Toptal offers top iOS developers, programmers, and software engineers on an hourly, part-time, or full-time contract basis. Clients include Thumbtack, Bridgestone, and Motorola. Crop images with Slim, a cross platform Image Cropping and Uploading plugin. Solutions I'll start by showing a safe version of the other answers, with the addition of how to handle UI updates. Figure out what went wrong and handle the error.
Alamofire And finally, I'd like to give a final example using Alamofire. DocumentDirectory, inDomain:. Make sure you have a backup plan for where to save the image. Handle the error. Community Bot 1 1 1 silver badge. HomelessPeopleCanCode Near the top of my answer under the "Solutions" header I included that method and used it in all of my Objective-C examples, however there are more options available.
What to pass as parameter in 'destination'? Brilliant answer, very informative. Thank you! One of the greatest answer I've read on this site. Very useful and informative. Thanks for taking the time to educate us plebls ; — Alexandre G. Asynchronous downloaded images with caching Asynchronous downloaded images with caching Here is one more repos which can be used to download images in background. First link is dead — AyAz. With this code you just store the original data.
That's the main concept. According to apples release notes it means the following: Small data values like image thumbnails may be efficiently stored in a database, but large photos or other media are best handled directly by the file system. Alexander Alexander 7, 8 8 gold badges 43 43 silver badges 74 74 bronze badges. Bobby Bobby 5, 3 3 gold badges 32 32 silver badges 36 36 bronze badges. Mohammad Asif Mohammad Asif 91 1 1 silver badge 6 6 bronze badges. Jagat Dave 1, 3 3 gold badges 22 22 silver badges 30 30 bronze badges.
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. By updating the images dictionary first, we make sure that subsequent callers will reuse the in progress task.
At this point, we have a complete image loader done. Pretty sweet, right? I'm always delightfully surprised to see how simple actors make complicated flows that require careful synchronization to correctly handle concurrent access. The custom SwiftUI view that we'll create in this section is mostly intended as a proof of concept. I've tested it in a few scenarios but not thoroughly enough to say with confidence that this would be a better async image than the built-in AsyncImage.
However, I'm pretty sure that this is an implementation that should work fine in many situations. To do this, we'll need to add a custom value to the EnvironmentValues object:. This code adds an instance of ImageLoader to the SwiftUI environment, allowing us to easily access it from within our custom view. To keep things simple, we'll always use a URLRequest internally. When the view is first rendered, image will be nil so we'll just render a placeholder rectangle.
I didn't give it any size, that would be up to the user of RemoteImage to do. The SwiftUI view has a task modifier applied. This modifier allows us to run asynchronous work when the view is first created. In this case, we'll use a task to ask the image loader for an image. When the image is loaded, we update the State var image which will trigger a redraw of the view. This SwiftUI view is pretty simple and it doesn't handle things like animations or updating the image later.
Two images are included in the project one small: woodenTile. The result is the same with both. This worked for me:. You've specifically set it up to use UILongPressGestureRecognizer which waits, by default, a half a second before doing anything.
The main thread is still processing events, but nothing is going to happen until that GR times out. If you do this:. EDIT 2: I've looked at the code, as posted to github, running on an iPad 2, and I simply do not get the hiccup you're describing.
In fact, it's quite smooth. Here's a screenshot from running the code in the CoreAnimation instrument:. On the bottom graph, you can see the blip at about 16s which is where the image is first loaded, but you can see that there's not a drop in the frame rate.
Just from visual inspection, I see the selection layer intersect, and there's a small, but observable delay between the first intersection and the appearance of the image. As far as I can tell, the background loading code is doing its job as expected. You can use AFNetworking library , in which by importing the category.
I had a very similar issue with my application where I had to download lot of images and along with that my UI was continuously updating. Below is the simple tutorial link which resolved my issue:. Why don't you use third party library like AsyncImageView?
Using this, all you have to do is declare your AsyncImageView object and pass the url or image you want to load. An activity indicator will display during the image loading and nothing will block the UI. This block will be processed by GCD when the queue will be ready i. That's why you can't see your woodenTile loaded and assigned to self. Consider using SDWebImage : it not only downloads and caches the image in the background, but also loads and renders it.
I've used it with good results in a tableview that had large images that were slow to load even after downloaded. When you are using AFNetwork in an application, you do not need to use any block for load image because AFNetwork provides solution for it.
As below:. Swift 3: foregroundImage. Thanks, mate, this helped me. Add a comment. Mark Moeykens Mark Moeykens Swift 4: : This will shows loader while loading the image. Jack Jack It works. Just copy activityIndicator removal in error case too. ScaleAspectFill self. Do we really need those overridden inits? Aren't the inits inherited anyway? Seems like we're just overriding here just to call super on itself, which strikes me as redundant.
String if url! UIImage data: data! Manee ios Manee ios 1, 10 10 silver badges 14 14 bronze badges. Anonymous 9, 2 2 gold badges 20 20 silver badges 38 38 bronze badges. Any chance you can write up something asynchronous? I had to unwrap the NSData with an "! FYI : For swift It's better when you code with Swift 2. Mohan 2, 16 16 silver badges 30 30 bronze badges. Thanks — Hammad Tariq. I don't think you should be loading UIImage data: data as Data on the main thread. That should be done in the background thread.
Technically mapped, not replaced. Cody Cody 4, 3 3 gold badges 35 35 silver badges 40 40 bronze badges. What's the problem? In this line """ URLSession. Bobby Bobby 5, 3 3 gold badges 32 32 silver badges 36 36 bronze badges.
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