SDWebImage Download image and store to cache for key - objective-c

Question

Hello I am using the SDWebImage framework in a project and I want to download and cache images, but I think my code is storing an image in the cache twice? Is there any way to store the image in the cache by a key only once? Here is my code.
SDWebImageManager *manager = [SDWebImageManager sharedManager];
[manager downloadWithURL:[NSURL URLWithString:url] options:0 progress:^(NSUInteger receivedSize, long long expectedSize) {
} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished) {
if(image){
NSString *localKey = [NSString stringWithFormat:#"Item-%d", i];
[[SDImageCache sharedImageCache] storeImage:image forKey:localKey];
}
}];
Is there something that I missed? Looks like doing this in my allocations instrument is pilling up a lot of memory.

Answer 1

I'm surprised nobody answered this question, but I've had a similar question and came across this, so I'll answer it for people viewing this going forward (assuming you've sorted this out yourself by now).
To directly answer your question, yes, you are caching the image twice.
Download calls to SDWebImageManager automatically cache images with keys based on the absoluteString of the image's url. If you want your own key, you can use the download call on SDWebImageDownloader which as far as I can tell does NOT cache by default. From there you can call the sharedImageCache as you're already doing and cache with whatever key you want.
That aside, it is strange you're seeing allocations piling up in any case as SDWebImage likes to cache to disk and not memory generally. Maybe something else is going on at the same time?

Answer 2

In Swift use the code below to download an image and to store it in the cache:
//SDWebImageManager download image with High Priority
SDWebImageManager.sharedManager().downloadImageWithURL(NSURL(string: imageUrl), options: SDWebImageOptions.HighPriority, progress: { (receivedSize :Int, ExpectedSize :Int) in
SVProgressHUD.show()
}, completed: { (image :UIImage!, error:NSError!, cacheType :SDImageCacheType, finished :Bool,imageUrl: NSURL!) in
if(finished) {
SVProgressHUD.dismiss()
if((image) != nil) {
//image downloaded do your stuff
}
}
})
Swift 3 version:
SDWebImageManager.shared().downloadImage(with: NSURL(string: "...") as URL!, options: .continueInBackground, progress: {
(receivedSize :Int, ExpectedSize :Int) in
}, completed: {
(image : UIImage?, error : Error?, cacheType : SDImageCacheType, finished : Bool, url : URL?) in
})
Objective-C version:
[[SDWebImageDownloader sharedDownloader] downloadImageWithURL:[NSURL URLWithString:imageUrl] options:SDWebImageDownloaderUseNSURLCache progress:nil completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
if (image && finished) {
// Cache image to disk or memory
[[SDImageCache sharedImageCache] storeImage:image forKey:CUSTOM_KEY toDisk:YES];
}
}];

Answer 3

SWIFT 5 & Latest SDWebImage 5.2.3
SDWebImageManager.shared.loadImage(
with: album.artUrlFor(imageShape: .square),
options: .continueInBackground, // or .highPriority
progress: nil,
completed: { [weak self] (image, data, error, cacheType, finished, url) in
guard let sself = self else { return }
if let err = error {
// Do something with the error
return
}
guard let img = image else {
// No image handle this error
return
}
// Do something with image
}
)

Answer 4

Swift 4:
SDWebImageManager.shared().loadImage(
with: URL(string: imageUrl),
options: .highPriority,
progress: nil) { (image, data, error, cacheType, isFinished, imageUrl) in
print(isFinished)
}

Answer 5

SDWebImage caches the image both to disk as well as memory. Let's go through this:
You download the image from a new url.
It gets cached to memory and disk.
If you call the image in the same session, it is retrieved from the memory.
Let's say you re-run the app and then access the url, it will check the memory, where the image won't be there, then it will check the disk, and get it from there. If not, it will download it.
The image stays in disk for a week by the standard setting.
So, you don't need to worry about caching. SDWebImage takes care of it pretty damn well.
You can do custom implementation for caching as well as image refresh from the cache in case you want the settings as per your HTTP caching header as well.
You can find the complete details on their github page here.

Answer 6

Swift 4.0.
let url = URL(string: imageUrl!)
SDWebImageManager.shared().imageDownloader?.downloadImage(with: url, options: .continueInBackground, progress: nil, completed: {(image:UIImage?, data:Data?, error:Error?, finished:Bool) in
if image != nil {.
}
})

Answer 7

Try APSmartStorage (https://github.com/Alterplay/APSmartStorage) instead of SDWebImage.
APSmartStorage gets data from network and automatically caches data on disk or in memory in a smart configurable way. Should be good enough for your task.

Answer 8

Yes is possible to download the image using SDWebImage And store into local memory Manually.
Downloaded Image store into local memory using SDWebImage
func saveImage(url: URL, toCache: UIImage?, complation: #escaping SDWebImageNoParamsBlock) {
guard let toCache = toCache else { return }
let manager = SDWebImageManager.shared()
if let key = manager.cacheKey(for: url) {
manager.imageCache?.store(toCache, forKey: key, completion: complation)
}
}
Load image from memory using image URL
static func imageFromMemory(for url: String) -> UIImage? {
if let encoded = url.addingPercentEncoding(withAllowedCharacters: .urlFragmentAllowed),
let url = URL(string: encoded) {
let manager = SDWebImageManager.shared()
if let key: String = manager.cacheKey(for: url),
let image = manager.imageCache?.imageFromMemoryCache(forKey: key) {
return image
}
}
return nil
}

Answer 9

//CREATE A CUSTOME IMAGEVIEW AND PASS THE IMAGE URL BY ARRAY(INDEXPATH.ROW)
(void) loadImage:(NSString *)imageLink{
imageLink = [imageLink stringByReplacingOccurrencesOfString:#" " withString:#"%20"];
SDWebImageManager *manager = [SDWebImageManager sharedManager];
[manager loadImageWithURL:[NSURL URLWithString:imageLink] options:SDWebImageDelayPlaceholder progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
} completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
imageFrame.image = image;
}];
}

Answer 10

Swift 5.1
import UIKit
import SDWebImage
extension UIImageView{
func downloadImage(url:String){
//remove space if a url contains.
let stringWithoutWhitespace = url.replacingOccurrences(of: " ", with: "%20", options: .regularExpression)
self.sd_imageIndicator = SDWebImageActivityIndicator.gray
self.sd_setImage(with: URL(string: stringWithoutWhitespace), placeholderImage: UIImage())
}
}
How to use
let myUrl = "https://www.example.com"
myImageView.downloadImage(url: myUrl)

Answer 11

SDWebImageManager *manager = [SDWebImageManager sharedManager];
[manager downloadImageWithURL:ImageUrl options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize)
{
} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
if(image){
NSLog(#"image=====%#",image);
}
}];