在某个区域中创建随机CLLocationCoordinate

Question

我有一个MKMapRect.

我如何CLLocationCoordinate在里面创建一个随机的？

我知道有arc4random(),但我怎样才能将它用于GPS坐标？

Answer 1

#define ARC4RANDOM_MAX      0x100000000
... 

//val is a double between 0 and 1
double xOffset = ((double)arc4random() / ARC4RANDOM_MAX);
double yOffset = ((double)arc4random() / ARC4RANDOM_MAX);
MKMapPoint randomPoint;

randomPoint.x = maprect.origin.x + xOffset*maprect.size.width;
randomPoint.y = maprect.origin.y + yOffset*maprect.size.height;

CLLocationCoordinate2D randomCoordinate = MKCoordinateForMapPoint(randomPoint);