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2014/10/15 ¤U¤È 10:04:51
iphone Programming Glossary: cacheTricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance the height of the rows the table view can request this frequently Create a least recently used cache for the images used in the table and invalidate all the inactive entries when you receive a memory warning..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone fine as long as you change location when updating for support of user documents. Last there is a cache directory where you can put images that you don't care exist for the long term or not the phone may.. NSArray paths NSSearchPathForDirectoriesInDomains NSCachesDirectory NSUserDomainMask YES NSString cachePath paths objectAtIndex 0 BOOL isDir NO NSError error if NSFileManager defaultManager fileExistsAtPath.. paths objectAtIndex 0 BOOL isDir NO NSError error if NSFileManager defaultManager fileExistsAtPath cachePath isDirectory isDir isDir NO NSFileManager defaultManager createDirectoryAtPath cachePath withIntermediateDirectories..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints question I have build such kind of application using approximatively the same approach except I cache the generated image on the disk and always generate two to three images in advance in a separate thread...
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll the same one as the primary TableView If I use the same one is it as simple as clearing the FRC cache and then changing the predicate in the handleSearchForTerm searchString method Does the predicate have.. 20 fetchRequest setSortDescriptors sortDescriptors Edit the section name key path and cache name if appropriate. nil for section name key path means no sections . NSFetchedResultsController aFetchedResultsController.. managedObjectContext self.managedObjectContext sectionNameKeyPath nil cacheName nil aFetchedResultsController.delegate self fetchRequest release NSError error nil if aFetchedResultsController..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c of checking whether a delegate responds to a selector every time we want to message it you can cache that information when delegates are set. One very clean way to do this is to use a bitfield as follows..
iPhone UIView Animation Best Practice http://stackoverflow.com/questions/630265/iphone-uiview-animation-best-practice self UIView setAnimationTransition UIViewAnimationTransitionFlipFromRight forView myview cache YES myview removeFromSuperview UIView commitAnimations What is the best approach If you could provide..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically nil UIView setAnimationTransition UIViewAnimationTransitionFlipFromRight forView self.view cache YES blueViewController viewWillAppear YES yellowViewController viewWillDisappear YES yellowViewController.view..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud algorithm better in order to make a reasoned decision about where I can trust the system to cache my images and where I need to go the extra mile and do it myself. My current basic understanding is.. when memory runs out it gets a lot smaller. For example does anyone know for sure that the image cache behind imageNamed does not respond to didReceiveMemoryWarning It seems unlikely that Apple would not.. Rincewind added some authority. There are issues in iPhone OS 2.x where the imageNamed cache would not be cleared even after a memory warning. At the same time imageNamed has gotten a lot of use..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 way to grab data from OpenGL ES. It isn't readily apparent but it turns out that the texture cache support added in iOS 5.0 doesn't just work for fast upload of camera frames to OpenGL ES but it can.. object FBO with an attached texture with that texture having been supplied from the texture cache. Once you render your scene into that FBO the BGRA pixels for that scene will be contained within your.. the encoding from taking place at anything more than 8 9 FPS. Replacing this with the fast texture cache reads allows me to encode 720p video at 20 FPS now and the bottleneck has moved from the pixel reading..
Tricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance scrolling uiimage share improve this question Cache the height of the rows the table view can request this frequently Create a least recently used cache for the images used in the table and invalidate all the inactive entries when you receive a memory warning Draw everything in the UITableViewCell 's drawRect if..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone modify documents so if you are using Documents today you are fine as long as you change location when updating for support of user documents. Last there is a cache directory where you can put images that you don't care exist for the long term or not the phone may delete them at some point NSArray paths NSSearchPathForDirectoriesInDomains.. the long term or not the phone may delete them at some point NSArray paths NSSearchPathForDirectoriesInDomains NSCachesDirectory NSUserDomainMask YES NSString cachePath paths objectAtIndex 0 BOOL isDir NO NSError error if NSFileManager defaultManager fileExistsAtPath cachePath isDirectory isDir isDir NO NSFileManager defaultManager.. NSCachesDirectory NSUserDomainMask YES NSString cachePath paths objectAtIndex 0 BOOL isDir NO NSError error if NSFileManager defaultManager fileExistsAtPath cachePath isDirectory isDir isDir NO NSFileManager defaultManager createDirectoryAtPath cachePath withIntermediateDirectories NO attributes nil error error Note that..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints for OSX iphone ios ipad pdf calayer share improve this question I have build such kind of application using approximatively the same approach except I cache the generated image on the disk and always generate two to three images in advance in a separate thread. I don't overlay with a UIImage but instead draw the image..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll that retrieves only the matching items or can I use the same one as the primary TableView If I use the same one is it as simple as clearing the FRC cache and then changing the predicate in the handleSearchForTerm searchString method Does the predicate have to contain the initial predicate as well as the search terms.. Set the batch size to a suitable number. fetchRequest setFetchBatchSize 20 fetchRequest setSortDescriptors sortDescriptors Edit the section name key path and cache name if appropriate. nil for section name key path means no sections . NSFetchedResultsController aFetchedResultsController NSFetchedResultsController alloc initWithFetchRequest.. NSFetchedResultsController alloc initWithFetchRequest fetchRequest managedObjectContext self.managedObjectContext sectionNameKeyPath nil cacheName nil aFetchedResultsController.delegate self fetchRequest release NSError error nil if aFetchedResultsController performFetch error Replace this implementation..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c can provide better tool support. Speed Optimizations Instead of checking whether a delegate responds to a selector every time we want to message it you can cache that information when delegates are set. One very clean way to do this is to use a bitfield as follows @protocol SomethingDelegate NSObject @optional void something..
iPhone UIView Animation Best Practice http://stackoverflow.com/questions/630265/iphone-uiview-animation-best-practice nil UIView setAnimationDuration 0.75 UIView setAnimationDelegate self UIView setAnimationTransition UIViewAnimationTransitionFlipFromRight forView myview cache YES myview removeFromSuperview UIView commitAnimations What is the best approach If you could provide a snippet as well it'd be much appreciated. NOTE I've been..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically appear by flipping from right if blueViewController.view.superview nil UIView setAnimationTransition UIViewAnimationTransitionFlipFromRight forView self.view cache YES blueViewController viewWillAppear YES yellowViewController viewWillDisappear YES yellowViewController.view removeFromSuperview self.view insertSubview self.blueViewController.view..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud been fixed in recent releases. I'd like to understand the caching algorithm better in order to make a reasoned decision about where I can trust the system to cache my images and where I need to go the extra mile and do it myself. My current basic understanding is that it's a simple NSMutableDictionary of UIImages referenced.. of UIImages referenced by filename. It gets bigger and when memory runs out it gets a lot smaller. For example does anyone know for sure that the image cache behind imageNamed does not respond to didReceiveMemoryWarning It seems unlikely that Apple would not do this. If you have any insight into the caching algorithm.. on the Apple Dev Forums received some better traffic. Specifically Rincewind added some authority. There are issues in iPhone OS 2.x where the imageNamed cache would not be cleared even after a memory warning. At the same time imageNamed has gotten a lot of use not for the cache but for the convenience which has probably..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 share improve this question As of iOS 5.0 there is now a faster way to grab data from OpenGL ES. It isn't readily apparent but it turns out that the texture cache support added in iOS 5.0 doesn't just work for fast upload of camera frames to OpenGL ES but it can be used in reverse to get quick access to the raw pixels within.. grab the pixels for an OpenGL ES rendering by using a framebuffer object FBO with an attached texture with that texture having been supplied from the texture cache. Once you render your scene into that FBO the BGRA pixels for that scene will be contained within your CVPixelBufferRef so there will be no need to pull them down.. reading 720p video frames for encoding to disk. It limited the encoding from taking place at anything more than 8 9 FPS. Replacing this with the fast texture cache reads allows me to encode 720p video at 20 FPS now and the bottleneck has moved from the pixel reading to the OpenGL ES processing and actual movie encoding parts..
Tricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance this question Cache the height of the rows the table view can request this frequently Create a least recently used cache for the images used in the table and invalidate all the inactive entries when you receive a memory warning Draw everything..
How can I get a writable path on the iPhone? http://stackoverflow.com/questions/1567134/how-can-i-get-a-writable-path-on-the-iphone today you are fine as long as you change location when updating for support of user documents. Last there is a cache directory where you can put images that you don't care exist for the long term or not the phone may delete them at some.. them at some point NSArray paths NSSearchPathForDirectoriesInDomains NSCachesDirectory NSUserDomainMask YES NSString cachePath paths objectAtIndex 0 BOOL isDir NO NSError error if NSFileManager defaultManager fileExistsAtPath cachePath isDirectory.. NSString cachePath paths objectAtIndex 0 BOOL isDir NO NSError error if NSFileManager defaultManager fileExistsAtPath cachePath isDirectory isDir isDir NO NSFileManager defaultManager createDirectoryAtPath cachePath withIntermediateDirectories..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints share improve this question I have build such kind of application using approximatively the same approach except I cache the generated image on the disk and always generate two to three images in advance in a separate thread. I don't overlay..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll items or can I use the same one as the primary TableView If I use the same one is it as simple as clearing the FRC cache and then changing the predicate in the handleSearchForTerm searchString method Does the predicate have to contain the initial.. fetchRequest setFetchBatchSize 20 fetchRequest setSortDescriptors sortDescriptors Edit the section name key path and cache name if appropriate. nil for section name key path means no sections . NSFetchedResultsController aFetchedResultsController.. fetchRequest managedObjectContext self.managedObjectContext sectionNameKeyPath nil cacheName nil aFetchedResultsController.delegate self fetchRequest release NSError error nil if aFetchedResultsController performFetch..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c Optimizations Instead of checking whether a delegate responds to a selector every time we want to message it you can cache that information when delegates are set. One very clean way to do this is to use a bitfield as follows @protocol SomethingDelegate..
iPhone UIView Animation Best Practice http://stackoverflow.com/questions/630265/iphone-uiview-animation-best-practice UIView setAnimationDelegate self UIView setAnimationTransition UIViewAnimationTransitionFlipFromRight forView myview cache YES myview removeFromSuperview UIView commitAnimations What is the best approach If you could provide a snippet as well..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud to understand the caching algorithm better in order to make a reasoned decision about where I can trust the system to cache my images and where I need to go the extra mile and do it myself. My current basic understanding is that it's a simple NSMutableDictionary.. It gets bigger and when memory runs out it gets a lot smaller. For example does anyone know for sure that the image cache behind imageNamed does not respond to didReceiveMemoryWarning It seems unlikely that Apple would not do this. If you have.. better traffic. Specifically Rincewind added some authority. There are issues in iPhone OS 2.x where the imageNamed cache would not be cleared even after a memory warning. At the same time imageNamed has gotten a lot of use not for the cache..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 5.0 there is now a faster way to grab data from OpenGL ES. It isn't readily apparent but it turns out that the texture cache support added in iOS 5.0 doesn't just work for fast upload of camera frames to OpenGL ES but it can be used in reverse to.. by using a framebuffer object FBO with an attached texture with that texture having been supplied from the texture cache. Once you render your scene into that FBO the BGRA pixels for that scene will be contained within your CVPixelBufferRef.. to disk. It limited the encoding from taking place at anything more than 8 9 FPS. Replacing this with the fast texture cache reads allows me to encode 720p video at 20 FPS now and the bottleneck has moved from the pixel reading to the OpenGL ES..
http://stackoverflow.com/questions/11486828/table-view-scrolling-async NSMutableArray or used imageNamed but at Best way to cache images on ios app Caleb introduced me to the wonderful NSCache class which simplifies everything Make sure your cached images are thumbnail sized or else you'll always have a little stuttering.. to gain proficiency with Instruments. Here is my code. In viewDidLoad I initialize my image cache void initializeCache _imageCache NSCache alloc init _imageCache.name @ Custom Image Cache _imageCache.countLimit 50 And then I use this in my.. proficiency with Instruments. Here is my code. In viewDidLoad I initialize my image cache void initializeCache _imageCache NSCache alloc init _imageCache.name @ Custom Image Cache _imageCache.countLimit 50 And then I use this in my tableView cellForRowAtIndexPath..
Clear CATiledLayers Cache When Changing Images http://stackoverflow.com/questions/1274680/clear-catiledlayers-cache-when-changing-images CATiledLayers Cache When Changing Images I have a UIScrollView with a single subview a UIView backed by a CATiledLayer. All is working well..
How to save the content in UIWebView for faster loading on next launch? http://stackoverflow.com/questions/1343515/how-to-save-the-content-in-uiwebview-for-faster-loading-on-next-launch my case it works . What you need to understand is the global flow YOU loadRequest on a UIWebView This goes into NSURLCache to ask is there something cached for this request NSCachedURLResponse cachedResponseForRequest NSURLRequest request From.. flow YOU loadRequest on a UIWebView This goes into NSURLCache to ask is there something cached for this request NSCachedURLResponse cachedResponseForRequest NSURLRequest request From that here's what I do to handle the cache on the disk on.. that here's what I do to handle the cache on the disk on my side to speed up the load of a UIWebView Subclass the NSURLCache and override the get control over the NSCachedURLResponse cachedResponseForRequest NSURLRequest request selector Reimplement..
Tricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance for improving uitableview scrolling performance iphone uitableview scrolling uiimage share improve this question Cache the height of the rows the table view can request this frequently Create a least recently used cache for the images used..
UIWebView and NSURLCache have a troubled relationship http://stackoverflow.com/questions/2090286/uiwebview-and-nsurlcache-have-a-troubled-relationship and NSURLCache have a troubled relationship I am trying to solve 2 things in my UIWebView Load local assets in place of remote ones under.. back without needing to reload it's html form the server So to handle #1 and #2 I implemented a custom subclass NSURLCache . It gets called when the webview requests assets and I can send along the local ones instead aborting the server call for.. UIWebView will ALWAYS reload the HTML when going back. So I tried to force caching of the HTML in my custom NSURLCache class. It seems to work and returns the instance of NSCachedURLResponse with the HTML I want but the UIWebView fails to..
Cache URL images iphone UITableview http://stackoverflow.com/questions/2265137/cache-url-images-iphone-uitableview URL images iphone UITableview I'm seeking a tutorial on how to cache images loaded from a url into cells of a uitableview... pieces. iphone cocoa touch uitableviewcell image caching share improve this question Here is a simple ImageCache implementation using NSCache. ImageCache is a singelton. ImageCache.h #import Foundation Foundation.h @interface ImageCache.. touch uitableviewcell image caching share improve this question Here is a simple ImageCache implementation using NSCache. ImageCache is a singelton. ImageCache.h #import Foundation Foundation.h @interface ImageCache NSObject @property nonatomic..
Core Data Inferred Migration ??Automatic “lightweight” vs Manual http://stackoverflow.com/questions/2535373/core-data-inferred-migration-automatic-lightweight-vs-manual error results in drastically different timing for the exact same dataset. Profile results on an original iPhone 2G Cache size 1.785 MB on disk. Automatic inferred lightweight migration PROFILE CacheManager migrateStore PROFILE 0.6130 0.6130.. Profile results on an original iPhone 2G Cache size 1.785 MB on disk. Automatic inferred lightweight migration PROFILE CacheManager migrateStore PROFILE 0.6130 0.6130 models loaded PROFILE 1.1759 0.5629 delegate CacheManagerWillMigrate PROFILE 1.2516.. migration PROFILE CacheManager migrateStore PROFILE 0.6130 0.6130 models loaded PROFILE 1.1759 0.5629 delegate CacheManagerWillMigrate PROFILE 1.2516 0.0757 persistent store coordinator loaded PROFILE 5.1436 3.8920 automatic lightweight..
iPhone Web App Cache Persistence http://stackoverflow.com/questions/264367/iphone-web-app-cache-persistence Web App Cache Persistence How can I write an ASP.NET C# application that will render a page can be permanently cached on the iPhone when..
Max size iPad / iPhone Offline Application Cache http://stackoverflow.com/questions/2772908/max-size-ipad-iphone-offline-application-cache size iPad iPhone Offline Application Cache Anyone knows the max size of Safari's 'Offline Application Cache' on the iPad iPhone. Looks like it's 5MB. Is there any.. size iPad iPhone Offline Application Cache Anyone knows the max size of Safari's 'Offline Application Cache' on the iPad iPhone. Looks like it's 5MB. Is there any way to enlarge this size Offline application cache docs http developer.apple.com.. docs http developer.apple.com safari library documentation iPhone Conceptual SafariJSDatabaseGuide OfflineApplicationCache OfflineApplicationCache.html iphone caching ipad offline share improve this question I have the same problem on iPhone...
NSFileManager creating folder (Cocoa error 513.) http://stackoverflow.com/questions/3439408/nsfilemanager-creating-folder-cocoa-error-513 Instead of writing to the bundle your app can write to one of three accepted app specific folders Documents Temp and Cache . Most likely you will want to write to the Documents folder. These folders are only accessible to your app. No other app..
Is it possible to get information about all apps installed on iPhone? http://stackoverflow.com/questions/3878197/is-it-possible-to-get-information-about-all-apps-installed-on-iphone NSString bundleIdentifier static NSString const cacheFileName @ com.apple.mobile.installation.plist NSString relativeCachePath @ Library stringByAppendingPathComponent @ Caches stringByAppendingPathComponent cacheFileName NSDictionary cacheDict.. @ com.apple.mobile.installation.plist NSString relativeCachePath @ Library stringByAppendingPathComponent @ Caches stringByAppendingPathComponent cacheFileName NSDictionary cacheDict nil NSString path nil Loop through all possible paths.. find the cache here their home directory is var mobile path NSHomeDirectory stringByAppendingPathComponent relativeCachePath break case 1 App Store apps and Simulator will find the cache here home var mobile is 2 directories above sandbox folder..
Rendering a UIWebView into an ImageContext http://stackoverflow.com/questions/469764/rendering-a-uiwebview-into-an-imagecontext dozens of UIWebView sized small pieces. Then we can capture every small pieces individually and save them into our Cache. I implemented this by calculating page offsets and use UIGraphicsBeginImageContext webView.frame.size to get a array of..
Caching with AVPlayer and AVAssetExportSession http://stackoverflow.com/questions/6259095/caching-with-avplayer-and-avassetexportsession Thanks PS Here are some questions from people trying to accomplish the same thing but with MPMoviePlayerController Cache Progressive downloaded content in MPMoviePlayerController Simultaneously stream and save a video Caching videos to disk..
Is iOS developer able to view file system? http://stackoverflow.com/questions/7377280/is-ios-developer-able-to-view-file-system this question One can view files in an iOS device but only in that your App's sandbox. Every App has got a Documents Cache and temp folders. I think the first two are automatically backed up by iTunes when you connect your device the latter is.. two are automatically backed up by iTunes when you connect your device the latter is not backed up. Example to get Cache directory path NSString getCacheDirPath NSString path nil NSArray myPathList NSSearchPathForDirectoriesInDomains NSCachesDirectory.. up by iTunes when you connect your device the latter is not backed up. Example to get Cache directory path NSString getCacheDirPath NSString path nil NSArray myPathList NSSearchPathForDirectoriesInDomains NSCachesDirectory NSUserDomainMask YES if..
iCloud + Storage of media in iPhone Documents folder http://stackoverflow.com/questions/7762743/icloud-storage-of-media-in-iphone-documents-folder fame has a good take on the issue which is that the recommended location for storing downloadable files is in Library Caches. However the problem is that both tmp and Caches can be 'cleaned' anytime the OS decides that the device is running low.. the recommended location for storing downloadable files is in Library Caches. However the problem is that both tmp and Caches can be 'cleaned' anytime the OS decides that the device is running low on storage. If your app is cleaned then the data.. However you will also have to set a do not backup flag on them as every file in Library except for those in Library Cache or tmp are backed up by default. Set the flag on PrivateDocs folder with this command #include sys xattr.h BOOL addSkipBackupAttributeToItemAtURL..
iOS 5 does not allow to store downloaded data in Documents directory? http://stackoverflow.com/questions/8209406/ios-5-does-not-allow-to-store-downloaded-data-in-documents-directory be recreated by your application should be stored in the Documents directory and rest should be stored to Library Caches directory In my application I am using server model of in app purchase for non consumable product. For this I am storing.. the downloaded products. My question is 1. Should I have to change my code to store the downloaded data to Library Caches directory instead of to the Documents directory 2. Where should my database file be placed to Documents or Caches If I.. Caches directory instead of to the Documents directory 2. Where should my database file be placed to Documents or Caches If I put it products in the Caches then I have to change the logic of retrieval also since it is considered that if record..
http://stackoverflow.com/questions/9744644/uiwebview-without-cache without Cache I want to load a webview without cache Create a URL object. NSURL url NSURL URLWithString urlAddress URL Request Object.. loadRequest requestObj Thanks for help. Jean. iphone ios share improve this question Remove and disable all URL Cache but doesn't seem to affect the memory NSURLCache sharedURLCache removeAllCachedResponses NSURLCache sharedURLCache setDiskCapacity.. iphone ios share improve this question Remove and disable all URL Cache but doesn't seem to affect the memory NSURLCache sharedURLCache removeAllCachedResponses NSURLCache sharedURLCache setDiskCapacity 0 NSURLCache sharedURLCache setMemoryCapacity..
http://stackoverflow.com/questions/9763979/download-image-asynchronously implemented that using AsyncImageView which is inherited from UIImageView . What it does is it stores images in Cache memory fetched from a url and whenever you need to load image from the same URL again it will simply load it from the cache..
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