如何在可见地图矩形中选择特定类的注释
我正在尝试实现下面的方法，该方法基本上使用当前地图矩形中可见的注释填充我的数组。
- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
self.LocationSet = [self.mapView annotationsInMapRect:self.mapView.visibleMapRect];
self.LocationArray = [self.nearbyCarParksSet allObjects];
}
仅选择我想要包含在集合/数组中的某一类注释的正确方法是什么？例如，在当前地图视图中，我可能有属于“餐厅”类、“停车场”类、“加油站”类等的注释，而我只想存储属于“餐厅”类的注释。最好的方法是什么？
I am trying to implement the method below which basically populates my array with the annotations visible in the current map rect.
- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
self.LocationSet = [self.mapView annotationsInMapRect:self.mapView.visibleMapRect];
self.LocationArray = [self.nearbyCarParksSet allObjects];
}
What is the right way to select only a certain class of annotations which I want to include in the set/array? For example, in the current map view I might have annotations belonging to a "Restaurant" class, a "carpark" class, a "petrol station" class, etc., and I only want to store annotations belonging to the "Restaurant" class. What is the best approach?
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假设
locationSet具有从上述方法中的第一次调用派生的所有注释。您可以使用以下方式获取所有类型的注释：Assuming that
locationSethas all the annotation derived from the first call in the method above. You can get all annotations of type using,