在Google Maps iPhone应用程序中创建后退按钮

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

If you are launching the map from within your application , then the easiest way is to use a UINavigationController in your app. This will build in the navigation bar with functioning back button for you.

If you are launching the Google Maps app, then you are exiting (or moving to background) your app. There is no going back from this. The user will need to exit Google Maps and return to your app manually by pushing the home button and re-selecting your app.

Answer 2

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.

Answer 3

You can take a view with navigation bar and a uiwebview. And put a back button on the navigation bar. Thanks.