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High again in this case we we're going to set a timer for our application.

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This is a way for us to visually show the time that has passed since the user started playing the game.

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So essentially if I go in here this is the timer that's going to count up the seconds as well as minutes

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for us.

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Ever since the game begins often we set the reset function or we hit the reset button.

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So let's go ahead and see how I'm going to do that.

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Feed a few defend valuables for it.

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So I go up here but my view this lot.

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And I'm going to get myself to your valuables.

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One of them is.

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I'm going to call it same time.

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And that's going to be an integer that is currently at zero.

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So that's the current game time that we have to keep adding to it.

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The other one is a timer that's going to count the time for us.

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So I'm going to call this one game time and that's going to be a timer type and I'm going to make it

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an optional value because right at the beginning it doesn't have any values essentially.

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So once I have these two value bet I have to go ahead and program my timers to actually do something.

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I'm going to do that in the view of the Lord for now but later on you're going to change it and give

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it its own function.

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So in here I'm going to go ahead and get myself a little bit more space so things are easier to view

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and in my view that lot.

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And when I go ahead let me get those as well so everything is visible perfect.

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So I'm going to go ahead and say first you have to check for something and this check is not important.

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Now it will become important later on.

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So I have to say if the game timer is currently not to.

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If you have already initialized a game timer I know that doesn't happen in the view of the Lord but

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it does happen later on and we do things such as when we reset the game because then reset the game.

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There already is a timer running.

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So we have to essentially get rid of that timer.

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If it does exist.

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So I'm going to say if it does exist then do this say game tight timer invalidate So don't run it any

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more.

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And essentially it invalidated.

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Then I'm going to go ahead and say game timeout because a timeout d'Arthur schedule fifth time intervals.

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And here's the method I want to use.

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For those of you who are taking this course as a part of the U.S. completes bootcamp then you know exactly

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how it works.

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It is totally new for you.

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This is the timer that has gone on in this site.

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In this case every second is going to go within this very file is going to look for a function that

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I haven't made yet.

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So we have to create doesn't send any use that information is essentially doesn't use any extra information

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and does repeat.

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So that's my time.

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And now I have to actually to write a function that my time is going to go to.

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So for that I'm going to get myself a little bit more space in here and say I have a function I'm going

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to call this one timer function.

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It doesn't have any problem it doesn't return anything.

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It does a few things for me.

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One of them is every time we go to a timer function it increases the time.

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So a game time increases.

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So let's say plus equal 1.

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So we get one psych and added that to game time simply because we are calculating based on every one

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site.

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And if you want to have a timer that goes that every 10 of us I can then hear you to add every tenth

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of us I can.

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Of course is going to give me an error because Game time is an integer value but you could do it if

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you want it.

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But for now I'm going to go every cycle and I'm going to add one site and every time we go there then

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I'm going to have to shoot it in a label that call the time label.

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So I'm going to go in here and say time Liebert dot text.

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And now here's something that they have to do I have to format this time to essentially look like this.

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2 spaces for the minutes a space a column and other space and two spaces for seconds.

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So I have to formatted like this and to do that I'm going to go ahead and say Give me a let let's call

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this one time a minute and the timing is going to be a string that I'm going to produce with this format

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and the format they want to use is this the string that they want to produce.

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Is from anything we tool with spaces and integer from game time.

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Divided by 60.

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So imagine if the game time is below 60.

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So that will stay at zero.

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If the game time is between 60 to 100 and 20 that would become of one that's one minute.

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For instance 90 seconds it would be 90 divided by 60.

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That is one that is integer.

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And I'm going to show one extra leading zero for it.

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Instead of saying one minute sign it would say zero and one minute sign then that's my minutes and then

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I'm going to get the sack.

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And so at say time Second is going to be the same everything except that this time you're going to get

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time modulars 60.

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And that's way I end up getting the remainder of this division.

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So real quick example if the number of seconds is 95 game time divided by 60 will produce one.

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So we get 1 minute zero or one minute and then this one is going to get 95 modulars 60 and that's going

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to be 35.

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And that is going to produce 35.

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And a second signs and that's all I have to do and I have to put them all in here boy for my formatting.

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So I'm going to say the format they want to use is this one good time minutes and then get this space.

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They call them get us space and then another format full time science and that's all we had to do to

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get this one done.

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Now I have to use my timer function in the selector and the moment they do that is going to give me

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00:06:14,190 --> 00:06:20,360
an error saying it is not an objective c and that's a requirement of the swift version 4.

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00:06:20,550 --> 00:06:27,750
So now it's an objective c exposed function called the timer function that happens every second ever

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since the view loads before I hit the wrong button on this.

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I'll have to fix a few things.

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I just realized one of them is that I want to shoot two leading zeros so I have to say 0 2 and 0 2.

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I forgot to show the sign for the minutes.

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00:06:45,300 --> 00:06:50,820
So I have to save for the slash minutes and at the end of the seconds I forgot to show the sign for

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00:06:50,820 --> 00:06:51,620
the seconds.

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So that's the seconds.

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And one last thing that they want to do is if you do this IF game time is nil is happening and we have

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to re invalidate the time it means there was some time being shown and we have to reset that simply

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because it will take one second before this thing kicks in.

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So in hearing what I say if you have to invalidate the timer then also do this say time labeled dot

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text.

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00:07:20,880 --> 00:07:24,520
I'm here and I'm going to give it a manual a static value.

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Another static value is the zero zero for the slash minutes space column the space 0 0 and then forward

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the slash slackens and that's going to show us zero zero zero zero at the very beginning.

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Every time the game gets reset essentially it's either on the up and we should be able to see a timer

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running and showing us the right time 1 to perfect this Schwing us properly.

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Of course I don't have the reset function yet and that's something that we're going to add in the next

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lesson and on once that we should be able to see the reset actually happening.

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So this is all the code for this list and then me to reformat things real quick so we can see everything

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hopefully in just one view.

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So that is that and that is that and that's where we just get some space in here.

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So I added a timeout on all the time we reset the timer and we set a timer and we changed the value

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we see on the label every time the timer function runs.

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So let's keep it up to here.

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Let's go to our next lesson.