Question

I have a simple app that will allow a user to tag a location. 2 buttons in the app 1 to clear tags and 1 to tag location.

I have working UIAlertview with UITextfield embedded. I need to take the user input from UITextfield and apply it to annotation on the map. My tag button code is below

- (void) tag
{
MapAnnotation *annotation = [[MapAnnotation alloc] initWithCoordinate:current.coordinate];

NSString *locString = [NSString stringWithFormat:@"%f, %f", current.coordinate.latitude, current.coordinate.longitude];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.timeStyle = NSDateFormatterLongStyle;
//insert UITextfield
UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Name your Location" message:nil delegate:self cancelButtonTitle:@"Continue" otherButtonTitles: nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
UITextField * alertTextField = [alert textFieldAtIndex:0];
alertTextField.keyboardType = UIKeyboardTypeDefault;
alertTextField.placeholder = @"Enter title of your tag";

[alert  show];
// I have tried numerous variations of NSString below
//NSString *pintitle = NSLog(@"%@", alertTextField.text);
annotation.title = pintitle; 
annotation.subtitle = locString;

[mapView addAnnotation:annotation];
}

i have tried several options some returning a null value and others nothing. I am beginning iOS development and just can’t get this part figured out

Answer 1

You need to catch the input of the text field when the alert is dismissed. This code assumes that your keep a reference of the new or edited annotation.

- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {
   UITextField *textField = [alertView textFieldAtIndex:0];
   self.annotationBeingEdited.subtitle = textField.text;
}