iphone - Xcode中使用GPX模拟位置变化时，有没有办法控制速度？

Question

我在 Xcode 4.2 中使用以下 GPX 文件来模拟位置更改。它运行良好，但我无法控制位置变化的速度。邮票似乎不起作用。有人对此有解决方案吗？

<?xml version="1.0"?>
<gpx version="1.1" creator="Xcode"> 
    <wpt lat="37.331705" lon="-122.030237"></wpt>
    <wpt lat="37.331705" lon="-122.030337"></wpt>
    <wpt lat="37.331705" lon="-122.030437"></wpt>
    <wpt lat="37.331705" lon="-122.030537"></wpt>
</gpx>

Answer 1

Xcode 支持使用 GPX 文件模拟速度变化。

Provide one or more waypoints containing a latitude/longitude pair. If you provide one waypoint, Xcode will simulate that specific location. If you provide multiple waypoints, Xcode will simulate a route visitng each waypoint.

Optionally provide a time element for each waypoint. Xcode will interpolate movement at a rate of speed based on the time elapsed between each waypoint. If you do not provide a time element, then Xcode will use a fixed rate of speed. Waypoints must be sorted by time in ascending order.

这样写:

<wpt lat="39.96104510" lon="116.4450860">
    <time>2010-01-01T00:00:00Z</time>
</wpt>
<wpt lat="39.96090940" lon="116.4451400">
    <time>2010-01-01T00:00:05Z</time>
</wpt>
...
<wpt lat="39.96087240" lon="116.4450430">
    <time>2010-01-01T00:00:09Z</time>
</wpt>

大约-1速度

CoreLocation 对象的速度在模拟期间将始终为 -1。一个可能的解决方法是保存最后一个位置然后自己计算速度。示例代码:

CLLocationSpeed speed = location.speed;
if (speed < 0) {
    // A negative value indicates an invalid speed. Try calculate manually.
    CLLocation *lastLocation = self.lastLocation;
    NSTimeInterval time = [location.timestamp timeIntervalSinceDate:lastLocation.timestamp];

    if (time <= 0) {
        // If there are several location manager work at the same time, an outdated cache location may returns and should be ignored.
        return;
    }

    CLLocationDistance distanceFromLast = [lastLocation distanceFromLocation:location];
    if (distanceFromLast < DISTANCE_THRESHOLD
        || time < DURATION_THRESHOLD) {
        // Optional, dont calculate if two location are too close. This may avoid gets unreasonable value.
        return;
    }
    speed = distanceFromLast/time;
    self.lastLocation = location;
}