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This lesson is all about understanding and fixing potential problems with pod installation. At some point,
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you'll be installing your own pods for your own projects.
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So it's really important to understand how this process works, so you'll be able to fix them if they
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arise in the future.
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In the process, you're going to get an understanding of how pods are updated and how to specify a particular
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version of the pod using the pod file.
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The first thing you should do after installing your pods and opening your xcworkspace is to build your
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project.
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So hold on command on your keyboard and hit B in order to build. And in certain cases, you might get errors
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that are because of certain lines of code in the newly added pod files. Because we know before we added
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the pod files, we had no problems.
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But now we've got 4 errors.
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So let's click on it and see what it's telling us to do.
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It's telling us that there's a number of things that have updated in Swift. So there's some changes that
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it's suggesting us to make.
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For example, here, it's telling us that the character's property is no longer used.
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Instead, we should be using that string directly. So it wants us to change some code that comes from this
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pod CLTypingLabel.
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Now, what's going on here?
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Well, if we head back over to our CLTypingLabel page on CocoaPods, and then navigate to the GitHub
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page through this link, if you take a look at the Pull requests and look at the Closed ones, you can see
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that people have been updating this repository to fix some of these problems, right, the characters method
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which we saw just now.
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So in this case, it's getting the error: "The method characters is deprecated," so instead, they're updating
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the code to use the string method instead.
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And you can take a look at the files that they've changed.
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So for example, instead of characters.count > 0, they've changed it to this line here.
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So let's go ahead and copy this line which was added and remove this line 139
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that was deleted, and then click Unlock to unlock the file, and then replace it with this new line
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that we got from the GitHub.
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So, now if I hit command B, you can see that I no longer have any errors associated with this line.
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So clearly, we're getting some fixes that have been added to the repository.
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Now, when you head back over to the code tab and you click on releases, you can see that the latest version
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of this pod or this repository that was released is 0.4.0.
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And this is the release that supports Swift 4 and 5.
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So notice how a lot of these errors are because the code is using a lower version of Swift.
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In fact, a lot of these errors have actually been addressed already by the makers of this particular pod.
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But if we take a look inside our Flash-Chat-iOS13 folder, you can see that there's a file called
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PodFile.lock.
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So if you go ahead and right click on it, then select Open With, and we're going to, again, select Xcode
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to open it, and then click Open. You can see that it tells us which pods we have added to our project.
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And the only one is this one called CLTtypingLabel. And the version, though,
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is 0.3.0.
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So it's lower than the latest release. In fact, our one
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is this one that was released in October, 2017.
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So why is it that we're not able to get this latest version? Now, if we go back to the CocoaPod guides
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and we look at the pod file Reference, you can see that we can actually specify a specific version of
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the pod that we want to use.
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So in this case, they're using AFNetworking 1.0 version.
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So if we go back to our pod file, so not the Podfile.lock, but the actual pod file which you'll
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be able to find inside your Xcode project as well right here,
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notice how it's on RB or Ruby file and it has all of the changes that we made before.
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Well, instead of just telling it to use any old pod file, we're going to add the same syntax as we see
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here.
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So a comma followed by a single quote, and inside a single quote,
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we've got a tilde symbol, and then a right angle bracket, and then the version of that pod that we
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want to use.
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So back over here, I'm going to add, first, a comma, then a single quote, and then a tilde symbol, a right
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angle bracket, space, and then 0.4.0, and then closing it off with a single quote.
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So just check to see that what you've typed is exactly the same as what you see on the screen right
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now.
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And then we're going to hit save.
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So, now let's close down our project, go back to Terminal, and we're going to run a pod install again.
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And instead typing it out, I'm just going to hit the up arrow which you'll see cycles through all of the
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previous commands I've issued. And the one immediately before was pod install which I wrote here.
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So, now I've got that selected, I'm gonna hit enter to execute it. And notice how we're getting an error
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here.
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It says, "CocoaPods could not find compatible versions with 'CLTypingLabel.'"
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This particular version, the specification satisfying naught .4.0 were found, but they
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required a higher minimum deployment target.
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So what is all of this mean in English anyways?
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Well, it means that, yes, they found this 0.4.0 version of CLTypingLabel, but that
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version requires you to have a higher minimum deployment target.
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So let's go ahead and open up our pod file again. And remember how back when we started out creating
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our pod file, we specified a minimum deployment target of 9.0. 
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Well, this 0.4.0 version actually requires a higher minimum than 9.0.
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How would we know this?
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Well, if I go back to our GitHub page for CLTypingLabel and we go into the pod spec file, you'll see
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that the specification requires platform minimum iOS version 10.0 or above.
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So that's why we're not able to get the latest version of this pod is because we're saying that our
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project has to support everything from 9 and above,
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but this pod is only available for projects which are 10 or above.
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So let's go ahead and fix this.
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Let's change this to, in fact, to go all the way to 13 because we're only going to support iPhones running
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iOS 13 or above.
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Now, we're going to hit save on our pod file and we're going to leave this line as it is, and then we're
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going to go back to our Terminal and we're going to run pod install again.
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And notice how this time we installed 0.4.0,
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whereas it used to be 0.3.0.
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We've made all of those updates. And now if we open up are white xcworkspace project for our FlashChat again,
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you'll notice that when we hit command B to build that we don't have any of those errors
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that we saw earlier on.
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And in fact, it's completely compatible with the latest version of iOS and Swift, and we're no longer
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getting any errors that are coming from that latest pod.
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Now, I've chosen this pod, in particular, to show you firstly because it is able to replace all of the
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code that we have to write here in order to animate our label.
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But it also allowed me to show you the issues with the pod spec, as well as the minimum versioning in
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our pod file, because these are things that you might encounter in future when you're using different
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third party libraries that you might need. But normally, incorporating a CocoaPod is not that difficult.
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All you have to do is create the profile, add the pods that you want to incorporate, run pod install, and
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you should be ready to go without all of these errors that you have to fix.
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But now that we've finally added our CLTypingLabel, let's check out how we're supposed to use it.
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And that's exactly what we'll do in the next lesson.
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So for all of that and more, I'll see you there.