We do not yet have a function in SkeletonRenderer that let's you check if a point is inside a bounding box. However, doing that manually is pretty simple:
SkeletonAnimation* skel = ...
spSkeleton* skel->getSkeleton();
spSkeletonBounds* bounds = spSkeletonBounds_create();
spSkeletonBounds_update(bounds, skeleton, true);
spBoundingBoxAttachment* hitBounds = spSkeletonBounds_containsPoint(bounds, x, y); // the coordinates are given in the skeleton's/node's local coordinate system
if (hitBounds) {
... do something ...
}
spSkeletonBounds_dispose(bounds); // dispose the bounds when you no longer need them.