By default, launch in portrait orientation.

默认情况下，在竖向启动。

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Gets the Angle, in degrees, that the portrait orientation is rotated to produce the landscape orientation.

获取旋转纵向方向以生成横向方向的角度，以度为单位。

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A common scenario is to have a landscape page in the middle of a document, whereas the other pages are in a portrait orientation.

常见的情况是在一个文档中包含横式页面，而其他页面都是纵向的。

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For example, if you want to set up a query list that determines whether the device is in landscape or portrait orientation, you can do so like this.

例如，如果你想要设置一个查询列表来决定该设备是横屏还是竖屏的，你可以这样做。

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For example, if you want to set up a query list that determines whether the device is in landscape or portrait orientation, you can do so like this.

例如，如果你想要设置一个查询列表来决定该设备是横屏还是竖屏的，你可以这样做。

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