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#1697 (clean scroll stutter on iPhone)

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- Heaviest activity was scaling story thumbnails on the main thread; moved to a background thread.
- No more heavy activity when scrolling shown in Instruments.
This commit is contained in:
David Sinclair 2022-07-22 21:33:37 -07:00 • committed by Samuel Clay
parent 5e0d037db5
commit fe1e81ef90
1 changed files with 20 additions and 15 deletions
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35
clients/ios/Classes/FeedDetailObjCViewController.m
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@ -709,20 +709,25 @@ typedef NS_ENUM(NSUInteger, MarkReadShowMenu)
for (NSString *storyImageUrl in storyImageUrls) {
// NSLog(@"Fetching image: %@", storyImageUrl);
[manager GET:storyImageUrl parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
UIImage *image = (UIImage *)responseObject;
if (!image || image.size.height < 50 || image.size.width < 50) {
[self.appDelegate.cachedStoryImages setObject:[NSNull null]
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0ul);
dispatch_async(queue, ^{
UIImage *image = (UIImage *)responseObject;
if (!image || image.size.height < 50 || image.size.width < 50) {
[self.appDelegate.cachedStoryImages setObject:[NSNull null]
forKey:storyImageUrl];
return;
}
CGSize maxImageSize = CGSizeMake(300, 300);
image = [image imageByScalingAndCroppingForSize:maxImageSize];
[self.appDelegate.cachedStoryImages setObject:image
forKey:storyImageUrl];
return;
}
CGSize maxImageSize = CGSizeMake(300, 300);
image = [image imageByScalingAndCroppingForSize:maxImageSize];
[self.appDelegate.cachedStoryImages setObject:image
forKey:storyImageUrl];
[self.appDelegate.feedDetailViewController
showStoryImage:storyImageUrl];
dispatch_async(dispatch_get_main_queue(), ^{
[self.appDelegate.feedDetailViewController
showStoryImage:storyImageUrl];
});
});
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
}];
@ -1328,9 +1333,9 @@ typedef NS_ENUM(NSUInteger, MarkReadShowMenu)
stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]];
}
}
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0ul);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.1 * NSEC_PER_SEC),
dispatch_get_main_queue(), ^(void) {
queue, ^(void) {
[self cacheStoryImages:storyImageUrls];
});