why does my macos swiftui app crash even if it works on iphone

If your macOS SwiftUI app crashes but works on iPhone, there could be several reasons for this discrepancy. Here are a few potential causes and solutions based on the content presented at WWDC:

1. Platform Differences: SwiftUI is designed to work across all Apple platforms, but there are still platform-specific behaviors and capabilities. Ensure that your app's UI and logic are correctly adapted for macOS. The session SwiftUI essentials discusses how SwiftUI provides idiomatic look and feel on different platforms, which might help you identify any platform-specific issues.

2. Concurrency Issues: If your app uses Swift concurrency features, there might be issues related to data races or main actor isolation. The session Migrate your app to Swift 6 covers adopting concurrency features and ensuring that your code is correctly isolated to the main actor, which is crucial for UI updates.

3. Debugging Tools: Utilize debugging tools like LLDB to inspect the crash logs and backtraces. The session Run, Break, Inspect: Explore effective debugging in LLDB provides insights into using backtraces to understand the control flow and identify the cause of crashes.

4. JSON Handling: If your app involves JSON handling, ensure that the JSON files are correctly formatted and accessible. The session on debugging in LLDB also highlights how issues with JSON files can lead to crashes, and how to use the debugger to pinpoint such issues.

By leveraging these insights and tools, you can better diagnose and resolve the issues causing your macOS app to crash. If you need more specific guidance, consider setting breakpoints and inspecting the execution flow to identify where the crash occurs.