英文:
Why is the UITabBarController default background color not shown in the iOS simulator?
问题
我试图以程序方式生成一个UITabBarController。这是我在应用程序代理中的做法：
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
func makeItem(title: String, image: String) -> UITabBarItem {
return UITabBarItem(
title: NSLocalizedString(title, comment: ""),
image: UIImage(systemName: image),
tag: 0
)
}
firstViewController = ViewController(backgroundColor: .blue)
firstViewController.tabBarItem = makeItem(title: "First", image: "books.vertical.fill")
secondViewController = ViewController(backgroundColor: .red)
secondViewController.tabBarItem = makeItem(title: "Second", image: "books.vertical.fill")
let tabBarController = UITabBarController()
tabBarController.setViewControllers([firstViewController, secondViewController], animated: true)
window = UIWindow(frame: UIScreen.main.bounds)
window?.rootViewController = tabBarController
window?.makeKeyAndVisible()
return true
}
结果是：
当我在真实设备上测试时，看起来是正常的：
我的Xcode版本是14.2，iOS模拟器版本是16.2。我的目标iOS版本是13。我重新安装了Xcode，但没有改变。这可能是什么原因？我一点头绪都没有。我还尝试了一些UITabBarController的公共存储库示例，结果与我的代码相同。默认的选项卡栏未正确显示。
英文:
I am trying to generate a UITabBarController programatically. This is how I did it in application delegate:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
func makeItem(title: String, image: String) -> UITabBarItem {
return UITabBarItem(
title: NSLocalizedString(title, comment: ""),
image: UIImage(systemName: image),
tag: 0
)
}
firstViewController = ViewController(backgroundColor: .blue)
firstViewController.tabBarItem = makeItem(title: "First", image: "books.vertical.fill")
secondViewController = ViewController(backgroundColor: .red)
secondViewController.tabBarItem = makeItem(title: "Second", image: "books.vertical.fill")
let tabBarController = UITabBarController()
tabBarController.setViewControllers([firstViewController, secondViewController], animated: true)
window = UIWindow(frame: UIScreen.main.bounds)
window?.rootViewController = tabBarController
window?.makeKeyAndVisible()
return true
}
The result is:
When I test this in real device it seems normal:
My Xcode version is 14.2, iOS Simulator 16.2. My target iOS version is 13. I reinstalled Xcode and it didn't change. What would be the reason of this? I have zero clue. I also tried some public repository example of UITabBarController and the result is same with my code. Default tabbar is not shown properly.
答案1
得分: 1
似乎这只是模拟器的错误，因为在设备上一切正常，但在模拟器上什么都不起作用。尝试更新你的Xcode，有一个更新版本，14.3.1。
英文:
Seems like this is just a simulator bug, since on device everything works fine, but nothing works on simulator. Try updating your Xcode, there's a newer version out, 14.3.1
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