SDWebImage/Docs/SDWebImage-5.0-Migration-guide.md

SDWebImage 5.0 Migration Guide

SDWebImage 5.0 is the latest major release of SDWebImage, a top library for downloading and caching images. As a major release, following Semantic Versioning conventions, 5.0 introduces several API-breaking changes with its new architecture.

This guide is provided in order to ease the transition of existing applications using SDWebImage 4.X to the latest APIs, as well as explain the design and structure of new and changed functionality.

Requirements: iOS 8, Mac OS X 10.10, watchOS 2, tvOS 9, Xcode 9

SDWebImage 5.0 officially supports iOS 8 and later, Mac OS X 10.10 and later, watchOS 2 and later and tvOS 9 and later. It needs Xcode 9 or later to be able to build everything properly.

For targeting previous versions of the SDKs, check README - Backwards compatibility.

Migration

Using the view categories brings no change from 4.x to 5.0.

Objective-C:

[imageView sd_setImageWithURL:url placeholderImage:placeholderImage];

Swift:

imageView.sd_setImage(with: url, placeholderImage: placeholder)

However, all view categories in 5.0 introduce a new extra arg called SDWebImageContext. Which can hold anything that previous enum SDWebImageOptions can not. This allow user to control advanced behavior for view loading as well as many aspect. See the declaration for SDWebImageContext for detailed information.

New Features

Animated Image View

In 5.0, we introduce a brand new animated image solution. Which including animated image loading, rendering, decoding, and also support customization for advanced user.

This animated image solution is available for iOS/tvOS/macOS. The SDAnimatedImage is subclass of UIImage/NSImage, and SDAnimatedImageView is subclass of UIImageView/NSImageView, to allow most compatible for common framework APIs. See Animated Image for more detailed information.

Transformer

In 5.0, we introduce a easy way to provide a image transform process after the image was downloaded from network. Which allow user to easily scale, rotate, rounded corner the original image. And even support chain a list of transformers together to output the final one. These transformed image will also stored to cache to avoid duplicate process. See Image Transformer for more detailed information.

Customization

In 5.0, we refactor our framework architecture, to allow it easy to customize for advanced user, without breaking anything or create their fork. We introduce Custom Cache, Custom Loader, and make current Custom Coder works better for these developers.

FLAnimatedImage support moved to a dedicated plugin repo

Since we introduce the new animated image solution. Now we are no longer hosting the integration with FLAnimatedImage inside this repo. But for user who need FLAnimatedImage support. We have a dedicated repo for that and contains all the code compatible for SDWebImage 5.0. See SDWebImageFLPlugin for more detailed information.

Photos Plugin

By taking the advantage of Custom Loader feature, we introduce a plugin to allow easily load Photos Library images. See SDWebImagePhotosPlugin for more detailed information.

API Changes

SDImageCache

• moved maxMemoryCost and maxMemoryCountLimit to SDImageCacheConfig
• makeDiskCachePath: removed, use NSSearchPathForDirectoriesInDomains with NSString's Path API instead.
• addReadOnlyCachePath: removed, use additionalCachePathBlock instead
• cachePathForKey:inPath: removed, use cachePathForKey: with NSString's path API instead.
• defaultCachePathForKey: removed, use cachePathForKey: instead
• SDCacheQueryCompletedBlock renamed to SDImageCacheQueryCompletionBlock
• SDWebImageCheckCacheCompletionBlock renamed to SDImageCacheCheckCompletionBlock
• SDWebImageCalculateSizeBlock renamed to SDImageCacheCalculateSizeBlock

SDImageCacheConfig

• shouldDecompressImages removed. Use SDImageCacheAvoidDecodeImage in cache options instead

SDWebImageManager

• loadImageWithURL:options:progress:completed: changed the completed param requirement from nullable to nonnull
• loadImageWithURL:options:progress:completed: return type id<SDWebImageOperation> changed to SDWebImageCombinedOperation *
• imageCache changed from nullable to nonnull. And property type changed from SDImageCache * to id<SDImageCache>. The default value does not change.
• imageDownloader renamed to imageLoader and changed from nullable to nonnull. And property type changed from SDWebImageDownloader * to id<SDImageLoader>. The default value does not change.
• cacheKeyFilter property type changed to id<SDWebImageCacheKeyFilter>, you can use +[SDWebImageCacheKeyFilter cacheKeyFilterWithBlock:] to create
• cacheSerializer property type changed to id<SDWebImageCacheSerializer>, you can use +[SDWebImageCacheSerializer cacheSerializerWithBlock:] to create
• SDWebImageCacheKeyFilterBlock's url arg change from nullable to nonnull
• initWithCache:downloader: 's cache arg type changed from SDImageCache * to id<SDImageCache>
• initWithCache:downloader renamed to initWithCache:loader:
• saveImageToCache:forURL: removed. Use SDImageCache storeImage:imageData:forKey:cacheType:completion: (or SDImageCache storeImage:forKey:toDisk:completion: if you use default cache class) with cacheKeyForURL: instead.
• diskImageExistsForURL:completion: removed. Use SDImageCache containsImageForKey:cacheType:completion: (or SDImageCache diskImageExistsWithKey:completion: if you use default cache class) with cacheKeyForURL: instead.
• cachedImageExistsForURL:completion removed. Use SDImageCache containsImageForKey:cacheType:completion: (or SDImageCache diskImageExistsWithKey:completion: and SDImageCache imageFromMemoryCacheForKey: if you use default cache class) with cacheKeyForURL: instead.

SDWebImageManagerDelegate

• removed imageManager:transformDownloadedImage:forKey:, use SDImageTransformer with context option instead

UIView and subclasses (UIImageView, UIButton, ...)

• sd_internalSetImageWithURL:placeholderImage:options:operationKey:setImageBlock:progress:completed: renamed to UIView sd_internalSetImageWithURL:placeholderImage:options:context:setImageBlock:progress:completed: (The biggest changes is that the completion block type from SDExternalCompletionBlock to SDInternalCompletionBlock. Which allow advanced user to get more information of image loading process)
• sd_internalSetImageWithURL:placeholderImage:options:operationKey:setImageBlock:progress:completed:context: removed
• activity indicator refactoring - use sd_imageIndicator with SDWebImageActivityIndicator
• sd_setShowActivityIndicatorView: removed
• sd_setIndicatorStyle: removed
• sd_showActivityIndicatorView removed
• sd_addActivityIndicator: removed
• sd_removeActivityIndicator: removed

UIImage

• Renamed isGIF to sd_isAnimated, also NSImage isGIF renamed to NSImage sd_isAnimated
• Renamed decodedImageWithImage: to sd_decodedImageWithImage:
• Renamed decodedAndScaledDownImageWithImage: to sd_decodedAndScaledDownImageWithImage:
• Renamed sd_animatedGIFWithData to sd_imageWithGIFData:
• Removed sd_webpLoopCount

UIImageView

• Removed sd_setImageWithPreviousCachedImageWithURL:placeholderImage:options:progress:completed

SDWebImageDownloader

• shouldDecompressImages moved to SDWebImageDownloaderConfig.shouldDecompressImages
• maxConcurrentDownloads moved to SDWebImageDownloaderConfig.maxConcurrentDownloads
• downloadTimeout moved to SDWebImageDownloaderConfig.downloadTimeout
• operationClass moved to SDWebImageDownloaderConfig.operationClass
• executionOrder moved to SDWebImageDownloaderConfig.executionOrder
• urlCredential moved to SDWebImageDownloaderConfig.urlCredential
• username moved to SDWebImageDownloaderConfig.username
• password moved to SDWebImageDownloaderConfig.password
• initWithSessionConfiguration: removed, use initWithConfig: with session configuration instead
• createNewSessionWithConfiguration: removed, use initWithConfig: with new session configuration instead. To modify shared downloader configuration, provide custom SDWebImageDownloaderConfig.defaultDownloaderConfig before it created.
• headersFilter removed, use requestModifier instead
• cancel: removed, use -[SDWebImageDownloadToken cancel] instead
• shouldDecompressImages removed. Use SDWebImageDownloaderAvoidDecodeImage in downloader options instead
• use SDWebImageLoaderProgressBlock instead of SDWebImageDownloaderProgressBlock
• use SDWebImageLoaderCompletedBlock instead of SDWebImageDownloaderCompletedBlock

SDWebImageDownloaderOperation

• initWithRequest:inSession:options:context: is now the designated initializer
• Removed shouldUseCredentialStorage property
• SDWebImageDownloadOperationInterface protocol renamed to SDWebImageDownloadOperation
• expectedSize removed, use response.expectedContentLength instead
• shouldDecompressImages removed. Use SDWebImageDownloaderAvoidDecodeImage in downloader options instead.
• response property change to readonly

SDWebImagePrefetcher

• prefetchURLs: and prefetchURLs:progress:completed: return types changed from void to SDWebImagePrefetchToken
• prefetcherQueue property renamed to delegateQueue
• maxConcurrentDownloads property removed, use SDWebImageManager.downloader config instead

SDImageCoder

• SDCGColorSpaceGetDeviceRGB() moved to +[SDImageCoderHelper colorSpaceGetDeviceRGB]
• SDCGImageRefContainsAlpha(), moved to +[SDImageCoderHelper imageRefContainsAlpha:]
• decodedImageWithData: replaced with decodedImageWithData:options:
• encodedDataWithImage:format: replaced with encodedDataWithImage:format:options
• init method from SDWebImageProgressiveCoder changed to initIncrementalWithOptions:
• incrementalDecodedImageWithData:finished replaced with updateIncrementalData:finished and incrementalDecodedImageWithOptions: two APIs
• removed decompressedImage:data:options, use +[SDImageCoderHelper decodedImageWithImage:] and +[SDImageCoderHelper decodedAndScaledDownImageWithImage:limitBytes:] instead

Constants

• SDWebImageInternalSetImageGroupKey renamed to SDWebImageContextSetImageGroup
• SDWebImageExternalCustomManagerKey renamed to SDWebImageContextCustomManager

Swift Specific API Changes

We did a full cleanup of the Swift APIs. We are using many modern Objective-C declarations to generate the Swift API. We now provide full nullability support, string enum, class property, and even custom Swift API name, all to make the framework easier to use for our Swift users. Here are the API change specify for Swift.

UIView+WebCache

• sd_imageURL() changed to sd_imageURL

SDWebImageManager

• shared() changed to shared
• isRunning() changed to isRunning

SDWebImageDownloader

• shared() changed to shared
• setOperationClass(_:) available for Swift user with operationClass property
• setSuspended(_:) changed to isSuspended property

SDWebImageDownloadOperation

• SDWebImageDownloadOperationInterface protocol renamed to SDWebImageDownloadOperationProtocol.

SDImageCodersManager

• sharedInstance() changed to shared

SDImageIOCoder

• shared() changed to shared

SDImageGIFCoder

• shared() changed to shared

SDImageWebPCoder

• shared() changed to shared

NSData-ImageContentType

• sd_UTTypeFromSDImageFormat return CFString instead of Unmanaged<CFString>

UIButton-WebCache

• sd_currentImageURL() changed to sd_currentImageURL

NSButton-WebCache

• sd_currentImageURL() changed to sd_currentImageURL
• sd_currentAlternateImageURL() changed to sd_currentAlternateImageURL

Full API Diff

For advanced user who need the detailed API diff, we provide the full diff in a HTML web page: SDWebImage 5.0 API Diff