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Fix nullability of ASImageDownloaderProtocol to conform to ASBasicImageDownloader behavior

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This commit is contained in:
Adlai Holler 2015-09-17 14:48:42 -07:00
parent 38706d0962
commit ba9a742999
1 changed files with 2 additions and 4 deletions
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6
AsyncDisplayKit/Details/ASImageProtocols.h
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@ -43,13 +43,11 @@ NS_ASSUME_NONNULL_BEGIN
@param completion The block to be invoked when the download has completed, or has failed.
@param image The image that was downloaded, if the image could be successfully downloaded; nil otherwise.
@param error An error describing why the download of `URL` failed, if the download failed; nil otherwise.
@discussion If `URL` is nil, `completion` will be invoked immediately with a nil image and an error describing why the
download failed. This method is likely to be called on the main thread, so any custom implementations should make
sure to background any expensive download operations.
@discussion This method is likely to be called on the main thread, so any custom implementations should make sure to background any expensive download operations.
@result An opaque identifier to be used in canceling the download, via `cancelImageDownloadForIdentifier:`. You must
retain the identifier if you wish to use it later.
*/
- (id)downloadImageWithURL:(nullable NSURL *)URL
- (id)downloadImageWithURL:(NSURL *)URL
callbackQueue:(nullable dispatch_queue_t)callbackQueue
downloadProgressBlock:(void (^ _Nullable)(CGFloat progress))downloadProgressBlock
completion:(void (^ _Nullable)(CGImageRef _Nullable image, NSError * _Nullable error))completion;