RUM-4883 Tabbar Icon Default Tint Color

[mariedm]

What and why?

This PR introduces changes to the Session Replay feature to handle the default color of tab bar icons when no unselectedItemTintColor is set. This enhances the visual consistency and clarity in the session replays.

How?

This PR updates the UITabBarRecorder to handle the default color for unselected tab bar items. It introduces a logic that sets the tab bar's icon color to gray when the unselectedItemTintColor is not provided. The UITabBarRecorder now includes its own UIImageViewRecorder to handle icons properly.

Here's a SR example with unselectedTintColor not set on tab bar: Session Replay Example 1.

Notes on Image Comparison

This PR uses image comparison to identify the selected item in the tab bar. I considered different options for this:

• Image Data Comparison: accurate but too costly in terms of performance, especially if executed on the main thread
• Using srIdentifier: provides a unique string, and while cached, still not ideal for performance
• Using Image Description, idea suggested by @maciejburda: provides a sort of unique identifier with minimal overhead (though descriptions could be similar for images with similar properties (?))
• Using cgImage properties: generates a unique identifier, still theoretically possible for collisions, but highly unlikely

To make a decision between the last 2 options, I did a small benchmark on real devices. Results show that cgImage is much more efficient (24x faster on iPhone 13 mini, 12x faster on iPhone SE 2nd gen.).

Screenshots

Updated screenshots from snapshot tests.

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing changes

Custom CI job configuration (optional)

• Run unit tests for Core, RUM, Trace, Logs, CR and WVT
• Run unit tests for Session Replay
• Run integration tests
• Run smoke tests
• Run tests for tools/

[datadog-datadog-prod-us1]

Datadog Report

Branch report: RUM-4883-tabbar-icon-default-tint-color
Commit report: c955313
Test service: dd-sdk-ios

✅ 0 Failed, 254 Passed, 0 Skipped, 24.75s Total Time

[ncreated]

I considered different options for this:
...
To make a decision between the last 2 options, I did a small benchmark on real devices. Results show that cgImage is much more efficient (24x faster on iPhone 13 mini, 12x faster on iPhone SE 2nd gen.).

Excellent approach 🏅! We need more benchmark driven decisions in SR, well done 💪

[maxep]

Very nice work, I really appreciate the performance driven solution and the level of comments 👏
I have left a minor change request on releasing the UITabBar in the recorder.

[maxep]

Very nice work, I really appreciate the performance driven solution and the level of comments 👏
I have left a minor change request on releasing the UITabBar in the recorder.

[maxep]

Thanks, well done!