![]() All this information will show up in the crash report in case anything goes wrong.īefore we go into more detail, let me just quickly mention a potential pitfall when trying to get activity tracing to work: if the activity messages are not showing up, check the system.log for any messages from the diagnosticd daemon, like "Signature Validation Failed" - you might be running into code signing issues. And finally, trace messages allow you to add further detail to the current activity. With breadcrumbs, you can leave a trail of meaningful events across activities leading up to a crash. We'll go into those in more detail below, but here's the gist of it: Activities allow you to trace the crashing code back to its originating event in a cross-queue and cross-process manner. For example, if the user triggers a refresh in your app, you'll know that this particular user interaction caused a subsequent crash, even if it happens on a different queue and several other code paths could have led to the crashing code as well.Īctivity tracing has three different parts to it: activities, breadcrumbs, and trace messages. The basic idea is that work done in response to user interactions or other events is grouped under an activity, no matter if the work is done synchronously or if it's dispatched to other queues or processes. ![]() ![]() ![]() This year's WWDC had an excellent session about it, but we thought it would be a good idea to give another overview here, since it is not widely known yet. At the same time, writing asynchronous code has become significantly easier with APIs like libdispatch, operation queues, and XPC.Īctivity tracing is a new technology introduced in iOS 8 and OS X 10.10 that aims to alleviate this problem. Tracking down crashes in asynchronous code is often very hard, because the stack trace is confined to the crashed thread and you're missing contextual information. ![]()
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