Manipulate camera pitch without leaving .followWithCourse

[bsudekum]

Platform: iOS
Mapbox SDK version: 3.4.0-rc.1

Steps to trigger behavior

1. Enter tracking mode .followWithCouse
2. Change camera pitch

Expected behavior

Tracking mode remains in .followWithCourse

Actual behavior

Tracking mode enters .none

---

I'm open to extending this beyond manipulating pitch. I can think of use cases for heading as well.

/cc @frederoni @boundsj @1ec5 @pveugen

[1ec5]

In other words, we should avoid kicking the user out of user tracking mode due to a programmatic camera change, but still kick the user out of user tracking mode in response to a user gesture. This would fix #1490 as well.

Unfortunately, without concurrent animations (#3625), animated pitch changes would still cause an undesirable stuttering effect in user tracking mode: the usual animation due to user location updates would pause while the pitch animates, similar to the effect seen in heading tracking mode: #3625 (comment). I would consider #3625 to be a blocker for this feature, because you’d never want to animate the pitch in user tracking mode due to this issue.

[1ec5]

Fixed in #7856 on the release-ios-v3.4.0 branch.

[ReSpawN]

@1ec5 Can you share a Swift 4 implementation on how to achieve this? Manipulating the camera with a button has zero effect for me.