计算mkmapkit的可见rect中的引脚号 [英] count the pinnumber in visible rect of mkmapkit

问题描述

我已经使用MK Mapkit创建了一个Google地图视图，并且我在不同位置添加了带注释的图钉，现在我想在缩放地图视图时也计算在地图视图上可见的rect上的图钉数量?

I have created one Google map view using MK Mapkit and i have annotated pins on different locations now i want to calculate number of pins on visible rect on map view also on when i zoom the map view?

先感谢

推荐答案

MKMapView annotationsInMapRect:方法将为您提供给定地图矩形中的一组注释.

The MKMapView annotationsInMapRect: method will give you the set of annotations in a given map rect.

要获取当前可见的图像，请将其传递给地图视图的 visibleMapRect 属性.

To get the ones currently visible, pass it the map view's visibleMapRect property.

要检测放大，缩小或平移后可见的注释，请在 regionDidChangeAnimated 委托方法中调用该方法:

To detect what annotations are visible after a zoom in, zoom out, or pan, call that method in the regionDidChangeAnimated delegate method:

-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
    NSSet *annSet = [mapView annotationsInMapRect:mapView.visibleMapRect];
    NSLog(@"regionDidChangeAnimated: annSet count = %d", annSet.count);
}

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