ios - Google Maps Region and Countries polygon -

this must quite simple question, unable find answer.

i wish show regions given region name,

if input newyork state, wish show newyork state 1 colour . when user zooms in, show different districts or significant places or regions other distinct colors , on.

how can achieve this?

you need a gmspolygon

for need gmspath list of coordinates make frame. can list of coordinates given region via web services google or openstreetmaps