ios - 未调用 locationManagerShouldDisplayHeadingCalibration
<p><p>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:</p><p></p>
<pre><code> ...
locmanager = ;
;
;
;
;
if ()
{
;
;
}
...
- (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;
}
</code></pre>
<p>我应该怎么做才能获得 compass 校准?谢谢。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>Apple 官方文档:</p>
<blockquote>
<p>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: </p>
<blockquote>
<p>The first time heading updates are ever requested</p>
<p>When Core Location observes a significant change in magnitude or inclination of the observed magnetic field</p>
</blockquote>
</blockquote>
<p>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。</p>
<p>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。</p>
<p>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。</p></p>
<p style="font-size: 20px;">关于ios - 未调用 locationManagerShouldDisplayHeadingCalibration,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/27869700/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/27869700/
</a>
</p>
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