Add a flag at runtime (Xcode Instruments)

Question

I use tools to debug my selection in my iOS application and wondered if there is a way to add flags to the trace while the code is running. For example, I need a flag that adds the “user who clicked the X button” automatically as soon as the user taps on this button.

From what seems from Apple docs, you can add these flags only after the fact.

Answer 1

You can try the approach recommended here:

http://ioscodesnippet.com/post/43288248813/method-swizzling-in-objective-c

Basically, you can add tracing to a specific method, which, as you know, you want to track in advance, choosing a real implementation for your custom implementation that registers a trace instruction before calling the real implementation (in this case, you can override - [UIButton endTrackingWithTouch: withEvent:]).