Passing coords of annotation Mapkit tapped - iphone

Question

In my app, I have a set of location and their relative annotation. I have a button where cliking it, i go to a method that call a URL web service to get the google street view.
My code is:
- (NSString*)urlStreetview:(id<MKAnnotation>)annotation{
CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:annotation.coordinate.latitude longitude:annotation.coordinate.longitude];
NSLog(#"lat:%f",pinLocation.coordinate.latitude);
NSLog(#"lon:%f",pinLocation.coordinate.longitude);
NSString *lat_string = [[NSString alloc] initWithFormat:#"%f", pinLocation.coordinate.latitude];
NSString *lon_string = [[NSString alloc] initWithFormat:#"%f", pinLocation.coordinate.longitude];
NSString *url1 = [NSString stringWithFormat:#"http:myweb/streetview.php"];
NSString *url2 = [url1 stringByAppendingString: #"?lat="];
NSString *url3 = [url2 stringByAppendingString:lat_string];
NSString *url4 = [url3 stringByAppendingString:#"&lon="];
NSString *url = [url4 stringByAppendingString:lon_string];
NSLog(#"url:%#",url);
return url;
}
I wrote the previous method to have a url that is composed with the LatLong of the annotation.
I have a button called PressMe on the annotation pin. When I push it, I want to to excute the previous method, to calle the url, but I do not understand how pass the selected annotation to the streetView method.
- (IBAction)PressMe:(id)sender
{
UIViewController *webViewController = [[[UIViewController alloc] init] autorelease];
UIWebView *uiWebView = [[[UIWebView alloc] initWithFrame: CGRectMake(0,0,320,480)] autorelease];
[uiWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString: [self urlStreetview: ????]]]]; //HERE IS MY MY PROBLEM
[webViewController.view addSubview: uiWebView];
webViewController.title = #"web bar";
[self.navigationController pushViewController:webViewController animated:YES];
//[[self navigationController] pushViewController:thirdViewController animated:YES];
}
thanks in advance!

Answer 1

I am going to answer my question myself. I just resolve my problem an it work perfectly. The code allows to show a web view in order to have a steet View google service of the annotation map Kit annotation. Obviusly, as I am relatively new iphone developer,if someone wants to add/suggest/improve, he is welcome.
My button implementation:
- (IBAction)PressMe:(id)sender
{
UIViewController *webViewController = [[[UIViewController alloc] init] autorelease];
UIWebView *uiWebView = [[[UIWebView alloc] initWithFrame: CGRectMake(0,0,320,480)] autorelease];
[uiWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString: self.urlStreetview]]];
[webViewController.view addSubview: uiWebView];
webViewController.title = #"web bar";
[self.navigationController pushViewController:webViewController animated:YES];
//[[self navigationController] pushViewController:thirdViewController animated:YES];
}
With this button I call my (following) method "urlStreetview" the, with the annotation selected, composes a string in order to have a complet url with the apropriete GET php parameter. The url is the direction of my (very simple) web service that allow to call the google API street View.
- (NSString*)urlStreetview{
//there can only be one selected annotation so get the one at index 0
id<MKAnnotation> selectedAnnotation = [_mapView.selectedAnnotations objectAtIndex:0];
CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:selectedAnnotation.coordinate.latitude longitude:selectedAnnotation.coordinate.longitude];
//Now I have the annotation coordinate selected, so now I am able to compound the urladdingo to my base url:http://myurl/streetview.php, the GET part, I mean the lat lon coords:
NSString *lat_string = [[NSString alloc] initWithFormat:#"%f", pinLocation.coordinate.latitude];
NSString *lon_string = [[NSString alloc] initWithFormat:#"%f", pinLocation.coordinate.longitude];
NSString *url1 = [NSString stringWithFormat:#"http://myurl/streetview.php"];
NSString *url2 = [url1 stringByAppendingString: #"?lat="];
NSString *url3 = [url2 stringByAppendingString:lat_string];
NSString *url4 = [url3 stringByAppendingString:#"&lon="];
NSString *url = [url4 stringByAppendingString:lon_string];
NSLog(#"url:%#",url);
return url;
}
I hope It can be useful!