Fix typos and add @objc annotations

[mohemian-92817281]

Fixes two typos:

1. appearnce -> appearance
2. distence -> distance

I also took the liberty to do some code formatting using swiftlint autocorrect, update the example project and remove some dead code.

Bumped version to 1.1.0 since these are breaking changes (the typos are in the method signatures).

[Minitour]

@carol-mohemian
@gigi-mohemian

Thanks for contributing!