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Hey hey hey everybody this is Caleb with Dev's Loeb's dot com.

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And in this awesome video we are going to request location services and I'm going to show you what is

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new in Iowa 11 forgetting the user's location.

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There are some things that have changed.

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Some things you need to know about that are really important to ensure that your app gets approved on

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the App Store.

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If you're using these skills for an app that you're going to release this one as well we're going to

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teach you best practices to make sure that you know what is new and what is up.

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So open your X called Project and let's get started requesting location services.

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So to do this we're going to need to go into Matt B.C and of course to get location we're going to need

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to import the Core Location frameworks so go ahead and type import Core Location and that looks great.

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And now what we need to do is we need to create an instance of a location manager.

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That's what we're going to use to manage locations of course see a location manager makes sense that

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it manages locations.

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So above view did load go Hedden type var location manager whip's capital M and we're going to set it

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to be equal to location manager and we're going to instantiate it from the get go.

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All right.

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Now similarly to our map view we need to also set the delegate of our location manager.

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So go ahead and type location manager delegate equals self.

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OK.

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And if you build and run this you'll notice it says cannot assign value of map b c to see a location

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manager delegate.

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The reason for that is because we have not conformed to it like we have MKM that you delegate.

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So go ahead and do that by creating another extension called extension Matthysse.

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And it's going to conform to C-L location manager delegate and give it some curly braces.

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So as soon as you do that you'll notice that the error goes away.

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This also means that there are no required methods to conform to C-L location manager delegate.

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Unlike you I table view or UI collection view there are some required methods that you conform to but

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there are none for unforeseen location manager or delegate.

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We're going to add some though so that we can actually have an app that works because you know that's

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important or whatever.

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Now it's totally important anyway.

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So in our extension we're going to use one of the given functions but we're also going to create one

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of our own.

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So we're going to go ahead and we're going to basically write a function of our own first called configure

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location services.

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And inside this function will give us some space here so we can see stuff awesome inside this function

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we're basically going to check to see is our app authorized to grab our location.

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If not it's going to go ahead and request those services.

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If it is it's just going to return.

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OK so it's a way to check to see if we are authorized to use our location.

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But you know what we need to actually create a variable that's going to keep track of our authorization

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status.

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So to do that go ahead it's actually going to be a constant.

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So go ahead and type let off though right zation status equals see Location Manager dot wups authorization.

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Okay.

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Sorry I can't type C-L location manager got authorization status.

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Option click on that you'll see this is a function from the location manager that returns C-L location

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authorization status.

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And if you pull that up in the help docs you'll notice that it is of type int 32 to number but basically

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these are constants that indicate whether the app is authorized to use location services.

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OK.

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So authorization status is there and it's going to be checking to see if authorized or not.

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So what we're going to do is we're first going to check to see if our authorization status is not determined.

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That's the name of one of the authorization statuses.

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So go ahead and type if authorization status is not determined.

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Meaning if the app doesn't know if it's approved or denied we're going to go ahead and we're going to

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call location manager.

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That request always authorization.

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This is going to request authorization so that our location is used always whether the app is open or

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not.

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OK then we're going to say else meaning if it is determined maybe it's denied maybe it's approved for

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when in use authorization we're going to go ahead and just return right because if we already are approved

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or already are denied there's no need to do anything else.

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We can just return.

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So that's how we're going to configure location services.

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All right.

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Very very cool.

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And now what we need to do is we need to call this function to run as soon as the view loads.

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So it's going to check to see if if we're good to go.

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So call it from view and load configure location services and let's go ahead and build and run it to

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see if it works.

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OK.

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Very cool.

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Where did we go.

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There it is.

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OK.

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And it looks like it's not working but check out the terminal here.

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It says the apps info dopiest must contain both and s location always and when in use usage description

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and N.S. location when in use usage description keys with string values explaining to the user how the

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app uses this data.

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Apple is huge on privacy so we've got to make sure we explain to the user exactly how we're using their

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data.

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So to do this go ahead and go to info up the list and down at the bottom if you hover over the bottom

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you see the plus and minus that pop up click on the plus and type privacy and then scroll down to find

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a location.

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And we're going to go ahead and we need to use location.

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Always use that description which I'll pull this open so you can see that location always usage description

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and do another one here.

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Click.

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Plus privacy location.

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When in use use usage description.

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And then furthermore we need another one and I actually copied it from here and that's location always

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and when in use your usage description.

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That's a mouthful.

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I'm going to copy that and paste that in here because in X code Bayda it's not yet working so you actually

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need to paste in this long name.

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It doesn't look nice and pretty like this.

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Now the thing is for all three of these we can use the same description but we need to use all three

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of them because in iOS 11 Apple has changed location services work instead of only showing when in use

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or always use or do not allow it forever it's basically been you can show one or the other or at different

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times.

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It's been a mess.

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But Apple is basically wanting their apps to be more user centric.

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The user is completely in control of how their data is used like it says.

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So when this pops up it's going to give the user three options when in use.

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Always in use or disallow instead of one or the other at different times based on the context so we're

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going to give the user the choice to decide which is kind of cool.

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So in order to do this we're going to say this app requires your location to pull photos from Flickr

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which we are using.

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We should put a period at the end of a sentence we are going to use that so go ahead and copy this.

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Paste it here and then paste it here for all three of these keys and values.

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OK we're going to just save it like that.

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And now that that's done we should be able to request authorization.

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So go ahead and build and run this one more time.

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Pull open your simulator and let's see if it requests our location suite.

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All right so it pulls it up.

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This is great and it gives us the choice only while using the app always allow or don't allow.

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I'm going to click always allow and as soon as you do that you'll notice my location pops up right there

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on the map.

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That's exactly what we wanted.

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But we're a little bit too far out here we can't really see anything that's going on on the map.

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So we need to actually write a function now that's going to zoom us in.

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OK we're going to call that center map on user location and basically what it's going to do is we're

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going to set a region that is about 1000 meters around where the user is and we're going to zoom the

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map in to show that whole region.

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OK pretty cool.

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So to do that we're going to actually write this function in M-K map view delegates and it has to do

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with the map view.

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And so let's do that let's write funk center map on user location give it some curly brackets there.

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That looks awesome.

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And now we're going to do in order to center this on the user's location is we're going to need to create

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a constant for the coordinate.

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Right.

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So on our map view there is a co-ordinate here where this pin has been dropped.

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The only issue is that sometimes the location manager might be a little bit slower or faster when the

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app opens.

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So we're actually going to safely create a constant using a guard.

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Let us make sure that there's a value of the coordinate.

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Otherwise it just returns.

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So if it doesn't work the first time it's going to just return.

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And then as soon as the map view starts updating the location we can call it a center which is pretty

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cool.

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So go ahead and type guard let it.

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And this is going to be equal to location manager and in the location manager we can get the location

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right.

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So that's where the blue dot is where it's showing up.

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And then we can get the coordinates from that.

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OK very cool.

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Now for a guard we need to put else at the end meaning if there is no value here what we're going to

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do happens inside these brackets.

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And we're just going to return.

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Meaning we're going to exit out of this function until it can be called later when there definitely

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is a value.

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OK so this is basically a guard lead.

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And this is a constant that we can use.

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So assuming there's a value assuming coordinate comes back something other than nyl we're going to create

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a coordinate region.

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So go ahead and type let coordinate region and this is going to be equal to M-K coordinate region which

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you can see right here.

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Now if I put a parentheses here you can see that a coordinate region has a center which hint hint it's

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going to be the blue dot and it has a span.

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So the center of course is going to be the coordinate as you would expect.

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And the M.K. coordinates span.

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If I press enter here and then option click you can see that this comes from map kit geometry and basically

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the span is where we're going to set how wide we want our region to be how big.

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And in order to keep track of that we're actually going to just set a constant of the radius that we

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want this region to be.

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And so what I'm going to do is actually appear at the tippy top.

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I'm going to go ahead and create a constant called region radius.

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Now bear in mind this needs to be of type double and we're going to set that to be equal to 1000 meaning

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1000 meters.

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That way we can set a region that is 1000 meters wide 1000 meters tall.

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We're basically creating a circle around our user.

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So with our region radius in place go ahead and scroll back down to M-K coordinates span and the M.K.

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coordinates span is going to basically allow us to set how far of a radius we want our map view to be.

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So go ahead.

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At the end of M-K coordinates spand type in net and you'll notice that there is.

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It's asking for a latitude Delta and a longitude Delta.

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OK.

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So let's go ahead and delete that.

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And now the latitude Delta is going to be the amount of change over the map.

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So we're going to have it basically go from one point plus a thousand k so we can just go ahead and

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type region radius OK and then we're going to do longitude delta of region radius as well.

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OK so that's cool our coordinate coordinate region is set.

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And now what we need to do is we need to basically just ask the map view to set that region type map

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view set region passen coordinate region and we want it to be animated.

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OK.

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Easy as that.

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So our co-ordinate region is now done.

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We're setting this region on our map view and this way it should be able to go ahead and zoom in nicely

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right to where the user is with about a 1000 meter radius around the user.

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So now we just need to know where to call this to center the map on the user's location.

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And that's actually going to be a part of C-L location manager delegate.

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So in order to do that we're going to call one of the built in functions called did change or wups I

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probably should call location manager and then let's type authorization did change.

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OK.

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So this function here did change authorization status is called any time the map view changes authorization.

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So with that in mind if suddenly our map view gets approved right if we approve when in use location

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services we want to center the map not the action center map on user location whenever we approve it.

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It's going to center on the user.

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And that's actually why we use the guard let when we press the authorization.

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If the map for some reason was not yet loaded it would try to zoom in and it would crash because it

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doesn't have a coordinate.

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But we use the guard left to return just in case we're being very safe programmers and that's one of

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the wonderful things about Swift is that you can do that.

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So let's build and run.

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Let's see if this actually does center properly like we want OK.

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There we go.

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Built.

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And let's take a look.

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How are we going to crash was is that it says invalid.

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Regents center.

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OK that's good.

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And the span is a thousand.

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Let's take a look why.

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Interesting.

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We have an M-K coordinate region and the span is good.

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OK let's you know what let's I think I know what's wrong.

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OK.

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M.K. coordinate region.

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There's another one called with make with distance.

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Yes.

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OK this is exactly right.

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Sorry guys I should have shown you this from the get go.

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M-K coordinate region make with distance allows you to use a distance length instead of a circular region.

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That's what I'm trying to do is to set a distance meaning a thousand meters in all directions longitudinally

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and latitudinal.

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I think those are real words anyway.

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So go ahead and pass in that coordinate coordinate.

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Sorry guys coordinate not the coordinate region.

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Now the latitudinal meters is going to be region radius.

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But remember this is just one way.

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So we actually need to multiply it by two in order to get 1000 meters on the left and the right side

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of us and then let's do that again for the distance the other way.

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Region radius times 2.0.

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Now we have a region radius going 1000 this way and that way and this way thousand that way north east

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south and west and all around.

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Let's try this one more time.

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Let's go ahead and build and run this.

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And let's check to see if it can properly set our region and zoom in.

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All right look at that.

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It centered us right on our little dot and we have about 1000 meters on either side top to bottom.

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That's our little radius here that we're paying attention to.

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Super super cool.

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Looks like it's zooming in perfectly.

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The only thing is we now need to set it so that this button when we click the center button it should

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center our location back down to the middle.

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That is the only thing.

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And to do that we're going to actually go into our Iby action we created Center Matt button was pressed

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and we're going to check against the authorization status just like we did before.

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So go ahead and type if Auth. status is equal to authorized always Or you can use the two straight straight

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slashes.

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I don't know what else to call them or authorization status is equal to when in use.

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So if it's authorized in any way we're going to go ahead and center the map on the user location.

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OK.

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Now let's try and build and run this and let's double check to make sure that that works.

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And then we're going to go ahead and move on to the next video.

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OK so we zoom in.

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That's lovely.

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Looks good.

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Let's go ahead and move the map.

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And if I clicked this it should zoom.

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Yeah there we go.

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OK it works.

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It zooms in Center us.

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You might be noticing this looks a little messed up and I think that's just because I'm using the iPhone

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6 or iPhone 7 plus and I'm a little bit zoomed out if I zoom in.

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It looks a lot better.

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So when I click it it animates and it zooms right to the center that's super super cool.

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All right so this works this is wonderful.

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In this video we have set it up so that we can get location services.

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We've given the user the power to choose always when in use or disallow.

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And we've also centered the map on the user's location using both a delegate method and the center map

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button.

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So very awesome.

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In the next video we're going to add a UI tap gesture recognizer so we can drop a pin exactly where

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we want on our map you see over there.