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Expose the associate FLAnimatedImage to user for advanced usage. Update the comments

This commit is contained in:
DreamPiggy 2018-01-27 14:47:43 +08:00
parent 1749666720
commit 14d83fff5b
2 changed files with 37 additions and 32 deletions
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12
SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.h
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@ -18,6 +18,18 @@
#import "SDWebImageManager.h"
/**
* FLAnimatedImage is not a subclass of UIImage, so it's not possible to store it into the memory cache currently. However, for performance issue and cell reuse on FLAnimatedImageView, we use associate object to bind a FLAnimatedImage into UIImage when an animated GIF image load. For most cases, you don't need to touch this.
*/
@interface UIImage (FLAnimatedImage)
/**
* The FLAnimatedImage associated to the UIImage instance when an animated GIF image load.
*/
@property (nonatomic, strong, readonly, nullable) FLAnimatedImage *sd_FLAnimatedImage;
@end
/**
* A category for the FLAnimatedImage imageView class that hooks it to the SDWebImage system.

17
SDWebImage/FLAnimatedImage/FLAnimatedImageView+WebCache.m
View File

@ -15,12 +15,6 @@
#import "NSData+ImageContentType.h"
#import "UIImageView+WebCache.h"
@interface UIImage (FLAnimatedImage)
@property (nonatomic, strong) FLAnimatedImage *sd_FLAnimatedImage;
@end
@implementation UIImage (FLAnimatedImage)
- (FLAnimatedImage *)sd_FLAnimatedImage {
@ -71,24 +65,23 @@
options:options
operationKey:nil
setImageBlock:^(UIImage *image, NSData *imageData) {
SDImageFormat imageFormat = [NSData sd_imageFormatForImageData:imageData];
// We could not directlly create the animated image on bacakground queue because it's time consuming, by the time we set it back, the current runloop has passed and the placeholder has been rendered and then replaced with animated image, this cause a flashing.
// Previously we use a trick to firstly set the static poster image, then set animated image back to avoid flashing, but this trick fail when using with UIView transition because it's based on the Core Animation. Core Animation will capture the current layer state to do rendering, so even we later set it back, the transition will not update. (it's recommended to use `SDWebImageTransition` instead)
// Previously we use a trick to firstly set the static poster image, then set animated image back to avoid flashing, but this trick fail when using with custom UIView transition. Core Animation will use the current layer state to do rendering, so even we later set it back, the transition will not update. (it's recommended to use `SDWebImageTransition` instead)
// So we have no choice to force store the FLAnimatedImage into memory cache using a associated object binding to UIImage instance. This consumed memory is adoptable and much smaller than `_UIAnimatedImage` for big GIF
FLAnimatedImage *associatedAnimatedImage = image.sd_FLAnimatedImage;
if (associatedAnimatedImage || imageFormat == SDImageFormatGIF) {
if (associatedAnimatedImage) {
// Asscociated animated image exist
weakSelf.animatedImage = associatedAnimatedImage;
weakSelf.image = nil;
if (group) {
dispatch_group_leave(group);
}
} else {
} else if ([NSData sd_imageFormatForImageData:imageData] == SDImageFormatGIF) {
// Firstly set the static poster image to avoid flashing
UIImage *posterImage = image.images ? image.images.firstObject : image;
weakSelf.image = posterImage;
weakSelf.animatedImage = nil;
// The imageData should not be nil, create FLAnimatedImage in global queue because it's time consuming, then set it back
// Secondly create FLAnimatedImage in global queue because it's time consuming, then set it back
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
FLAnimatedImage *animatedImage = [FLAnimatedImage animatedImageWithGIFData:imageData];
dispatch_async(dispatch_get_main_queue(), ^{
@ -100,8 +93,8 @@
}
});
});
}
} else {
// Not animated image
weakSelf.image = image;
weakSelf.animatedImage = nil;
if (group) {