如何检查卡顿

To check for app performance issues like "卡顿" (hitches or hangs), you can use several tools and techniques discussed in various WWDC sessions:

1. Instruments in Xcode: Instruments is a powerful tool for diagnosing performance issues. You can use it to profile your app and identify bottlenecks. For example, the session Optimize SwiftUI performance with Instruments discusses how to use the SwiftUI instrument to identify long updates that may cause hitches.

2. CPU Performance Optimization: The session Optimize CPU performance with Instruments provides insights into optimizing CPU usage, which can help reduce hangs caused by inefficient code execution.

3. Debugging Techniques: Setting breakpoints effectively can help identify problematic code sections. The session Run, Break, Inspect: Explore effective debugging in LLDB covers how to use breakpoints to debug issues that might lead to performance problems.

4. Concurrency and Main Thread Management: In the session Code-along: Elevate an app with Swift concurrency, it is discussed how to offload tasks to background threads to prevent blocking the main thread, which can cause UI hitches.

By using these tools and techniques, you can effectively diagnose and address performance issues in your app to ensure a smooth user experience.