When debug app, it will crash when app launch, and print below info:
libbz2.1.0.dylib is a system library, and how we can resolve this problem?
Selecting any option will automatically load the page
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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?
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.