NSString *theString = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=Current Location&daddr=%f,%f",Location.latitude, Location.longitude];
theString = [theString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
NSURL *url = [[NSURL alloc] initWithString:theString];
theString = [theString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
NSURL *url = [[NSURL alloc] initWithString:theString];
[[UIApplication sharedApplication] openURL:url];
实际上,如果程序提供了 openURL,其它程序都可以通过这个来调用。
大众点评的查看路线应该就是这样实现的。