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92 lines
2.8 KiB
Objective-C
92 lines
2.8 KiB
Objective-C
/* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <AsyncDisplayKit/ASImageNode.h>
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#import <AsyncDisplayKit/ASImageProtocols.h>
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@protocol ASNetworkImageNodeDelegate;
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/**
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* ASNetworkImageNode is a simple image node that can download and display an image from the network, with support for a
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* placeholder image (<defaultImage>). The currently-displayed image is always available in the inherited ASImageNode
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* <image> property.
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*
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* @see ASMultiplexImageNode for a more powerful counterpart to this class.
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*/
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@interface ASNetworkImageNode : ASImageNode
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/**
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* The designated initializer.
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*
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* @param cache The object that implements a cache of images for the image node.
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* @param downloader The object that implements image downloading for the image node. Must not be nil.
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*
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* @discussion If `cache` is nil, the receiver will not attempt to retrieve images from a cache before downloading them.
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*
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* @result An initialized ASNetworkImageNode.
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*/
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- (instancetype)initWithCache:(id<ASImageCacheProtocol>)cache downloader:(id<ASImageDownloaderProtocol>)downloader;
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- (instancetype)init NS_UNAVAILABLE;
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/**
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* The delegate, which must conform to the <ASNetworkImageNodeDelegate> protocol.
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*/
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@property (atomic, weak, readwrite) id<ASNetworkImageNodeDelegate> delegate;
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/**
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* A placeholder image to display while the URL is loading.
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*/
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@property (atomic, strong, readwrite) UIImage *defaultImage;
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/**
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* The URL of a new image to download and display.
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*
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* @discussion Changing this property will reset the displayed image to a placeholder (<defaultImage>) while loading.
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*/
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@property (atomic, strong, readwrite) NSURL *URL;
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/**
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* Download and display a new image.
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*
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* @param reset Whether to display a placeholder (<defaultImage>) while loading the new image.
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*/
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- (void)setURL:(NSURL *)URL resetToDefault:(BOOL)reset;
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/**
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* If <URL> is a local file, set this property to YES to take advantage of UIKit's image cacheing. Defaults to YES.
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*/
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@property (nonatomic, assign, readwrite) BOOL shouldCacheImage;
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@end
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#pragma mark -
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@protocol ASNetworkImageNodeDelegate <NSObject>
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/**
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* Notification that the image node finished downloading an image.
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*
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* @param imageNode The sender.
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* @param image The newly-loaded image.
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*
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* @discussion Called on a background queue.
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*/
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- (void)imageNode:(ASNetworkImageNode *)imageNode didLoadImage:(UIImage *)image;
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@optional
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/**
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* Notification that the image node finished decoding an image.
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*
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* @param imageNode The sender.
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*/
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- (void)imageNodeDidFinishDecoding:(ASNetworkImageNode *)imageNode;
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@end
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