Set label or text field to annotation title - ios

Question

Edit: Original Statement:
I have a navigation controller embedded with a mapView on one view controller and it push segues into a second view controller by the use of a callout. The User hits the info key on the callout and they segue into the second view controller where they have to fill out a form. Once they hit the back key in the second view controller navigation bar, how would I link the first two lines of the form they filled out to be the title and subtitle of the pin?
Update: I've gone mad, because I have googled and re-made my XCode project to fulfill this one objective. I don't like to leave tasks uncompleted. I am getting nil for my string and text field when I return back towards the first view controller.
first view controller.h file
#import <UIKit/UIKit.h>
#import "mapKit/Mapkit.h"
#import "thePinsViewController.h"
#interface ViewController : UIViewController <MKMapViewDelegate, MKAnnotation, thePinsViewController> {
MKMapView *mapViewing;
MKPointAnnotation *annot;
}
#property(nonatomic, retain) IBOutlet MKMapView *mapViewing;
#end
first view controller.m file
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize coordinate = _coordinate;
// This is your IBOutlet
#synthesize mapViewing;
// Initiate when the user holds the map to place a pin
- (void) addGestureRecognizerToMapView {
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(handleLongPress:)];
// User needs to press for [insert number in decimal format] seconds
lpgr.minimumPressDuration = 1.0;
[mapViewing addGestureRecognizer:lpgr];
}
// This method fires when you add a pin
- (void)handleLongPress:(UIGestureRecognizer *)gestureRecognizer
{
if (gestureRecognizer.state != UIGestureRecognizerStateBegan) {
return;
}
CGPoint touchPoint = [gestureRecognizer locationInView: mapViewing];
CLLocationCoordinate2D touchMapCoordinate = [mapViewing convertPoint:touchPoint toCoordinateFromView:mapViewing];
annot = [[MKPointAnnotation alloc] init];
annot.title = #"a";
annot.subtitle = #"SubTitle";
annot.coordinate = touchMapCoordinate;
[mapViewing addAnnotation:annot];
}
// This is your manual callout box
// with a rightDisclosureButton embedded in it
- (MKAnnotationView *)mapView:(MKMapView *)sender viewForAnnotation:(id <MKAnnotation>)annotation
{
MKAnnotationView *annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#""];
// This gives the user permission to see or not see the callout box
annotationView.canShowCallout = YES;
// This is the info button in the callout box
UIButton *rightDisclosureButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
annotationView.rightCalloutAccessoryView = rightDisclosureButton;
return annotationView;
}
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
thePinsViewController *scoobydoo = [[thePinsViewController alloc] init];
[self performSegueWithIdentifier:#"heylisten" sender:view];
scoobydoo.delegate = self;
}
- (void) didFirstFieldChange:(NSString*)newValue{
// Change your annotation title here
annot.title = newValue;
}
- (void) didSecondFieldChange:(NSString*)newValue{
// Change your annotation title here
annot.subtitle = newValue;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[mapViewing setDelegate:self];
[self addGestureRecognizerToMapView];
}
second view controller.h file
#import <UIKit/UIKit.h>
#protocol thePinsViewController <NSObject>
- (void) didFirstFieldChange:(NSString*)newValue;
- (void) didSecondFieldChange:(NSString*)newValue;
#end
#interface thePinsViewController : UIViewController
#property (nonatomic, weak) id<thePinsViewController> delegate;
#property(nonatomic, strong) IBOutlet UITextField *helloWorldTextField;
#property(nonatomic, strong) IBOutlet UITextField *helloWorldTextField2;
#property(nonatomic, strong) NSString *helloWorldString;
#end
second view controller.m file
#import "thePinsViewController.h"
#interface thePinsViewController ()
#end
#implementation thePinsViewController
#synthesize helloWorldTextField;
#synthesize helloWorldTextField2;
#synthesize helloWorldString;
- (void) firstFieldChanged{
if ( [self.delegate performSelector:#selector(didFirstFieldChange:)] ){
[self.delegate didFirstFieldChange:helloWorldTextField.text];
}
}
- (void) secondFieldChanged{
if ( [self.delegate performSelector:#selector(didSecondFieldChange:)] ){
[self.delegate didSecondFieldChange:helloWorldTextField2.text];
}
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
helloWorldString = helloWorldTextField.text;
}

Answer 1

You should add a delegate pattern to pass the info from your second view controller back to your first view controller.
PinInformationViewController.h
#protocol PinInformationViewControllerProtocol <NSObject>
- (void) didFirstFieldChange:(NSString*)newValue;
- (void) didSecondFieldChange:(NSString*)newValue;
#end
#interface PinInformationViewController : UIViewController
#property (nonatomic, weak) id<PinInformationViewControllerProtocol> delegate;
#end
PinInformationViewController.m
- (void) firstFieldChanged{
if ( [self.delegate performSelector:#selector(didFirstFieldChange:)] ){
[self.delegate didFirstFieldChange:myTextField.text];
}
}
- (void) secondFieldChanged{
if ( [self.delegate performSelector:#selector(didSecondFieldChange:)] ){
[self.delegate didSecondFieldChange:myOtherTextField.text];
}
}
FirstViewController.m
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
pinInformationViewController *scoobydoo = [[pinInformationViewController alloc]init];
scoobydoo.delegate = self;
annot.title = scoobydoo.helloWorldString;
[self performSegueWithIdentifier:#"heylisten" sender:view];
}
- (void) didFirstFieldChange:(NSString*)newValue{
// Change your annotation title here
}
- (void) didSecondFieldChange:(NSString*)newValue{
// Change your annotation subtitle here
}