CODEWITHSUNDEEP
iosuiviewcontroller
Cybernetic
Cybernetic

Reputation: 13354

Trying to pass data between viewcontrollers - pass annotation title to new viewcontroller

I have looked at all the other posts related to passing data between viewcontrollers but none of them are working for my problem.

I want to pass the title of the annotation someone taps in mapKit to a new viewcontroller so I can use that title in the new viewcontroller. I am using the calloutAccessoryControlTapped method to detect when someone has tapped the detailDisclosure button and then using the following code to add the title to the property in the second viewcontroller (called detailViewController):

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPad" bundle:nil];
    detailViewController *viewController = (detailViewController *)[storyboard instantiateViewControllerWithIdentifier:@"detailViewController"];

    detailViewController *detailView = [[detailViewController alloc] init];

    // THIS IS WHERE I SET THE ANNOTATION TITLE TO THE PROPERTY IN THE SECOND VIEWCONTROLLER
    detailView.titleTime = view.annotation.title; 

    NSLog(@"view.annotation.title: %@", view.annotation.title); // SHOWS THE TITLE
    NSLog(@"detailView.titleTime: %@", detailView.titleTime);   // SHOWS THE TITLE


    // HERE I PRESENT NEW VIEWCONTROLLER (HOPING THE TITLE IS PASSED)
    [self presentViewController:viewController animated:YES completion:nil];

}

In the second viewcontroller (detailViewController) I have this in the viewDidLoad method:

- (void)viewDidLoad
{
[super viewDidLoad];

// set the Title Label to the titleTime (passed from the mainViewController)
self.titleForDetail.text = self.titleTime;
NSLog(@"titleForDetail.text %@:", titleForDetail.text); // THIS IS NULL
 NSLog(@"titleForDetail.text %@:", titleTime); // THIS IS NULL
}

Why are self.titleForDetail.text and self.titleTime NULL? Why is nothing being passed from the original viewController?

Upvotes: 0

Views: 118

Answers (2)

rdelmar
rdelmar

Reputation: 104092

You have these two lines in your code:

    detailViewController *viewController = (detailViewController *)[storyboard instantiateViewControllerWithIdentifier:@"detailViewController"];
    detailViewController *detailView = [[detailViewController alloc] init];

And in the rest of the code, you sometimes use viewController, and sometimes detailView. You should only have one of those, and it should be instantiated like you do for viewController:

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPad" bundle:nil];
    detailViewController *detailView = (detailViewController *)[storyboard instantiateViewControllerWithIdentifier:@"detailViewController"];
    detailView.titleTime = view.annotation.title;
    [self presentViewController:detailView animated:YES completion:nil];
}

Upvotes: 1

user467105
user467105

Reputation:

In calloutAccessoryControlTapped, the code is setting the titleTime property on detailView but then presenting viewController (which does not have the property set).

Change the present to:

[self presentViewController:detailView animated:YES completion:nil];


It looks like you don't need the storyboard and viewController variables so you can remove them from that method.

Upvotes: 1

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