I realise that you can open the google maps app ready for directions by doing something like this:
NSString* urlString = @"http://maps.google.com/maps?saddr=London+UK&daddr=Birmingham+UK";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString: urlString]];
But is there a parameter I can add to automatically switch to bus directions? Apple's developer document doesn't seem to mention anything about it:
https://developer.apple.com/library/archive/featuredarticles/iPhoneURLScheme_Reference/MapLinks/MapLinks.html
From MapKiWiki:
dirflg Route type:
So your 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";
N.B. The data supporting public transit route types are not always available. I tried the area you used in your sample (London, Birmingham) and found it was not supported.
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