How do I fix: Use a different data type for the static variable?

Step 1: Consider changing the type of your static variable from `Int` to a type that is known at compile time, such as `String` or an enum.Step 2: For example, you could declare it like this: `static let value = "111"` to avoid the error.

Coding⏱️ 3 min read📅 2026-06-04

How to Fix: A declaration cannot be both 'final' and 'dynamic' error in Swift 1.2

Q: How do I fix: 🔧 Proven Troubleshooting Steps Change the declaration of the static variable from final to non-final?

Step 1: Open your Xcode project and navigate to the file where you declared the static variable.Step 2: Replace the line `static let value = 111` with `let value = 111` to make it a non-final constant.Step 3: Alternatively, if you want to keep the variable as final but dynamic, consider using a diff

Swift compilation error explanation and solution.

Quick Answer: In Swift 1.2, a static constant cannot be marked as final due to its dynamic nature.

📋 Table of Contents

💡 Why You Are Getting This Error
🔧 Proven Troubleshooting Steps
💡 Conclusion

The error 'A declaration cannot be both 'final' and 'dynamic'' occurs in Swift 1.2 when trying to declare a constant or static variable as both final and dynamic at the same time. This error affects developers who are using Xcode 6.3.1 with Swift 1.2.

This error can be frustrating because it prevents developers from fully utilizing the features of their code. However, there is a solution to this problem that will allow you to use both final and dynamic declarations in your code.

💡 Why You Are Getting This Error

The primary reason for this error is due to the way Swift handles type inference. When declaring a static variable as final, Swift infers its type based on the context in which it's used. However, when trying to declare it as dynamic, Swift does not know the type of the variable at compile time because it's supposed to be dynamic.
Another reason for this error could be that you are trying to use a static variable with a dynamic type. This is also not allowed in Swift.

🔧 Proven Troubleshooting Steps

Change the declaration of the static variable from final to non-final

Step 1: Open your Xcode project and navigate to the file where you declared the static variable.
Step 2: Replace the line `static let value = 111` with `let value = 111` to make it a non-final constant.
Step 3: Alternatively, if you want to keep the variable as final but dynamic, consider using a different data type that can be inferred at compile time.

Use a different data type for the static variable

Step 1: Consider changing the type of your static variable from `Int` to a type that is known at compile time, such as `String` or an enum.
Step 2: For example, you could declare it like this: `static let value = "111"` to avoid the error.

💡 Conclusion

By following these steps, you should be able to resolve the 'A declaration cannot be both 'final' and 'dynamic'' error in Swift 1.2. Remember that using final and dynamic declarations together can lead to errors, so it's always best to use one or the other depending on your needs.

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