Saving images to the File Manager | SwiftUI Crypto App #9

Рет қаралды 14,046

3 жыл бұрын

In the. last video, we successfully downloaded coin images into our list rows. They coin logos look great and give our app a much more professional feel. While most tutorials would probably stop here, we are going to take this an extra step further, and save these images to the .cachesDirectory within the FileManager. This will save the images to the device so that we can reuse images if they appear on the scree na second time, rather than downloading them again! Just another step toward making our app as efficient as possible.
It's important to note here that we are using the Caches Directory because these images aren't "required" in our app. If the directory ever gets too full, there's logic in the iPhone that will automatically start to empty the directory to free up space. Because of this, we are also including fall-back logic, so that if we ever don't have an image saved, we can easily start the download process for it.
*** LINKS:
- Downloadable Resources: www.swiftful-thinking.com/dow...
- CoinGecko API: www.coingecko.com/en/api
- CoinModel API: api.coingecko.com/api/v3/coin...
- Buy Me A Coffee: www.buymeacoffee.com/nicksarno
Next video: • Implement a custom and...
Last video: • Downloading Coin Image...
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Пікірлер: 53

@AZMerf 3 жыл бұрын

You never take the easy way out. You always promote good coding principles and techniques. Quality and efficiency reigns!

@SwiftfulThinking 3 жыл бұрын

I'm trying 🥵 It's a personal pet peeve because when I started learning, I followed some courses that steered me in the wrong direction (and I had no idea at the time). Looking back it's very aggravating, especially since some of those courses are still top sellers on Udemy lol

@KimbrellBrad 3 жыл бұрын

@@SwiftfulThinking That trap of skimming over the details really does do a disservice to students! I am finding the same issues from courses that I thought were expertly done! Thanks for the detailed, lucid explanations Nick!

@dando2841 11 ай бұрын

Swift is the first programming language I have ever tried to learn. I've watched basically every video in your playlists (except advanced videos) in the past 2 months. I have to say- you are such a great teacher, and the fact that these videos are free is like winning the lottery. Thank you for your concise explanations, I feel like I've learned so many practical things from you. Stay awesome.

@SwiftfulThinking 11 ай бұрын

That’s a lot of work on your part to get this far in only 2 months. Congrats and welcome to the channel! 🤙🥹🚀 thanks for the comment.

@KimbrellBrad 3 жыл бұрын

Wicked cool how the cache works! Another very portable concept for our toolkit! Thanks Nick!

@ShowMeLova Ай бұрын

Thanks a lot Nick! Your contribute is impossible to overestimate. I am so grateful to you!

@harishalbat3762 2 жыл бұрын

You're awesome man best teacher of Swift language I've ever seen. Keep going love your work!

@Julio-cu2hd 2 жыл бұрын

These series are pure gold, has everything a developer needs. Thanks Nick

@SwiftfulThinking 2 жыл бұрын

Thanks for watching Julio!

@mg_chai 2 жыл бұрын

Very much appreciate your efforts and time. You learn all these in a hard way but inspire us to learn it the right way!!!

@SwiftfulThinking 2 жыл бұрын

Thanks MG 🥳

@emremetilli727 2 ай бұрын

Your code quality is perfect! Thanks!

@paulraggett7837 3 жыл бұрын

Loving this course! Thank you 👏👍

@morreke 2 жыл бұрын

Brilliant ! Wish i already was at the same level as you, looks like second nature ! But, slowly getting there watching your videos ! Many concepts are starting to click now.

@mohd.rajeen4256 8 ай бұрын

Following this course from first video itself. Great learning experience. Although the UI till now looks simple and app only has 1 functional screen, but the main takeaway here are the efficient coding techniques and app architecture which you are following throughout this course. Will complete this hopefully.

@irfanrizvi161 3 жыл бұрын

I still got a lot to learn, thank you for everything bro.

@SwiftfulThinking 3 жыл бұрын

How you doing bro? This is a tougher course I know.

@Nunny25 2 жыл бұрын

Thanks as always :-)

@NathanWhite1 2 жыл бұрын

Great video! Quick question - any reason to use a singleton for the localFileManager, but static methods for the NetworkingManager?

@daniilakmatov5693 Жыл бұрын

It's grate course thanks bro!

@cinquain0 3 жыл бұрын

good stuff

@mrglwatson 2 жыл бұрын

The get images code seems closely coupled to the coin model making it more difficult than it should to re-use , is this something that gets addressed in later episodes or perhaps in another project?

@williamwildsmith5162 2 жыл бұрын

PDN. . . . = Pretty Darn Neat

@oronbz 2 жыл бұрын

Actually URLSession has it's own caching mechanism, so you pretty much get this out the box. If you turn on charles/proxyman, you'll see that no coin image is requested twice, even when you re-open the app. Although you did prove that the method has been called twice, but no request has been sent on consecutive method calls for the same image.

@oldschool84 3 ай бұрын

Tell me what is situation if I want to develop e-commerce app with a lot of pictures? And big sizes of pictures. Is this also is a good practice for that purposes? Also, I want to use Core Data for that app?

@mustafadzhabrailov 8 ай бұрын

why data disappears from the file manager. when some time passes until you launch the application the images that were added to the file manager are downloaded from the Internet

@alexvaiman4966 6 ай бұрын

why reinvent the wheel, king fisher made for this.

@yasseraltamimi6171 2 жыл бұрын

Just a small tip. in 3:55 when you press enter to clean the screen, you actually can press the trash in the bottom right corner to clean the output console😄

@SwiftfulThinking 2 жыл бұрын

ooo cool!

@gibber1sh-c6w 11 ай бұрын

@@SwiftfulThinkingCmd + K clear the terminal screen

@rtorcato 2 жыл бұрын

If createFolderIfNeeded fails you are returning no error and executing the code after the call to the function. It would be better to use throws and that function and try it. Also if the image has been updated by the api there is no way for you to get the latest image changes.

@code_pilot Жыл бұрын

Great Video! I have one question, why you didn't use NSCache, I used this class: class ImageCache { static let shared = ImageCache() private let cache = NSCache() private init() { } func set(for urlImage: String, image: UIImage?) { guard let image = image else { return } cache.setObject(image, forKey: NSString(string: urlImage)) } func get(for urlImage: String)-> UIImage? { cache.object(forKey: NSString(string: urlImage)) } }

@trevorschmidt8436 Жыл бұрын

One thing that might cause an issue is that coins ids are based on their rank and they are being saved based on that. So if a coin were to change ranks, the cached image would still return the old coins image. What would be better is to store it with the image’s urlString.

@fre.helfer Жыл бұрын

For me the coin id is their name. That's what I'm receiving from coin gecko

@dglalperen 2 жыл бұрын

Hey :) When i try to simulate the app it gives me following error: "the operation coudn´t be completed. (NSURLErrorDomain error -1)" Do you have any ideas why ? Because in when i google the error there is nothing about it Thank you !

@SwiftfulThinking 2 жыл бұрын

Make sure you have the correct URL and are using HTTPS (not HTTP)

@dglalperen 2 жыл бұрын

@@SwiftfulThinking thanks :)

@ppp-ti9yr 2 жыл бұрын

I got some problems. It always shows "Error saving image. Error Domain=NSCocoaErrorDomain Code=4 "The file “omisego.png” doesn’t exist."" and can't save the data. I just donot know why.

@ppp-ti9yr 2 жыл бұрын

i just solved the problem, i miss a ! in front of "FileManager.default.fileExists(atPath: url.path)". Thanks a lot, your video is really helperfull.

@ppp-ti9yr 2 жыл бұрын

i just solved the problem, i miss a ! in front of "FileManager.default.fileExists(atPath: url.path)". Thanks a lot, your videos are really helperfull.

@Adventurevictoria 2 жыл бұрын

Nick !! amazing content like always. just oner thing to mention. saving a file in the source code will be performed in the main thread. which can cause a problem if the image is big or lots of downloading simultaneously. your screen will be laggy. so using a " DispatchQueue.global(qos: .userInitiated).async() { self.fileManager.saveImage(image: returnImage, imageName: self.imageName, folderName: self.folderName) }" it can be done in the background thread and screen wont be laggy no matter how big job . :D