如何将核心数据对象从 MapView 发送到 DetailView

Question

我在 Core Data 中有一个包含所有属性的健身房列表，我使用 NSFetchRequest 获取这个健身房并将其传递给 NSArray，然后使用 For in 和这个数组，我可以将引脚放在 MapView 中，我用下一个代码来做（欢迎提出改进建议）：

-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:YES];

NSFetchRequest *reqInst = [NSFetchRequest fetchRequestWithEntityName:[KMTInstalacion entityName]];
reqInst.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:KMTInstalacionAttributes.tipoInstalacion_ES ascending:NO]];

KMTAppDelegate *appDelegate = (KMTAppDelegate *)[[UIApplication sharedApplication]delegate];
NSError *error;
NSArray *arrayInstalaciones = [appDelegate.model.context executeFetchRequest:reqInst error:&error];

NSLog(@"Las instalaciones encontradas en arrayInstalaciones son: %lu", (unsigned long)[arrayInstalaciones count]);

for (KMTInstalacion *todasInstalaciones in arrayInstalaciones) {
CLLocationCoordinate2D coordPunto1 =  CLLocationCoordinate2DMake(todasInstalaciones.coorLatitudValue, todasInstalaciones.coorLongitudValue);
MKPointAnnotation *anotacion = [[MKPointAnnotation alloc]init];
[anotacion setCoordinate:coordPunto1];
[anotacion setTitle:todasInstalaciones.nombre_ES];
[anotacion setSubtitle:todasInstalaciones.direccion_ES];
[self.mapView addAnnotation:anotacion];
}}

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
MKPinAnnotationView *pinView = [[MKPinAnnotationView   alloc]initWithAnnotation:annotation reuseIdentifier:@"curr"];

pinView.animatesDrop = NO;
pinView.pinColor = MKPinAnnotationColorRed;
pinView.canShowCallout = YES;
pinView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

return pinView;

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

    KMTMiAnotacion *anotacion = view.annotation;
    KMTDetailVC *detalle = [[KMTDetailVC allc]init];
    detalle.title = anotacion.title
    detalle.nombreInstalacionSeleccionada = anotacion.instalacion;

    [self performSegueWithIdentifier:@"deMapa" sender:self];

}

KMTMiAnotacion.h

@interface KMTMiAnotacion : NSObject <MKAnnotation>{
    NSString *title;
    NSString *subTitle;
    KMTInstalacion *instalacion;
}

@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subTitle;
@property (nonatomic, copy) KMTInstalacion *instalacion;
@end

当我点击其中一个 pinView 时，右侧的按钮会显示健身房的名称和地址。

现在我想要的是当您点击 pinView 按钮时，将您带到 DetailView 视图并发送完整的健身房对象 (KMTInstalacion) 对应您按下的 pinView，而不仅仅是标题或副标题，因为每个健身房大约有 50 个属性（照片、时间表等...）

知道怎么做吗？

Answer 1

在您的DetailViewController 的.h 文件中创建一个健身房对象的属性。同时创建一个具有相同属性的自定义注解（MKAnnotation 的子类）。

@property (nonatomic, strong) KMTInstalacion *gymObj;

设置注释时，将gymObj 分配给它的属性。 然后在你的 Map Controllers .m 文件中实现这个 MKMapView 的委托方法：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
 calloutAccessoryControlTapped:(UIControl *)control
{
   YourAnnotation *annView = view.annotation;
   detailedViewOfList *detailView = [[DetailedViewOfList alloc]init];
   detailView.gymObj = annotation.gymObj;
   // push view modally or, however you want
}

Answer 2

您可以使用下面的代码示例如何将详细信息发送到其他视图。根据您的需要，您可以将整个对象发送到其他视图...！

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
 calloutAccessoryControlTapped:(UIControl *)control
{
annotation *annView = view.annotation;
DetailedViewController *detailVC = [[DetailedViewController alloc] initWithNibName:@"DetailedViewController" bundle:nil];
detailVC.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
detailVC.address = annView.address;
detailVC.name = annView.name;
[self presentModalViewController:detailVC animated:YES];
}

希望对你有帮助..

Answer 3

首先在您的注释视图委托中制作一个按钮以进入详细视图，如下所示：

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

MKPinAnnotationView *mypin = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"current"];
mypin.pinColor = MKPinAnnotationColorPurple;
mypin.backgroundColor = [UIColor clearColor];
UIButton *goToDetail = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
mypin.rightCalloutAccessoryView = myBtn;
mypin.draggable = NO;
mypin.highlighted = YES;
mypin.animatesDrop = TRUE;
mypin.canShowCallout = YES;
return mypin;
}

现在，只要点击 annotationView 中的按钮，就使用以下委托，然后将调用以下委托，您可以轻松获取点击了哪个特定注释的按钮

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
 calloutAccessoryControlTapped:(UIControl *)control
{
annotation *annView = view.annotation;
detailedViewOfList *detailView = [[detailedViewOfList alloc]init];
detailView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
detailView.address = annView.address;
detailView.phoneNumber = annView.phonenumber;
[self presentModalViewController:detailView animated:YES];

或

[self.navigationController pushViewController:detailView animated:YES];
    }

这里的annotaion 是一个导入MKAnnotaion.h 的类，address 和phonenumber 是annotaion 类的属性，你可以做更多，而detailView 类的address 和phoneNumber 属性很强大。这样您就可以传递值。希望对您有所帮助！