如何找到符合我条件的地图注释 [英] How to find map annotations that fit my criteria

问题描述

我有一个具有用户位置的MapView和一堆Map注释.

I have a MapView with user location, and a bunch of Map annotations.

首先，我想在地图上显示所有可能的图钉. (成功完成此操作)

At first I want to show all the possible pins on the map. (succeeded in doing that)

然后我要放大地图，以仅显示距离userLocation注释50公里以内的注释

Then I want to zoom in the map to show only the annotations that are within 50 KMs away from the userLocation annotation

我如何找到这些注释?

推荐答案

- (CLLocation*)closestLocationToLocation:(CLLocation*)currLocation
{
    CLLocationDistance minDistance;

    CLLocation *closestLocation = nil;

    for (CLLocation *location in arrayOfLocations) {
        CLLocationDistance distance = [location distanceFromLocation:currLocation];

        if (distance <= minDistance
            || closestLocation == nil) {
            minDistance = distance;
            closestLocation = location;
        }
    }

    //closestLocation is now the location from your array which is closest to the current location or nil if there are no locations in your array.

    return closestLocation;

}

我认为它可能对您很有帮助.谢谢！

I think Its May be Very Helpful to You.Thanks!!

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