Applications are expected to have a root view controller at the end of application launch

📝😃📢 Welcome to my blog post where I'm going to help you fix a common issue when launching an application: the dreaded "Applications are expected to have a root view controller at the end of application launch" error. 😱💥

🔍 First, let's understand what's causing this error. When an application is launched, it expects to have a root view controller set. The root view controller is the initial view that will be displayed to the user. If it's missing or not set properly, this error message will appear in the console. 🚀📱

🐞 From the code snippet you provided, it seems that you have already set the root view controller in your application:didFinishLaunchingWithOptions method:

self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];

🧐 However, the error still persists. So what could be the reason?

🔑 One common cause is when the connection between the delegate property of the UITabBarController and the App Delegate is not properly set in Interface Builder. Double-check if you have correctly connected them.

🚦 If the connection is correct, another possible reason for this issue is that the tabBarController property is not properly initialized or assigned. Ensure that you have instantiated and assigned a value to self.tabBarController before setting it as the root view controller.

💡 Additionally, check if any other code in your application might be interfering with the root view controller assignment. Look for any conflicting code that might override or reset the root view controller after it has been set.

🔧 To fix this issue, let's summarize the steps:

1. Check the connection between the delegate property of the UITabBarController and the App Delegate in Interface Builder.

2. Ensure that self.tabBarController is correctly initialized and assigned a value before setting it as the root view controller.

3. Look for any conflicting code that might interfere with the root view controller assignment.

📣 Now, apply these solutions and run your application again. Hopefully, the error message will be gone, and your app will launch successfully with the correct root view controller displayed.

👩‍💻👨‍💻 If you've tried all the solutions above and still facing the same issue, don't worry! Feel free to leave a comment below with your code or any additional details. I'll be happy to assist you further and help get your app running smoothly. Let's troubleshoot together! 🤝💪

🎉 Finally, if this blog post has been helpful to you, don't hesitate to share it with your fellow developers who might be facing the same problem. Sharing is caring, and let's help each other grow! 📢🤗

Keep coding and happy launching! 🚀💻