从另一个视图中的 MKMapView 中删除注释
我有两种看法。第一个是带有一些注释的 MKMapView。单击 UIButton 会将第二个视图推送到堆栈上。它有一个 UITableView ，其中包含与地图注释相对应的注释列表。那么，当您单击删除按钮时，如何调用另一个视图中的 MKMapView ，以便删除注释。我的 MKMapView 是在我的应用程序委托以及我当前的类中声明的。我正在尝试使用以下内容，但它不起作用：
RideAppDelegate *appDelegate = (RideAppDelegate *)[[UIApplication sharedApplication] delegate];
Annotation *ano;
CLLocationCoordinate2D anoPoint;
anoPoint.latitude = [[eventToDelete valueForKey:@"latitude"] doubleValue];
anoPoint.longitude = [[eventToDelete valueForKey:@"longitude"] doubleValue];
ano = [[[Annotation alloc] init] autorelease];
ano.coordinate = anoPoint;
[appDelegate.ridesMap removeAnnotation: ano];
[appDelegate release];
我一定是尝试错误地访问其他视图的 MKMapView 吗？
I have two views. The first is a MKMapView with some annotations. Clicking a UIButton pushes a second view on the stack. This has a UITableView with a list of annotations which correspond to the map annotations. So, when you click the delete button, how can I call my MKMapView which is in another view, so that I can remove the annotation. My MKMapView is declared in my app delegate, as well as my current class. I am trying to use the following, but it is not working:
RideAppDelegate *appDelegate = (RideAppDelegate *)[[UIApplication sharedApplication] delegate];
Annotation *ano;
CLLocationCoordinate2D anoPoint;
anoPoint.latitude = [[eventToDelete valueForKey:@"latitude"] doubleValue];
anoPoint.longitude = [[eventToDelete valueForKey:@"longitude"] doubleValue];
ano = [[[Annotation alloc] init] autorelease];
ano.coordinate = anoPoint;
[appDelegate.ridesMap removeAnnotation: ano];
[appDelegate release];
I must be trying to access the MKMapView of my other view incorrectly?
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self.ridesMap = [[MKMapView alloc] init]或类似方法创建和分配的吗？（为什么要释放 appDelegate？您不拥有或保留它。）
self.ridesMap = [[MKMapView alloc] init]or similar?(why release the appDelegate? You don't own or retain it.)