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我是 xcode 的新手,我希望有人可以帮助我编写代码,并指出如何解决我的问题。我一直在看互联网,但我真的想不通。

我怎样才能从地图视图转到详细视图,带上图钉的“ID”并将其打印在标签中。当我单击注释的箭头时,我的模拟器崩溃了。

请任何想法,如何处理它并解决它?

(基本上我想获取 pin 的 ID,并通过 JSON 将其发送到服务器,然后移动到 Detailview,但下一步)

这是我到目前为止所做的:

My Location.m(地图的视图控制器)

#import "My_Location.h"
#import "DetailViewController.h"

// ------ FUNCTION TO GET COORDINATES IN JSON FORMAT -------

- (void)retrieveData_Location
{

    NSURL * url = [NSURL URLWithString:@"............./Pharmacies.php"];
    NSData * data = [NSData dataWithContentsOfURL:url];
    NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    NSMutableArray *newAnnotations = [NSMutableArray array];

    CLLocationCoordinate2D location;

    for (NSDictionary *dictionary in array)
    {
    MKPointAnnotation *newAnnotation = [[MKPointAnnotation alloc] init];

    location.latitude = [dictionary[@"lat"] doubleValue];
    location.longitude = [dictionary[@"lon"] doubleValue];   
    newAnnotation.title = dictionary[@"name"];
    newAnnotation.coordinate = location;

    [newAnnotations addObject:newAnnotation];

    [newAnnotation release];      
}
    [self.MyLocation addAnnotations:newAnnotations];   
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id)annotation {

if([annotation isKindOfClass:[MKUserLocation class]])
    return nil; 
static NSString *identifier = @"myAnnotation";
MKPinAnnotationView * annotationView = (MKPinAnnotationView*)[self.MyLocation    dequeueReusableAnnotationViewWithIdentifier:identifier];
if (!annotationView)
{
    annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
    annotationView.pinColor = MKPinAnnotationColorPurple;
    annotationView.animatesDrop = YES;
    annotationView.canShowCallout = YES;
}else {
    annotationView.annotation = annotation;
}
    annotationView.rightCalloutAccessoryView = [UIButton   buttonWithType:UIButtonTypeDetailDisclosure];
    return annotationView;
}


- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view   calloutAccessoryControlTapped:(UIControl *)control
{
    [self performSegueWithIdentifier:@"Details" sender:view];

}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"Details"])
    {
        MKAnnotationView *annotationView = sender;
        [segue.destinationViewController setAnnotation:annotationView.annotation];
    }
}

Take_Photo 是我的 detailview 控制器。

我的故事板看起来像这样:

Mylocation View controller -> ( Segue: identifier ( Take_Photo )) -> Take_Photo view Controller

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