How to invoke iPhone Maps for Directions with Current Location as Start Address

Question

I know it\'s possible to start the iPhone maps application by calling openURL on a google maps URL with parameters saddr and daddr wit

Answer 1

You can use a preprocessor #define like:

#define SYSTEM_VERSION_LESS_THAN(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)

to understand your iOS version. Then, I can use this code to support iOS 6, too:

NSString* addr = nil;
if (SYSTEM_VERSION_LESS_THAN(@"6.0")) {
   addr = [NSString stringWithFormat:@"http://maps.google.com/maps?daddr=%1.6f,%1.6f&saddr=Posizione attuale", view.annotation.coordinate.latitude,view.annotation.coordinate.longitude];
} else {
   addr = [NSString stringWithFormat:@"http://maps.apple.com/maps?daddr=%1.6f,%1.6f&saddr=Posizione attuale", view.annotation.coordinate.latitude,view.annotation.coordinate.longitude];
}

NSURL* url = [[NSURL alloc] initWithString:[addr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[[UIApplication sharedApplication] openURL:url];