如何在iOS上使用Phonegap正确检测方向变化？

  • Z时代
  • 2024-01-10
  • 分类：问答

我在下面找到此定向测试代码，以查找JQTouch参考资料。这可以在移动Safari上的iOS模拟器中正常运行，但在Phonegap中无法正确处理。我的项目遇到了与杀死该测试页相同的问题。有没有办法在Phonegap中使用JavaScript来感知方向变化？

window.onorientationchange = function() {
  /*window.orientation returns a value that indicates whether iPhone is in portrait mode, landscape mode with the screen turned to the
    left, or landscape mode with the screen turned to the right. */
  var orientation = window.orientation;
  switch (orientation) {
    case 0:
      /* If in portrait mode, sets the body's class attribute to portrait. Consequently, all style definitions matching the body[class="portrait"] declaration
         in the iPhoneOrientation.css file will be selected and used to style "Handling iPhone or iPod touch Orientation Events". */
      document.body.setAttribute("class", "portrait");
      /* Add a descriptive message on "Handling iPhone or iPod touch Orientation Events"  */
      document.getElementById("currentOrientation").innerHTML = "Now in portrait orientation (Home button on the bottom).";
      break;
    case 90:
      /* If in landscape mode with the screen turned to the left, sets the body's class attribute to landscapeLeft. In this case, all style definitions matching the
         body[class="landscapeLeft"] declaration in the iPhoneOrientation.css file will be selected and used to style "Handling iPhone or iPod touch Orientation Events". */
      document.body.setAttribute("class", "landscape");
      document.getElementById("currentOrientation").innerHTML = "Now in landscape orientation and turned to the left (Home button to the right).";
      break;
    case -90:
      /* If in landscape mode with the screen turned to the right, sets the body's class attribute to landscapeRight. Here, all style definitions matching the
         body[class="landscapeRight"] declaration in the iPhoneOrientation.css file will be selected and used to style "Handling iPhone or iPod touch Orientation Events". */
      document.body.setAttribute("class", "landscape");
      document.getElementById("currentOrientation").innerHTML = "Now in landscape orientation and turned to the right (Home button to the left).";
      break;
  }
}

回答：

这是我的工作：

function doOnOrientationChange() {
    switch(window.orientation) {
      case -90: case 90:
        alert('landscape');
        break;
      default:
        alert('portrait');
        break;
    }
}
window.addEventListener('orientationchange', doOnOrientationChange);
// Initial execution if needed
doOnOrientationChange();

window.orientation已弃用，大多数浏览器均不支持。该事件与window.orientation相关联，因此可能不应该使用。orientationchange

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