Pin Annotation with UIAlertView - ios

Question

I created a button in a "bottom bar." When the user presses the button, I am trying to show a UIAlertView, so the user can enter an address which will result in a blue pin being shown on the map. This pin should then be saved to NSUserDefaults, so that the location is saved each time the app is restarted.
Here is what I have so far. The user can enter the address in the UIAlertView, but nothing happens...
- (IBAction)selectHq:(UIBarButtonItem *)sender
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Select Headquarters"
message:#"Enter Address"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Ok", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[[alert textFieldAtIndex:0] setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];
[alert show];
UITextField *field = [alert textFieldAtIndex:0];
field.placeholder = #"Enter HQ Address";
if (!self.geocoder)
{
self.geocoder = [[CLGeocoder alloc] init];
}
NSString *hqAddress = [NSString stringWithFormat:#"%#", field.text];
[self.geocoder geocodeAddressString:hqAddress completionHandler:^(NSArray *placemarks, NSError *error) {
if ([placemarks count] > 0)
{
CLPlacemark *placemark = [placemarks objectAtIndex:0];
CLLocation *location = placemark.location;
CLLocationCoordinate2D hqCoordinate = location.coordinate;
NSLog (#"%f %f", hqCoordinate.latitude, hqCoordinate.longitude);
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta = 0.01;
span.longitudeDelta = 0.01;
region.span = span;
region.center = hqCoordinate;
MKPointAnnotation *hqAnnotation = [[MKPointAnnotation alloc] init];
[hqAnnotation setCoordinate:hqCoordinate];
[hqAnnotation setTitle:#"HQ"];
[[self mapView] addAnnotation:hqAnnotation];
[self.mapView setRegion:region animated:TRUE];
[self.mapView regionThatFits:region];
}
}];
[[NSUserDefaults standardUserDefaults] setObject:field.text forKey:HQ_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];

Answer 1

You should implement the UIAlertViewDelegate and put your action code for alert button selection in to the delegate method.
- (IBAction)selectHq:(UIBarButtonItem *)sender
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Select Headquarters"
message:#"Enter Address"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Ok", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[[alert textFieldAtIndex:0] setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];
[alert show];
[alert release] // if non-arc project.
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
// add your code here for tagging the map
// saving to nsuserdefaults.
}