ios - 在数组中查找距用户位置最近的经度和纬度

Question

我有一个充满经度和纬度的数组。我的用户位置有两个双变量。我想根据我的阵列测试用户位置之间的距离，看看哪个位置最近。我该怎么做？

这将获得两个位置之间的距离，但很难理解 我如何针对一系列位置对其进行测试。

CLLocation *startLocation = [[CLLocation alloc] initWithLatitude:userlatitude longitude:userlongitude];
CLLocation *endLocation = [[CLLocation alloc] initWithLatitude:annotation.coordinate.latitude longitude:annotation.coordinate.longitude];
CLLocationDistance distance = [startLocation distanceFromLocation:endLocation];

Answer 1

您只需迭代数组检查距离即可。

NSArray *locations = //your array of CLLocation objects
CLLocation *currentLocation = //current device Location

CLLocation *closestLocation;
CLLocationDistance smallestDistance = DOUBLE_MAX;

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

    if (distance < smallestDistance) {
        smallestDistance = distance;
        closestLocation = location;
    }
}

在循环结束时，您将获得最小距离和最近位置。