Coding⏱️ 1 min read📅 2026-05-31

How to Fix: Simplest way to throw an error/exception with a custom message in Swift?

Throw a runtime exception with a custom message in Swift

Quick Answer: Use a custom class that conforms to the ErrorType protocol, or create a struct that conforms to the Error protocol and use it as an error type.

To throw a runtime exception with a custom message in Swift, you can create a custom class that conforms to the ErrorType protocol. However, instead of defining an enum for every type of error, you can use a generic class that takes a string parameter.

🚀 How to Create a Custom Exception Class

  • Create a new Swift file and define a generic class that takes a string parameter:
class CustomException: Error, ExpressibleByStringLiteral {    let message: String

Example Usage:

  1. Step 1: Create an instance of the custom exception class and pass a string parameter:
let customError = CustomException( 

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