Passing String through Segue

Question

I'm trying to pass a NSMutableString through a segue. The mutableString is a title from an MKPolygon. I've done the mutableString like this: self.titleString = [[NSMutableString alloc] initWithString:polygon.title];

I'm not sure how to segue the String: I've got this now:

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

    if([[segue identifier] isEqualToString:@"PickerViewController"])
    {
        NSLog(@"delegated");

        //Get the new view controller using [segue destinationViewController].
        PickerViewController *vc =[segue destinationViewController];
        vc.titleString = titleString;
    }
}

I get an error with vc.titleString = titleString;. Not sure how to set the String in the PickerViewController segue. Error: Property 'titleString' not found on object of type 'PickerViewController *'

The PerformSegueWithIdentifier is this Method:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    //this would be the yes button or cancel
    if (buttonIndex == 0 ){

        NSLog(@"ButtonIndex Okay");
    }
    if (buttonIndex == 1) {

        [self performSegueWithIdentifier:@"PickerViewController" sender:self];
    }
}

I do know how to segue an object, but with Strings I don't get my mind to it. Help would be really appreciated!

---

Update 1:

• I've imported the PickerViewController.h in the ViewController.h file.
• I've changed the vc.titleString = titleString; with vc.titleString = self.titleString;
• I've added a @property (strong,nonatomic) NSMutableString *titleString; to the PickerViewController.h

No luck.

---

Update 2:

• Tried an other way to segue the String: [(PickerViewController *)[segue destinationViewController] setTitleString:self.titleString];

Got the error: No visible @interface for 'PickerViewController' declares the selector 'setTitleString:'

ViewController.h file:

@property (strong, nonatomic) NSMutableString *titleString;

ViewController.m file:

@synthesize titleString; self.titleString = [[NSMutableString alloc]init];

PickerViewController.h file:

@property (strong, nonatomic) NSMutableString *titleString;

PickerViewController.m file:

@synthesize titleString; self.titleString = [[NSMutableString alloc]init];

Still seems like it doesn't recognises the titleString.

---

Update 3:

Still no luck with segueing the string.

Maybe it has something to with this:

The NSMutableString is being used in a loop. The loop checks if there is an GPS, annotation or a touch is inside a MKPolygon. Each polygon has it's own color, which is named in the polygon.title: See code below*. So the String saves the 'selected' polygon title. See the loop below:

One of the Polygons:

    CLLocationCoordinate2D roodPoly[2];
    roodPoly[0] = CLLocationCoordinate2DMake(52.372445351278294, 4.876454472541809);
    roodPoly[1] = CLLocationCoordinate2DMake(52.37288748990477, 4.878369569778442);

    MKPolygon *roodpoly = [MKPolygon polygonWithCoordinates:roodPoly count:2];
    roodpoly.title = @"red";
    [myMapView addOverlay:roodpoly];

A little bit of the loop:

            if(CGPathContainsPoint(mpr , NULL, mapPointAsCGP, FALSE)){

                NSLog(@"Coordinate %f,%f is in polygon %@", tapCoord.latitude, tapCoord.longitude, polygon.title);

                self.titleString = [[NSMutableString alloc] initWithString:polygon.title];
                self.subtitleString = [[NSMutableString alloc] initWithString:polygon.subtitle];

                alertView = [[UIAlertView alloc]initWithTitle:@"Found it" message:subtitleString delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Stel notificatie in", nil];
                [alertView show];

                NSLog(@"The color of the Polygram is: %@", titleString);

            }

            CGPathRelease(mpr);
        }
    }
}

I thought this could cause the problem for not finding the String :(

Answer 1

On your "PickerViewController.h" should look like:

#import <UIKit/UIKit.h>

@interface PickerViewController : UIViewController

@property (strong,nonatomic) NSMutableString * titleString;

@end

And on your "ViewController.m" file:

#import "ViewController.h"
#import "PickerViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    [(PickerViewController *) [segue destinationViewController] setTitleString:self.titleString];
}
@end

It is Working fine here..

Hope it helps :)