constraint(equalToConstant: 34).isActive = true
iconView.image = model.icon
addSubview(titleLabel)
titleLabel.topAnchor.constraint(equalTo: iconView.bottomAnchor).isActive = true
titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
titleLabel.heightAnchor.constraint(equalToConstant: 16).isActive = true
titleLabel.text = model.title
}
}
private var dataSource: [TabBarModel]
init(with dataSource: [TabBarModel]) {
self.dataSource = dataSource
super.init(frame: .zero)
setupTabBars()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
var sizeThatFits = super.sizeThatFits(size)
let safeAreaBottomHeight: CGFloat = safeAreaInsets.bottom
sizeThatFits.height = 52 + safeAreaBottomHeight
return sizeThatFits
}
private func setupTabBars() {
backgroundColor = .orange
let multiplier = 1.0 / Double(dataSource.count)
var lastItemView: TabBarItemView?
for model in dataSource {
let tabBarItemView = TabBarItemView(model: model)
addSubview(tabBarItemView)
tabBarItemView.translatesAutoresizingMaskIntoConstraints = false
tabBarItemView.topAnchor.constraint(equalTo: topAnchor).isActive = true
tabBarItemView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
if let lastItemView = lastItemView {
tabBarItemView.leadingAnchor.constraint(equalTo: lastItemView.trailingAnchor).isActive = true
} else {
tabBarItemView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
}
tabBarItemView.widthAnchor.constraint(equalTo: widthAnchor, multiplier: multiplier).isActive = true
lastItemView = tabBarItemView
}
}
}
UIKit show both custom tabbar and system tabbar:
the Xcode version is: Version 26.0 beta 2 (17A5241o)
and the iOS version is: iOS 26 (23A5276f)
Our project using UITabBarController and set a custom tabbar using below code:
let customTabBar = CustomTabBar(with: dataSource)
setValue(customTabBar, forKey: "tabBar")
But when using Xcode 26 build app in iOS 26, the tabbar does not show:
above code works well in iOS 18:
below is the demo code:
AppDelegate.swift:
import UIKit
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
let window: UIWindow = UIWindow()
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
window.rootViewController = TabBarViewController()
window.makeKeyAndVisible()
return true
}
}
CustomTabBar.swift:
import UIKit
class CustomTabBar: UITabBar {
class TabBarModel {
let title: String
let icon: UIImage?
init(title: String, icon: UIImage?) {
self.title = title
self.icon = icon
}
}
class TabBarItemView: UIView {
lazy var titleLabel: UILabel = {
let titleLabel = UILabel()
titleLabel.translatesAutoresizingMaskIntoConstraints = false
titleLabel.font = .systemFont(ofSize: 14)
titleLabel.textColor = .black
titleLabel.textAlignment = .center
return titleLabel
}()
lazy var iconView: UIImageView = {
let iconView = UIImageView()
iconView.translatesAutoresizingMaskIntoConstraints = false
iconView.contentMode = .center
return iconView
}()
private var model: TabBarModel
init(model: TabBarModel) {
self.model = model
super.init(frame: .zero)
setupSubViews()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setupSubViews() {
addSubview(iconView)
iconView.topAnchor.constraint(equalTo: topAnchor).isActive = true
iconView.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
iconView.widthAnchor.constraint(equalToConstant: 34).isActive = true
iconView.heightAnchor.constraint(equalToConstant: 34).isActive = true
iconView.image = model.icon
addSubview(titleLabel)
titleLabel.topAnchor.constraint(equalTo: iconView.bottomAnchor).isActive = true
titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
titleLabel.heightAnchor.constraint(equalToConstant: 16).isActive = true
titleLabel.text = model.title
}
}
private var dataSource: [TabBarModel]
init(with dataSource: [TabBarModel]) {
self.dataSource = dataSource
super.init(frame: .zero)
setupTabBars()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
var sizeThatFits = super.sizeThatFits(size)
let safeAreaBottomHeight: CGFloat = safeAreaInsets.bottom
sizeThatFits.height = 52 + safeAreaBottomHeight
return sizeThatFits
}
private func setupTabBars() {
backgroundColor = .orange
let multiplier = 1.0 / Double(dataSource.count)
var lastItemView: TabBarItemView?
for model in dataSource {
let tabBarItemView = TabBarItemView(model: model)
addSubview(tabBarItemView)
tabBarItemView.translatesAutoresizingMaskIntoConstraints = false
tabBarItemView.topAnchor.constraint(equalTo: topAnchor).isActive = true
tabBarItemView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
if let lastItemView = lastItemView {
tabBarItemView.leadingAnchor.constraint(equalTo: lastItemView.trailingAnchor).isActive = true
} else {
tabBarItemView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
}
tabBarItemView.widthAnchor.constraint(equalTo: widthAnchor, multiplier: multiplier).isActive = true
lastItemView = tabBarItemView
}
}
}
TabBarViewController.swift:
import UIKit
class NavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
class HomeViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .red
navigationItem.title = "Home"
}
}
class PhoneViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .purple
navigationItem.title = "Phone"
}
}
class PhotoViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .yellow
navigationItem.title = "Photo"
}
}
class SettingViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .green
navigationItem.title = "Setting"
}
}
class TabBarViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
let homeVC = HomeViewController()
let homeNav = NavigationController(rootViewController: homeVC)
let phoneVC = PhoneViewController()
let phoneNav = NavigationController(rootViewController: phoneVC)
let photoVC = PhotoViewController()
let photoNav = NavigationController(rootViewController: photoVC)
let settingVC = SettingViewController()
let settingNav = NavigationController(rootViewController: settingVC)
viewControllers = [homeNav, phoneNav, photoNav, settingNav]
let dataSource = [
CustomTabBar.TabBarModel(title: "Home", icon: UIImage(systemName: "house")),
CustomTabBar.TabBarModel(title: "Phone", icon: UIImage(systemName: "phone")),
CustomTabBar.TabBarModel(title: "Photo", icon: UIImage(systemName: "photo")),
CustomTabBar.TabBarModel(title: "Setting", icon: UIImage(systemName: "gear"))
]
let customTabBar = CustomTabBar(with: dataSource)
setValue(customTabBar, forKey: "tabBar")
}
}
And I have post a feedback in Feedback Assistant(id: FB18141909), the demo project code can be found there.
How are we going to solve this problem? Thank you.
We using below command to run unit test and collect coverage:
xcodebuild -workspace Demo.xcworkspace -scheme VideoTests -configuration Debug -derivedDataPath ../build/derivedData -destination 'platform=iOS Simulator,id=E6630007-570B-4DEB-A023-2BCE91116A8D' -resultBundlePath './fastlane/test_output/VideoTests.xcresult' -enableCodeCoverage YES -testPlan 'Video' test-without-building | tee '/Users/rcadmin/Library/Logs/scan/VideoTests.log' | xcbeautify -q --is-ci
and using xcrun llvm-cov show command to generate coverage report:
xcrun llvm-cov show /build/unit-test/coverage/libraries/merged/video.o -instr-profile=/app/ios/build/derivedData/Build//ProfileData/E6630007-570B-4DEB-A023-2BCE91116A8D/video.profdata -show-branches count -show-expansions -show-line-counts -use-color -format=html -output-dir coverage
and the html report does not include branch coverage:
how to generate the branch coverage?
When call:
[UITabBarController setViewControllers:animated:]
It crashed and raise an Fatal Exception:
Fatal Exception: NSInternalInconsistencyException Attempting to select a view controller that isn't a child! (null)
the crash stack is:
Fatal Exception: NSInternalInconsistencyException
0 CoreFoundation 0x8408c __exceptionPreprocess
1 libobjc.A.dylib 0x172e4 objc_exception_throw
2 Foundation 0x82215c _userInfoForFileAndLine
3 UIKitCore 0x38a468 -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:]
4 UIKitCore 0x3fa8a4 -[UITabBarController _setSelectedViewController:performUpdates:]
5 UIKitCore 0x3fa710 -[UITabBarController setSelectedIndex:]
6 UIKitCore 0x8a5fc +[UIView(Animation) performWithoutAnimation:]
7 UIKitCore 0x3e54e0 -[UITabBarController _setViewControllers:animated:]
8 UIKitCore 0x45d7a0 -[UITabBarController setViewControllers:animated:]
And it appear sometimes, what's the root cause?
When using:
[[NSUserDefaults alloc] initWithSuiteName:@"TestSuiteName"];
It sometimes cause crash, the crash detail is:
Thread 4 name: com.apple.root.user-interactive-qos
Thread 4 Crashed:
0 CoreFoundation 0x1963f9b10 __CFCheckCFInfoPACSignature + 4
1 CoreFoundation 0x19643ed64 CFBundleGetInfoDictionary + 24
2 CoreFoundation 0x19643ed1c CFBundleGetIdentifier + 16
3 Foundation 0x195053740 -[NSUserDefaults(NSUserDefaults) _initWithSuiteName:container:] + 84
4 UIKitCore 0x198e26ef0 ___UIKitUserDefaults_block_invoke + 40
5 libdispatch.dylib 0x19e0ee0d0 _dispatch_client_callout + 20
6 libdispatch.dylib 0x19e0ef918 _dispatch_once_callout + 32
7 UIKitCore 0x198e9de28 _UIKitUserDefaults + 80
8 UIKitCore 0x198f58a7c ___UIKitPreferencesOnce_block_invoke + 20
9 libdispatch.dylib 0x19e0ee0d0 _dispatch_client_callout + 20
10 libdispatch.dylib 0x19e0ef918 _dispatch_once_callout + 32
11 UIKitCore 0x198f56c8c _UIKitPreferencesOnce + 80
12 UIKitCore 0x198f563b8 ___UIApplicationMainPreparations_block_invoke + 20
13 libdispatch.dylib 0x19e0ec370 _dispatch_call_block_and_release + 32
14 libdispatch.dylib 0x19e0ee0d0 _dispatch_client_callout + 20
15 libdispatch.dylib 0x19e0fff60 _dispatch_root_queue_drain + 860
16 libdispatch.dylib 0x19e100590 _dispatch_worker_thread2 + 156
17 libsystem_pthread.dylib 0x21d7dfc40 _pthread_wqthread + 228
18 libsystem_pthread.dylib 0x21d7dc488 start_wqthread + 8
and for more detail crash info can see the attachment image
.
And Refer to the API's description:
/// -initWithSuiteName: initializes an instance of NSUserDefaults that searches the shared preferences search list for the domain 'suitename'. For example, using the identifier of an application group will cause the receiver to search the preferences for that group. Passing the current application's bundle identifier, NSGlobalDomain, or the corresponding CFPreferences constants is an error. Passing nil will search the default search list.
- (nullable instancetype)initWithSuiteName:(nullable NSString *)suitename API_AVAILABLE(macos(10.9), ios(7.0), watchos(2.0), tvos(9.0)) NS_DESIGNATED_INITIALIZER;
It seems using a constants string is a wrong way.
Does any one know what to root cause?
In iOS 18, we encountered a crash:
Thread 4 name: com.apple.root.user-interactive-qos
Thread 4 Crashed:
0 CoreFoundation 0x18c4f9b10 __CFCheckCFInfoPACSignature + 4
1 CoreFoundation 0x18c53ed64 CFBundleGetInfoDictionary + 24
2 CoreFoundation 0x18c53ed1c CFBundleGetIdentifier + 16
3 Foundation 0x18b153740 -[NSUserDefaults(NSUserDefaults) _initWithSuiteName:container:] + 84
4 UIKitCore 0x18ef26ef0 ___UIKitUserDefaults_block_invoke + 40
5 libdispatch.dylib 0x1941ee0d0 _dispatch_client_callout + 20
6 libdispatch.dylib 0x1941ef918 _dispatch_once_callout + 32
7 UIKitCore 0x18ef9de28 _UIKitUserDefaults + 80
8 UIKitCore 0x18f058a7c ___UIKitPreferencesOnce_block_invoke + 20
9 libdispatch.dylib 0x1941ee0d0 _dispatch_client_callout + 20
10 libdispatch.dylib 0x1941ef918 _dispatch_once_callout + 32
11 UIKitCore 0x18f056c8c _UIKitPreferencesOnce + 80
12 UIKitCore 0x18f0563b8 ___UIApplicationMainPreparations_block_invoke + 20
13 libdispatch.dylib 0x1941ec370 _dispatch_call_block_and_release + 32
14 libdispatch.dylib 0x1941ee0d0 _dispatch_client_callout + 20
15 libdispatch.dylib 0x1941fff60 _dispatch_root_queue_drain + 860
16 libdispatch.dylib 0x194200590 _dispatch_worker_thread2 + 156
17 libsystem_pthread.dylib 0x2136ffc40 _pthread_wqthread + 228
18 libsystem_pthread.dylib 0x2136fc488 start_wqthread + 8
Below image show more details:
And after set a symbol breakpoint:
[NSUserDefaults _initWithSuiteName:container:]
We found that at the beginning of app launch, the system will call it:
It not always crash, but sometimes especially when app upgrade, what the root cause maybe?
When use Xcode15 and iOS 14 simulator to run app, it will crash, and the crash stack is:
Thread 1 Queue : com.apple.main-thread (serial)
#0 0x0000000104b074a5 in __cxx_global_var_init.4 ()
#1 0x000000014fb6ec95 in ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) ()
#2 0x000000014fb6f08a in ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) ()
#3 0x000000014fb69bb7 in ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) ()
#4 0x000000014fb67ec7 in ImageLoader::processInitializers(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) ()
#5 0x000000014fb67f68 in ImageLoader::runInitializers(ImageLoader::LinkContext const&, ImageLoader::InitializerTimingList&) ()
#6 0x000000014fb5b26b in dyld::initializeMainExecutable() ()
#7 0x000000014fb5ff56 in dyld::_main(macho_header const*, unsigned long, int, char const**, char const**, char const**, unsigned long*) ()
#8 0x000000014fb5a1c2 in start_sim ()
#9 0x000000024760e424 in dyld4::prepareSim(dyld4::RuntimeState&, char const*) ()
#10 0x000000024760cabc in dyld4::prepare(dyld4::APIs&, dyld3::MachOAnalyzer const*) ()
#11 0x000000024760c3bd in start ()
And I found two same issues:
1.https://issuetracker.google.com/issues/301372178; 2.https://github.com/realm/realm-swift/issues/8369
From these two issue, I know Xcode15 use new linker(ld_prime), and not support iOS <15;
So if we want to support iOS 14, we only have one solution that add the -Wl,-ld_classic options to the OTHER_LDFLAGS?
And for now, the crash only happened in iOS 14 simulator, but will it affect the iPhone device if we don't add the -Wl,-ld_classic options to the OTHER_LDFLAGS?