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Hey again guys this is Caleb with slopes dot com and in this video we're going to look at a few pages

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from Apple's documentation for swift that explains what core motion is.

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And we're also going to dive into the sea motion manager subclass where we'll be able to see all the

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things that we get access to and it's not just the accelerometer.

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That's the coolest part.

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What you learn in this course can be applied to actually quite a few other instruments on your iPhone

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that exist.

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So go ahead and pull open a Safari window and you can either Google you know Apple documentation core

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motion or just go to developer dot apple dot com slash documentation's slash core emotion.

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It's up to you but this is where we're going to start.

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And as you can see core motion helps to process accelerometer gyroscope pedometer and environment related

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events.

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Now believe it or not it actually gives you the ability to use the Magg magnetometer as well.

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And I've seen some really cool uses for that like the Google cardboard VR headset for instance uses

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the magnet magnetometer I always want to say magnetometer but the magnetometer to sense disturbances

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in the magnetic field around the iPhone that's like you know how it uses the compass.

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So when your phone is in the Google cardboard VR headset there's actually a magnet on the side and when

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you pull that magnet down what happens is the magnet rushes by the magnetometer in the iPhone.

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It senses a disturbance and it uses that magnet input as a trigger system so you can like you know shoot

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guns in games in VR It's really really cool.

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So there's tons of uses for the magnetometer the pedometer gyroscopes accelerometer.

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I'm sure you can think of many uses for this but we're going to go ahead and look now at the CME motion

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manager subclass.

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All right.

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And it is the object for starting and managing motion services so that's what we need to know because

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that's where it begins.

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So as you can see well they updated us here they added data for the magnetometer in Iowa S5 because

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that's when an iPhone was first released with a magnetometer I believe it was the iPhone 3G S that had

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the compass.

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But anyway.

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So you use a CM motion manager object to access accelerometer data rotation rate data magnetometer rate

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data and other device motion data.

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These types of data originate with the devices accelerometers it's magnetometer and gyroscope.

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Typo there should be a space anyway.

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So as you can see there's lots of information here.

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We can get access to the accelerometer the devices gyroscope magnetometer and the device motion as well.

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And there's all kinds of data we can get.

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And guys I kid you not.

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It is so easy to actually pull out this data and do stuff with it.

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It's very cool how Apple has set it up for us to use.

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So now that we've sort of seen the documentation and now that we understand the full scope of what is

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possible we're going to go ahead and dive into receiving accelerometer updates with S.M. motion managers

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so we're going to head over to the next video and we're going to start writing out that code right now.

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So let's head over there and let's get started.