iphone - 如何从我的经纬度找出最近的用户？

Question

我有一个应用程序，其中我有一个位置坐标。(即纬度和经度)。然后我有一个 friend 列表及其(纬度和经度)。

I need to sort my friends array according to the condition that who is nearest to me comes first

.我有他们的和我的经纬度。有人能帮我实现这个吗？

Answer 1

CLLocation *myLoc = [[CLLocation alloc] initWithLatitude:42.5000 longitude:1.5000];
NSArray *arr = [NSArray arrayWithObjects:
                [[CLLocation alloc] initWithLatitude:42.5000 longitude:1.5000],
                [[CLLocation alloc] initWithLatitude:24.0000 longitude:54.0000],
                [[CLLocation alloc] initWithLatitude:33.0000 longitude:65.0000],
                [[CLLocation alloc] initWithLatitude:17.0500 longitude:-61.8000],
                [[CLLocation alloc] initWithLatitude:18.2500 longitude:-63.1667],
                [[CLLocation alloc] initWithLatitude:41.0000 longitude:20.0000],
                [[CLLocation alloc] initWithLatitude:40.0000 longitude:45.0000],
                nil
                ];

CLLocation *nearestLoc = nil;
CLLocationDistance nearestDis = DBL_MAX;
for (CLLocation *loc in arr) {
    CLLocationDistance distance = [myLoc distanceFromLocation:loc];
    if (nearestDis > distance) {
        nearestLoc = loc;
        nearestDis = distance;
    }
}