ios - 未调用 locationManagerShouldDisplayHeadingCalibration

Question

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)locationManager:(CLLocationManager*)manager didUpdateHeading:(CLHeading*)newHeading
{
     // This one gets called
}

- (BOOL)locationManagerShouldDisplayHeadingCalibration:(CLLocationManager *)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。

Answer 1

苹果官方文档:

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

因此完全有可能您的校准已经很好并且不需要设置。请注意，此方法永远不会在模拟器中调用。

尝试将 MKMapView 与 MKUserTrackingMode.FollowWithHeading 一起使用，看看是否出现校准窗口。您的委托(delegate)可能仍未被调用，因为 MKMapView 通过它自己的私有(private)位置管理器委托(delegate)调用它。

您也可以尝试在设备上的“设置”->“位置服务”->“系统服务”中关闭 compass 校准。