将MKMapview缩放到当前用户位置最近的两个MKAnnotations [英] Zoom MKMapview to closest two MKAnnotations for current user location

问题描述

将MKMapview缩放到当前用户位置最接近的两个或三个MKAnnotations的最佳方法是什么?

What is the best way to zoom an MKMapview to closest two or three MKAnnotations for current user location?

我有一个从plist加载的GPS坐标列表(精确来说是328个)，每个点都是地图上的注释.我想将视图限制在用户当前位置附近的两个最近的注释点.

I have a list of GPS coordinates (328 to be precise) loaded from a plist, every point is an annotation on the map. I'd like to limit the view to the two nearest annotation points around the user's current location.

推荐答案

大致而言，步骤将是:

1. 查找当前位置，转换为MKMapPoint
2. 使用MKMetersBetweenMapPoints迭代注释列表，以查找距当前位置的距离
3. 保存2或3个最小距离
4. 使用这三个距离中的最大距离使用MKCoordinateRegionMakeWithDistance
来创建区域
5. 将地图以当前位置为中心
6. 使用[mapView setRegion:region animated:TRUE]
缩放到该区域

1. Find current location, convert to MKMapPoint
2. Iterate your list of annotations, using MKMetersBetweenMapPoints to find distance from current location
3. Save 2 or 3 smallest distances
4. Use the largest of these three distances to make a region using MKCoordinateRegionMakeWithDistance
5. Center the map on current location
6. Zoom to the region using [mapView setRegion:region animated:TRUE]

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