我有一个简单的 iOS 应用程序，它使用标题。然而由于精度很差(10到25度)，我实现了locationManagerShouldDisplayHeadingCalibration函数。然而它永远不会被调用。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;
}
我应该怎么做才能校准 compass ？谢谢。
最佳答案
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，您的校准完全有可能已经很好并且不需要设置。请注意，该方法永远不会在模拟器中被调用。
尝试将 MKMapView 与 MKUserTrackingMode.FollowWithHeading 结合使用，看看是否出现校准窗口。您的委托(delegate)可能仍然不会被调用，因为 MKMapView 通过它自己的私有(private)位置管理器委托(delegate)来调用它。
您还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。
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/