如何基于 MKAnnotation 引脚执行 segue？

Question

我有一个包含 2 个事件的地图，它们的引脚彼此非常接近。

此代码将检索两个引脚的位置：

// This query is used to get the location of all events in the parse cloud database
PFQuery *locationQuery = [PFQuery queryWithClassName:@"Event"];
[locationQuery whereKeyExists:@"EventLocation"];
[locationQuery whereKey:@"Organizator" notEqualTo:PFUser.currentUser.username];
[locationQuery findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error) {
        // All the locations are stored in the objects NSArray

        for (PFObject *gp in objects) {

            // We store all the found locations in a PFGeoPoint object and then we have to transform this PFGeoPoints in real latitude/longitude coordinates via the CLLocationCoordinate2DMake method
            self.location = [gp objectForKey:@"EventLocation"];
            CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(self.location.latitude, self.location.longitude);

            // Subclass of MKAnnotation
            AnnotationMap *AllEventsAround = [[AnnotationMap alloc]init];

            AllEventsAround.coordinate = coordinate; // We assign the coordinates got in CLLocationCoordinate2DMake to the coordinates of the AnnotationMap class
            AllEventsAround.title = [gp valueForKey:@"SportName"];
            AllEventsAround.subtitle = [NSString stringWithFormat:@"%@",[gp valueForKey:@"DateAndTime"]];

            // method call to point the annotations on the map
            [self.EventsmapMapView addAnnotation:AllEventsAround];
        }
    } else {
        // Log details of the failure
        NSLog(@"Error: %@ %@", error, [error userInfo]);
    }
}];

检索工作正常。一个例子可以是：

=> PFGeoPoint：0x2805XXXX，纬度：50.XXXXX，经度：19.XXXXX

=> PFGeoPoint：0x280XXXX，纬度：50.061XXXX，经度：19.93XXXX

当我点击一个 pin 时，它会根据此代码执行 segue：

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

    if ([[segue identifier] isEqualToString:@"toEventDetails"]){

    EventDetailsTableViewController *controller = (EventDetailsTableViewController *)segue.destinationViewController;
    controller.Pointfrommap = self.location;
  }
} 

我的问题：

self.location来自上述查询（PFQuery）的结果，因此它会保存从查询中获得的最后一个值，而不是来自一个pin tap的值

我的猜测：

我知道我可以使用这个 Delegate 方法：

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{

    //In case a pin is selected, we perform a segue to the event's detail view. On the segue, the actual event coordinates are stored in tappedCoord and send to the details view controller

    [self performSegueWithIdentifier:@"toEventDetails" sender:self];   // Use your appropriate segue identifier
}

也许我可以在此处添加一些内容以传递正确的位置。

Answer 1

你可以试试

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{

     AnnotationMap *allEventsAround = (AnnotationMap*)view.annotation;
     PFGeoPoint *loc  = [PFGeoPoint geoPointWithLatitude:allEventsAround.coordinate.latitude longitude:allEventsAround.coordinate.longitude];
    [self performSegueWithIdentifier:@"toEventDetails" sender:loc];   // Use your appropriate segue identifier
}

然后在prepareForSegue里面

controller.Pointfrommap =  (PFGeoPoint*) sender;