Скачать или смотреть Solving the Argument passed to call that takes no arguments Error in SwiftUI

Learn how to resolve the common SwiftUI error: "Argument passed to call that takes no arguments" when instantiating objects. This guide provides in-depth explanations and solutions for better coding practices.
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This video is based on the question https://stackoverflow.com/q/73617315/ asked by the user 'Hanyi Koh' ( https://stackoverflow.com/u/12099286/ ) and on the answer https://stackoverflow.com/a/73617444/ provided by the user 'workingdog support Ukraine' ( https://stackoverflow.com/u/11969817/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Argument passed to call that takes no arguments Error in SwiftUI

When developing applications with SwiftUI, developers can sometimes encounter a frustrating error message: "Argument passed to call that takes no arguments." This error typically occurs during object instantiation, and can hinder the smooth development of your app. In this guide, we will break down the problem, provide a comprehensive explanation, and guide you through the steps to fix it.

Understanding the Problem

In SwiftUI, you might find yourself encountering this specific error when trying to instantiate an object that requires parameters, but the instantiation is not handled correctly. Particularly, this often happens when you define a struct or class that requires several parameters in its initializer, yet you provide an incorrect call to it in your view.

A Common Scenario

Consider the following example: You have a Room model defined with various properties and a custom initializer that requires multiple parameters. If you attempt to instantiate this object without providing the necessary parameters or if the initializer is confused due to incorrect types or counts, you will likely see the troublesome error message.

How to Fix the Issue

Let’s take a closer look at how you can resolve this issue step-by-step, using the Room struct from your code as an illustrative example.

1. Review Your Model

Ensure that your model is defined correctly. Below is the original Room model with essential properties:

[[See Video to Reveal this Text or Code Snippet]]

Make sure to include all necessary parameters in your model as required by the initializer.

2. Adjust Your Instantiation in the RoomListView

When you use the Room model in your RoomListView, ensure you're passing the correct number and types of arguments. Verify that the roomList initialization looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Note that there are no special characters wrapped to the argument names; simply use the strings directly.

3. Test the Modified Code

After making these adjustments, compile and run your SwiftUI app. Check for any remaining errors and test if the RoomListView correctly displays data using the instances of the Room model.

[[See Video to Reveal this Text or Code Snippet]]

Make sure your body uses the correct terms and bindings as per your Room structure.

Conclusion

By following these structured steps, you should be able to effectively resolve the error message, "Argument passed to call that takes no arguments." Ensure that your model's initializer aligns with how you instantiate your struct in your views to prevent this and similar issues. With diligent coding practices, you'll create robust and error-free SwiftUI applications.

Remember, effective debugging often involves verifying both your model definitions and how you use them in your views. Happy coding!