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+ (void)navigationToMapAppFromCurrentToBranch:(BranchInfo *)info {

    NSString* urlString = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%@&daddr=%@,%@",[BranchLocatorGlobal currentLocationStringForCurrentLanguage] , info.lat, info.lon];

    NSString* urlString2 = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL* url = [[NSURL alloc]initWithString:urlString2];

    [[UIApplication sharedApplication] openURL:url];

}

关于参数：

在ios下，对于saddr可以指定为"Current%20Location"，这样可以指定Map使用本机的地址。

但是这个功能有个bug，参见：

http://www.martip.net/blog/localized-current-location-string-for-iphone-apps