Question

I am using this code to launch google map fine.

-(void)buttonPressed:(UIButton *)sender{
    NSString *urlstring=[NSString stringWithFormat:@"http://maps.google.com/?saddr=%f,%f&daddr=%f,%f",sourcelocation.latitude,sourcelocation.longitude,destinationlocation.latitude,destinationlocation.longitude];
    [[UIApplication sharedApplication]openURL:[NSURL URLWithString:urlstring]];
}

When I click on the button, the google map load. This action is in middle of my application. How can I create the back button?

Answer 1

The better way to do this is not to use openURL because it will exit your application but to use a UIWebView to view the page and push it onto a UINavigationController:

UIViewController *webViewController = [[[UIViewController alloc] init] autorelease];

UIWebView *uiWebView = [[[UIWebView alloc] initWithFrame: CGRectMake(0,0,320,480)] autorelease];

NSString *urlstring=[NSString stringWithFormat:@"http://maps.google.com/?saddr=%f,%f&daddr=%f,%f",sourcelocation.latitude,sourcelocation.longitude,destinationlocation.latitude,destinationlocation.longitude];

[uiWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]];

[webViewController.view addSubview: uiWebView];

[self.navigationController pushViewController:webViewController animated:YES];

This assumes though that you already have the view you are pushing from in a navigation controller.