CODEWITHSUNDEEP
iosmkmapviewmkannotation
Nubaslon
Nubaslon

Reputation: 751

How to count number and which annotations shown on MapView, when zooming?

I need to count number of annotations when i zooming mapView, and get array with which are shown on map, and then, i need to reload my Table and show list of only which shown on map.

How can i get number and array with annotation?

Upvotes: 10

Views: 5330

Answers (3)

Jordi Bruin
Jordi Bruin

Reputation: 1588

David's great solution in Swift 4

extension MKMapView {
    func visibleAnnotations() -> [MKAnnotation] {
        return self.annotations(in: self.visibleMapRect).map { obj -> MKAnnotation in return obj as! MKAnnotation }
    }
}

Upvotes: 4

David H.
David H.

Reputation: 2862

As for swift 2.0, I usually use this mapView extension to get all currently visible annotations as an array of MKAnnotations:

extension MKMapView {
    func visibleAnnotations() -> [MKAnnotation] {
        return self.annotationsInMapRect(self.visibleMapRect).map { obj -> MKAnnotation in return obj as! MKAnnotation }
    }
}

Upvotes: 13

Zhang
Zhang

Reputation: 11607

How about these two methods from MapKit class:

1) Get visible rectangle of map using:

@property(nonatomic, readonly) CGRect annotationVisibleRect

http://developer.apple.com/library/ios/DOCUMENTATION/MapKit/Reference/MKMapView_Class/MKMapView/MKMapView.html#//apple_ref/occ/instp/MKMapView/annotationVisibleRect

2) Then get annotation NSSet from parameter map rectangle:

- (NSSet *)annotationsInMapRect:(MKMapRect)mapRect

http://developer.apple.com/library/ios/DOCUMENTATION/MapKit/Reference/MKMapView_Class/MKMapView/MKMapView.html#//apple_ref/occ/instm/MKMapView/annotationsInMapRect:

So I would expect something like this:

-(void)getAnotationsInVisibleMapRectangle
{
    NSSet *annotationSet = [myMapView annotationsInMapRect:myMapView.annotationVisibleRect];

    // print number of annotations
    NSLog(@"Number of annotations in rect: %d", annotationSet.count);

    // this will return an array from the NSSet
    NSArray *annotationArray = [annotationSet allObjects]; 
}

Does that help?

Upvotes: 10

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