需求:司机接到乘客后要上传经纬度,总不能一秒一个的上传吧。需要把经纬度拉稀。
参考文献:
iOS开发:后台定位并上传数据到服务器
主要代码段
- (void)adjustDistanceFilter:(CLLocation *)location {
if (location.speed < self.minSpeed) {
if (fabs(self.locationManager.distanceFilter - self.minFilter) > 0.1f) {
self.locationManager.distanceFilter = self.minFilter;
}
}
else {
CGFloat lastSpeed = self.locationManager.distanceFilter / self.minInteval;
if (((fabs(lastSpeed - location.speed) / lastSpeed) > 0.1f ) || (lastSpeed < 0)) {
CGFloat newSpeed = (int)(location.speed+0.5f);
CGFloat newFilter = newSpeed*self.minInteval;
self.locationManager.distanceFilter = newFilter;
}
}
}
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