Ada & BuLuWy生活日常

From MapKiWiki:

dirflg Route type:

• dirflg=h Switches on "Avoid Highways" route finding mode.
• dirflg=t Switches on "Avoid Tolls" route finding mode.
• dirflg=r Switches on "Public Transit" - only works in some areas.
• dirflg=w Switches to walking directions - still in beta.

So you URL:

NSString* urlString = @"http://maps.google.com/maps?saddr=London+UK&daddr=Birmingham+UK";

Becomes:

NSString* urlString = @"http://maps.google.com/maps?saddr=London+UK&daddr=Birmingham+UK&dirflg=r"

Ref：http://stackoverflow.com/questions/1056984/open-google-maps-to-bus-directions