Question

我正在iPhone 5s上运行一个three.js phonegap项目，该项目根据罗盘标题读数旋转摄像机。所有工作都应该如此，但是在10秒后冻结罗盘读数。该应用程序继续正常工作，但不再调用函数 rotateCameraWithCompass 。此外，没有调用 compassError 。 watchHeading 方法似乎已冻结。

30毫秒的频率似乎是现实的，或者这在技术上是否超出界限

更新：我将频率降低到100毫秒，大约10秒后仍然冻结。

function rotateCameraWithCompass( heading ) {
    camera.rotation.y = -1 * Math.toRad( heading.magneticHeading );
}

function compassError( compassError ) { console.log( 'Compass error: ' + compassError.code ); }

var watchID = navigator.compass.watchHeading( rotateCameraWithCompass, compassError, { frequency: 30 } );

Answer 1

Answer posted to Google Groups:
https://groups.google.com/forum/#!topic/phonegap/OEZO1-0LMT4

Read the docs Luke!

iOS has quirks noted in the documentation:

Only one watchHeading can be in effect at one time in iOS. If a watchHeading uses a filter, calling getCurrentHeading or watchHeading uses the existing filter value to specify heading changes. Watching heading changes with a filter is more efficient than with time intervals.

http://docs.phonegap.com/en/4.0.0/cordova_plugins_pluginapis.md.html#Plugin%20APIs
http://plugins.cordova.io/#/package/org.apache.cordova.device-orientation

Bottom line: Use the filter as described by Jan

PhoneGap navigator.compass.watchHeading在iPhone上冻结。是否有最低的频率？

1 个答案: