Objective-C Testing values in a range

I have an objective-c question. I have an app that detects the rotation of the iOS device. I want to be able to have a timer started when the value is between two ranges. Basically if the rotation is between 0.1 and -0.1 then the timer will trigger.

I have tried while loops, for loops and I'm sure it is som开发者_如何学Cething simple I need to implement.

Thanks in advance for the suggestions!

-Brian

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Regarding your comment, it looks like you might have the logic reversed.

You had:

if (rotationValue >= 0.1 && rotationValue <= -0.1) {
   // doSomethingHere;
}

If you're looking for when the "rotation is between 0.1 and -0.1 then the timer will trigger", then you'd want:

if (rotationValue >= -0.1 && rotationValue <= 0.1) {
   // doSomethingHere;
}

(I switched the order around, putting the negative on the left and the positive on the right, as that seems more logical to me, but anyway).

Or you could do:

if (ABS(rotationValue) <= 0.1) {
   // doSomethingHere;
}

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Take a NSTImer

if you are entering that range (just store a bool for that) you create a new timer using

[NSTimer scheduledTimer...] and if you are existing that region you will need to invalidate your timer.