iPhone加速度计到底测量的是什么？ [英] What exactly does the iPhone accelerometer measure?

问题描述

UIAcceleration类的苹果文档说，

当设备背面水平放置时表面，每个加速度事件大约有以下值：

x：0

y：0

z：-1

"When a device is laying still with its back on a horizontal surface, each acceleration event has approximately the following values:
x: 0
y: 0
z: -1
"

现在，我很困惑！当你清楚地说设备正在静止时，加速度如何非零？

Now, I am confused! How can the acceleration be non-zero, when you clearly say the "device is laying still"?

根据回答判断，我认为这应该被称为力计或重力计而不是加速度计！

Judging by the responses, I think this should be called something like 'forceometer' or 'gravitometer' and not accelerometer!

推荐答案

我找到了答案[在CoreMotion参考指南中，感谢 bensnider ：

I found the answer [in the CoreMotion Reference guide, thanks to bensnider:

加速度计测量两个加速度矢量的总和：重力和用户加速度。用户加速是用户赋予设备的加速度。

The accelerometer measures the sum of two acceleration vectors: gravity and user acceleration. User acceleration is the acceleration that the user imparts to the device.

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