gistfile1.m

// This knows how read and set up vector tiles
MaplyVectorTiles *vecTiles = 
  [[MaplyVectorTiles alloc] initWithDatabase:filePath viewC:baseViewC];

// This knows how to page data in
MaplyQuadPagingLayer *layer = 
  [[MaplyQuadPagingLayer alloc] 
    initWithCoordSystem:[[MaplySphericalMercator alloc] initWebStandard] 
    delegate:vecTiles];

// We can use as many as 8 threads at once
layer.numSimultaneousFetches = 8;

// Add that sucker to the map and go!
[baseViewC addLayer:layer];

Can you show example how to use Vector or how must look JSON (for now I have map in ai format)