iPhone加速度计方向 [英] iPhone Accelerometer direction

问题描述

我正在开发一个应用程序，其中iPhone在移动（剑）时会播放不同的声音。
我想知道iPhone何时向左，向右，向上或向下移动（剑移动）。
如何实现呢？
我正在测试加速度计并编写了此代码，但是如果向左或向右移动它会返回相同的值。我怎么知道iPhone朝哪个方向移动？

I am developing an application in which iPhone will play different sounds when moved (sword). I want to know when iPhone has moved left, right, up or down (sword movement). How can I implement this? I was testing the accelerometer and wrote this code, but it returns the same values if moved left or right. How can I know in which direction is the iPhone moved?

代码：

- (void)accelerometer:(UIAccelerometer *)accelerometer
        didAccelerate:(UIAcceleration *)acceleration
{
    double const kThreshold = 1.0;

    if (fabsf(acceleration.x) > kThreshold) {
        NSLog(@"X+");
    }
}

推荐答案

左右和右都使用加速度。x

Left and right both use acceleration.x

我不确定哪个是负x，另一个是正x。

I'm not sure which is which but one is negative x and the other is positive x.

上下左右相同。

它们都使用相同的轴（x，y或z），但一个方向为正

They all use the same axis (x, y or z) but one direction is positive change and the other is negative change.

通过使用fabsf，您可以消除运动的负面影响。

By using fabsf you are removing the negative side of the movement.

您需要...

if (acceleration.x > kThreshold) {
    NSLog(@"X+");
} else if (acceleration.x < kThreshold * -1) {
    NSLog(@"X-");
}

或其他。

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