How do I throw and catch errors in Swift?

In Swift, error handling is done using the do-catch statement. You can define functions that can throw errors using the throws keyword. When you call a throwing function, you should handle the potential error using a do-catch block.

Here is a simple example:


    enum FileError: Error {
        case fileNotFound
        case unreadable
    }
    
    func readFile(fileName: String) throws -> String {
        // Simulating file reading
        let files = ["file1.txt": "Hello, World!"]
        
        guard let fileContent = files[fileName] else {
            throw FileError.fileNotFound
        }
        
        return fileContent
    }
    
    do {
        let content = try readFile(fileName: "file2.txt")
        print(content)
    } catch FileError.fileNotFound {
        print("File not found.")
    } catch {
        print("An unknown error occurred.")
    }

How do I throw and catch errors in Swift?

Popular Topics

Recent Languages

How do I throw and catch errors in Swift?

Related Questions

Popular Topics

Recent Languages