如何将 mapkit 坐标从视图控制器（mapView）传递到细节控制器（mapView）

Question

我有一个具有不同经度和纬度的 json 文件，当我单击其中一个的注释时，我可以在视图控制器的 mapView 中显示它们，我可以转到详细视图，在详细视图中我有一个小地图视图,我要显示被点击的注解的坐标，

请您在此实施中帮助我，提前致谢！

感谢答案部分的任何代码！

这是我的视图控制器中地图视图的实现：

- (void)viewDidLoad
 {
 [super viewDidLoad];

 _mapView.showsUserLocation = YES;
 _mapView.delegate = self;
    [self fetchData];
}



 -(void)fetchData
{
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:BASED_URL]];
[request setHTTPMethod:@"GET"];
[request setValue:@"/json;charset=UTF-8" forHTTPHeaderField:@"Content-Type"];

NSURLResponse *response;
NSData *GETReply = [NSURLConnection sendSynchronousRequest:request 
returningResponse:&response error:nil];
NSString *theReply = [[NSString alloc] initWithBytes:[GETReply bytes] length:[GETReply 
length] encoding: NSASCIIStringEncoding];


CLLocationCoordinate2D location;                         
NSMutableArray *newAnnotations = [NSMutableArray array]; 
NSError *error;
NSArray *array = [NSJSONSerialization JSONObjectWithData:GETReply
                                                 options:0
                                                   error:&error];
if (error != nil)
{
    // handle the error 
}

for (NSDictionary *dictionary in array)
{

    location.latitude = [dictionary[@"latitude"] doubleValue];
    location.longitude = [dictionary[@"longitude"] doubleValue];

    // create the annotation
    MyAnnotation *newAnnotation;


    newAnnotation = [[MyAnnotation alloc] init];
    newAnnotation.company = dictionary[@"company"];
    newAnnotation.coordinate = location;     
    [newAnnotations addObject:newAnnotation];
}
[self.mapView addAnnotations:newAnnotations];
}

这是我将数据传递给详细视图控制器的方式：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
calloutAccessoryControlTapped:(UIControl *)control
 {


 MyAnnotation *annotation = view.annotation;

UIStoryboard *storyboard = self.navigationController.storyboard;

//the detail controller
DetailViewController *detail = [storyboard   
instantiateViewControllerWithIdentifier:@"DetailViewController"];

detail.companyData = annotation.company;
I don't know how to pass coordinate to mapView in detail view 

我的问题是如何传递坐标并将其显示在 detailview 的地图视图中

[self.navigationController pushViewController:detail animated:YES];

}

这是我的详细视图的代码：

@synthesize companyData = _companyData;
@synthesize detailMapView = _detailMapView;

- (void)viewDidLoad
{
[super viewDidLoad];

_company.text = _companyData;

不知道怎么添加到__detailMapView

} 

Answer 1

将属性添加到您的 detailView 的 .h 文件中：

@property (nonatomic, assign) CLLocationCoordinate2D coordinate;

在标注方法中，添加以下内容：

detail.coordinate = annotation.coordinate;

并在您的 detailView 的 viewDidLoad 中使用坐标属性：

    MyAnnotation *newAnnotation = [[MyAnnotation alloc] init];
    newAnnotation.coordinate = _coordinate;     
   [newAnnotations addObject:newAnnotation]
   [self.mapView addAnnotations:newAnnotations];