What are error handling patterns for WidgetKit in Swift?

When working with WidgetKit in Swift, error handling is crucial to ensure a seamless user experience. Here are some common error handling patterns for handling errors effectively:

1. Using Do-Catch Blocks

The do-catch block allows developers to catch and handle errors thrown by a function, providing a clean way to manage different error scenarios.

do {
    let entry = try fetchWidgetEntry()
    // Update UI with entry
} catch WidgetError.networkError {
    // Handle network error
} catch WidgetError.dataError {
    // Handle data error
} catch {
    // Handle any other error
}

2. Custom Error Types

Defining custom error types allows you to encapsulate errors with specific context, making it easier to manage error states within your widget.

enum WidgetError: Error {
    case networkError
    case dataError(String)
}

func fetchWidgetEntry() throws -> WidgetEntry {
    // Implementation code that might throw WidgetError
}

3. Completion Handlers

Using completion handlers allows you to handle errors asynchronously, providing a callback for success or failure scenarios.

func fetchWidgetEntry(completion: @escaping (Result) -> Void) {
    // Perform network call
    // Call completion(.success(entry)) or completion(.failure(error))
}