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Everybody this is Caleb with Dev slopes and in this video it's going to be a shorter one we're going



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to basically enable our camera to utilize the flash.



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We can set it to be automatic but I think it's cool to give the user the ability to control whether



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or not their flash is on or off.



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So we're going to do that.



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It's very easy.



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Let's go ahead and pull open that X code project and let's make it happen right now.



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So to begin we actually need to think about the flash option.



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We either can have the flash on or off and to control that we're going to use an enum to just kind of



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control the state of the flash the flash light.



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So an enum can be used for this.



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We can go and Hedden type ENM flash state and we can give it to cases either off or on Cayne we can



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use this ENM to basically save the state of the on or off light and then later we can tell the camera



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that we want it to be off or on based on what the user sets with the buttons.



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OK very cool.



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And actually before we even go further than this we're going to need to create a default state.



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So when the app opens we're going to set it to be off by default because I think most people would probably



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want it to be off unless they want it to be on for the most part.



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So to do that.



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Go ahead and type var flash control state.



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That's of course going to be of type flash state and we're going to actually just do this.



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We're going to set it to be off by default.



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Now when this variable is utilized when we actually instantiated it's going to get set to be off just



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from the get go.



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OK that's very cool.



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Very easy way to do it.



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And you know while I'm here I'm going to get rid of that comment.



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I don't need it.



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And now what we're going to do is we're going to utilize that ENM to go ahead and set up our settings



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for the flash and the way we do that is where we capture our photo.



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Did tap camera view.



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OK.



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So we have capture photo here.



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And the cool thing is one of the settings is the flash mode.



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So we're going to use our our variable appear flash control state which of course is set to off at the



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beginning.



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We're going to go ahead and we're going to type if Flash control state is equal to off.



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OK so when we open the app if it's equal to off we're going to call settings flash mode equals off else



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telling you guys this is easy stuff else settings.



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Flash mode equals on.



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And actually you know what you probably noticed there is an auto setting which automatically monitors



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the light around you but the user wants to have control ultimately over the flash mode whether it's



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on or off.



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OK.



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So that's that if it's off the flash mode will be off.



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If it's on the flash motile be on.



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All right.



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Super easy now that's how we're going to control it.



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But the thing we need to think about is how will we change the flash control state and we're going to



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use.



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Let me show you the example here where is it.



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We're going to use the flash button to change the state.



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If it's off and we tap the button it should change to say on and we should change the flash control



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state to be on as well.



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So to do that we're going to use an I.B. action as you may have suspected.



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So to do that go ahead and go to the main storyboard let it load.



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There we go.



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And go ahead and tap on the little assistant editor and it looks like we're already properly in our



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control or that's great.



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So scroll down to the bottom Iby actions are usually put at the bottom of a code file just by convention



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and go ahead and right click and then drag and we're going to use this to create an IB action.



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So go ahead and type choose action then type flash button was pressed to basically describe what happens



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when that IAB action is used.



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We're pushing a button to trigger that action.



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Now what we're going to do is we're basically going to use a switch to flip between the two different



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states.



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So go ahead and type switch and we're going to create a switch of flash control state and there are



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two cases of course that we can switch between one is case off and the other one is case on.



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Simple as that.



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Now if the case are sorry if the flash control state is off and we tap the button we should change the



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button title to say on OK if it's off and we tap it it should say on if it's on and we tap it it should



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stay off.



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So to do that go ahead and type flash control or flash button I suppose.



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And to change the title you need to do set title.



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Now of course the title string will say whoops we'll say flash on in caps and the UI control state is



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actually just normal.



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That way we can actually set it when we tap the button.



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And after that if if the flash control state is off we tap the button to make it say on.



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We should also change the flash control state to be on because then the flash should be on.



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OK.



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Simple as that.



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And you're probably guessing this already but basically we're going to do the exact opposite of this



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for the other case so I'm actually going to copy and paste it because it's very very very little code.



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I'm going to change the title to say flash off and the control state will also be off.



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Now believe it or not this is all we needed to do to set up our flash but there's one thing that's just



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been bugging me.



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This green view I want to change it to be white again because it shouldn't be shouldn't be green just



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doesn't look right.



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Kate go hadn't changed that to white and build and run this out.



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Let's go see how we did.



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Going to close.



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My assistant editor there.



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It should build and run.



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We should see it.



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And we should be able to turn the flash off.



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OK.



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Let's try to take a picture here.



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OK good.



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In a flash.



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Let's tap the button.



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The label changed and let's see when I take a picture now.



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Hey there's the flash.



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It works.



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That's so cool.



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So let's try it again.



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Yep we got a flash.



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Let's turn it off know flash see that super super cool awesome job guys that's all we needed to do to



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integrate the flash in the next video we're actually going to go ahead and we're going to set up A-V



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speech synthesizer so that we can speak what is happening what are what our phone is seeing right now



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it's seeing a remote control.



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We're going to set it up so that it says I think this is a remote control and I'm 99 percent sure if



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it's not sure it's going to say this message.



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I'm not sure what this is.



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Please try again.



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Simple as that.



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So we'll see in the next video.



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Amazing work with this one.



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This is Caleb with Dev slopes dot com.