我有一个使用标题的简单 iOS 应用程序。但是由于精度非常差(10 到 25 度),我实现了 locationManagerShouldDisplayHeadingCalibration 函数。但是它永远不会被调用。这是我的代码:
...
locmanager = [CLLocationManager new];
[locmanager setDelegate:self];
[locmanager setDesiredAccuracy:kCLLocationAccuracyBest];
[locmanager setHeadingFilter:kCLHeadingFilterNone];
[locmanager setHeadingOrientation:CLDeviceOrientationLandscapeLeft|CLDeviceOrientationLandscapeRight];
if ([CLLocationManager locationServicesEnabled])
{
[locmanager startUpdatingLocation];
[locmanager startUpdatingHeading];
}
...
- (void)locationManagerCLLocationManager*)manager didUpdateHeadingCLHeading*)newHeading
{
// This one gets called
}
- (BOOL)locationManagerShouldDisplayHeadingCalibrationCLLocationManager *)manager
{
// This one does NOT get called
NSLog ("Here");
return YES;
}
我应该怎么做才能获得 compass 校准?谢谢。
Best Answer-推荐答案 strong>
Apple 官方文档:
Core Location may call this method in an effort to calibrate the onboard hardware used to determine heading values. Typically, Core Location calls this method at the following times:
The first time heading updates are ever requested
When Core Location observes a significant change in magnitude or inclination of the observed magnetic field
因此,如果您的校准已经很好并且不需要设置,则完全有可能。请注意,此方法永远不会在模拟器中被调用。
尝试将 MKMapView 与 MKUserTrackingMode.FollowWithHeading 一起使用,看看是否出现校准窗口。您的代理可能仍然没有被调用,因为 MKMapView 通过它自己的私有(private)位置管理器代理调用它。
您也可以尝试在设备上的“设置”->“定位服务”->“系统服务”中关闭 compass 校准。
关于ios - 未调用 locationManagerShouldDisplayHeadingCalibration,我们在Stack Overflow上找到一个类似的问题:
https://stackoverflow.com/questions/27869700/
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