Question 1

Willow vs CocoaLumberjack for Swift logging?

Accepted Answer

Willow is Swift-native with closure-based performance and modern protocol design, while CocoaLumberjack is more mature with broader ecosystem support but Objective-C focused. Choose Willow for pure Swift projects valuing performance and extensibility over out-of-the-box features.

Question 2

How to log to a file with Willow?

Accepted Answer

Implement a custom LogWriter that handles file I/O, as shown in the README's FileWriter example. You'll need to manage file paths and writing logic yourself since no built-in file writer is provided.

Question 3

Can Willow log asynchronously to avoid slowing down my app?

Accepted Answer

Yes, configure the logger with .asynchronous(queue:) execution method to offload logging to a background dispatch queue. This improves main thread performance but requires careful queue management to maintain thread safety.

Question 4

How do I add custom log levels in Willow?

Accepted Answer

Extend the LogLevel type with new static vars using bitmasking, then add corresponding logging methods to Logger via extension. The README provides a step-by-step example for verbose logging.

Question 5

Is Willow thread-safe for iOS apps with multiple threads?

Accepted Answer

Yes, Willow guarantees thread-safe output by using locks or queues, preventing interleaved logs. You can share synchronization primitives between multiple loggers to maintain safety across frameworks.

Question 6

How to filter out noisy debug logs in Willow at runtime?

Accepted Answer

Use LogFilter protocols to conditionally exclude messages based on attributes or levels, or dynamically adjust log levels with setLogLevels(). However, this doesn't support custom log levels easily.

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