iPhone 加速度计究竟测量什么? [英] What exactly does the iPhone accelerometer measure?

问题描述

苹果 UIAcceleration 类文档 说，

当设备背部平放在水平面上静止不动时，每个加速度事件大约具有以下值:
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！明明说设备静止不动"，加速度怎么可能不为零?

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

从回复来看，我认为这应该被称为测力计"或重力计"之类的东西，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 to本斯奈德:

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

加速度计测量两个加速度向量的总和:重力和用户加速度.用户加速度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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