sdwebimage的使用

Web Image

This library provides a category for UIImageVIew with support for remote images coming from the web.

It provides:

An UIImageView category adding web image and cache management to the Cocoa Touch frameworkAn asynchronous image downloaderAn asynchronous memory + disk image caching with automatic cache expiration handlingAnimated GIF supportWebP format supportA background image decompressionA guarantee that the same URL won't be downloaded several timesA guarantee that bogus URLs won't be retried again and againA guarantee that main thread will never be blockedPerformances!Use GCD and ARC

NOTE: The version 3.0 of SDWebImage isn't fully backward compatible with 2.0 and requires iOS 5.0 minimum deployement version. If you need iOS < 5.0 support, please use the last?2.0 version.

How is SDWebImage better than X?

Who Use It

Find out?who use SDWebImage?and add your app to the list.

How To Use

API documentation is available at?http://hackemist.com/SDWebImage/doc/

Using UIImageView+WebCache category with UITableView

Just #import the UIImageView+WebCache.h header, and call the setImageWithURL:placeholderImage: method from the tableView:cellForRowAtIndexPath: UITableViewDataSource method. Everything will be handled for you, from async downloads to caching management.

#import <SDWebImage/UIImageView+WebCache.h>UITableViewCell tableViewUITableView tableView cellForRowAtIndexPathNSIndexPath indexPathNSString MyIdentifier @"MyIdentifier"UITableViewCell cell tableView dequeueReusableCellWithIdentifierMyIdentifiercell nilcell UITableViewCell allocinitWithStyleUITableViewCellStyleDefault                                       MyIdentifierautorelease// Here we use the new provided setImageWithURL: method to load the web image    cellimageView setImageWithURLNSURL URLWithString@"http://www.domain.com/path/to/image.jpg"UIImage imageNamed@"placeholder.png"celltextLabeltext @"My Text"cell
// Here we use the new provided setImageWithURL: method to load the web imagecellimageView setImageWithURLNSURL URLWithString@"http://www.domain.com/path/to/image.jpg"UIImage imageNamed@"placeholder.png"UIImage imageNSError errorSDImageCacheType cacheTypecompletion code here 
SDWebImageManager manager SDWebImageManager sharedManagermanager downloadWithURLimageURL                 0                 NSUInteger receivedSizelong long expectedSize// progression tracking code                 UIImage imageNSError errorSDImageCacheType cacheTypeimage// do something with image                     
SDWebImageDownloadersharedDownloader downloadImageWithURLimageURL                                                    0                                                   NSUInteger receivedSizelong long expectedSize// progression tracking code                                                   UIImage imageNSError errorBOOL finishedimage finished// do something with image                                                       
SDImageCache imageCache SDImageCachealloc initWithNamespace@"myNamespace"imageCache queryDiskCacheForKeymyCacheKey doneUIImage image// image is not nil if image was found
SDImageCache sharedImageCachestoreImagemyImage forKeymyCacheKey
BOOLapplication:UIApplication application didFinishLaunchingWithOptions:NSDictionary launchOptionsSDWebImageManagersharedManagercacheKeyFilterNSURL urlurl NSURL allocinitWithSchemeurlscheme hosturlhost pathurlpathautoreleaseurl absoluteString// Your app init code...    YES
imageView setImageWithURLNSURL URLWithString@"https://graph.facebook.com/olivier.poitrey/picture"UIImage imageNamed@"avatar-placeholder.png"SDWebImageRefreshCached
Add dependencies
In you application project app’s target settings, find the "Build Phases" section and open the "Link Binary With Libraries" block:Click the "+" button again and select the "ImageIO.framework", this is needed by the progressive download feature:
Add Linker Flag
Open the "Build Settings" tab, in the "Linking" section, locate the "Other Linker Flags" setting and add the "-ObjC" flag:
Import headers in your source files
In the source files where you need to use the library, import the header file:
#import <SDWebImage/UIImageView+WebCache.h>
Build Project
At this point your workspace should build without error. If you are having problem, post to the Issue and the community can help you solve it.
Future Enhancements
LRU memory cache cleanup instead of reset on memory warning