ios - 对 MKPointAnnotation 执行后端操作

Question

我已经使用 MKPointAnnotation(s) 在 MKMapView 上填充了几个位置。在点击注释时，我显示了一些带有 UIActionSheet 菜单的选项。这些选项具有一些删除功能，当用户点击 UIActionSheet 上的删除选项时，这些功能会删除 map 上选定的注释。问题是我无法确定点击了哪个注释点，我似乎没有引用它。

添加注解点的代码为:

while(looping array of locations)
{
MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc] init];
annotationPoint.coordinate = {coord of my location}
annotationPoint.title = [anObject objectForKey:@"castTitle"];
annotationPoint.subtitle = [anObject objectForKey:@"storeName"];

[self.mainMapView addAnnotation:annotationPoint];
}

在点击注释时显示 UIActionSheet 的代码是:

-(MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
    if([annotation isKindOfClass:[MKUserLocation class]])
        return nil;

    static NSString* AnnotationIdentifier = @"AnnotationIdentifier";
    MKPinAnnotationView *pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier];

    pinView.animatesDrop = YES;
    pinView.canShowCallout = YES;
    pinView.pinColor = [self getAnnotationColor];

    UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    [rightButton setTitle:annotation.title forState:UIControlStateNormal];
    [rightButton addTarget:self action:@selector(showOptions:) forControlEvents:UIControlEventTouchUpInside];
    pinView.rightCalloutAccessoryView = rightButton;

    return pinView;
}

-(IBAction)showOptions:(id)sender
{
        UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:NSLocalizedString(@"", @"") delegate:self cancelButtonTitle:NSLocalizedString(@"Cancel", @"Cancel") destructiveButtonTitle:nil otherButtonTitles:NSLocalizedString(@"Delete", @"Delete"),      nil];

        [sheet showInView:[self.view window]];
}

Answer 1

您还可以创建一个继承自 MKPointAnnotation 的类，并添加一个 id 属性，然后使用您的类:

@interface MyPointAnnotation : MKPointAnnotation 

@property int pointId;

@end

然后在你的 View Controller 中使用它:

创建注释:

    MyPointAnnotation *myAnnotation = [[MyPointAnnotation alloc]init];
    myAnnotation.coordinate= someCoordinates;
    [myAnnotation setTitle:@"i am annotation with id"];
    myAnnotation.pointId = 1;
    [self.mapView addAnnotation:myAnnotation];

如果您有一个坐标数组，您可以循环并创建注释。

您甚至可以通过其 id 自定义注释 View :

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

MKPinAnnotationView *view=(MKPinAnnotationView*)[self.mapView dequeueReusableAnnotationViewWithIdentifier:@"reuseme"];
  if (!view) {
      view=[[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"reuseme"];
  }


  if (((MyPointAnnotation *)annotation).pointId == 1)
  {
      //the annotation with id 1.
  }
return view;
}