Ah maybe it is the use of `imageNamed:`. I believe that caches the image data in a system cache. Have you tried `imageWithContentsOfFile:`?
https://developer.apple.com/documentation/uikit/uiimage/1624123-imagewithcontentsoffile > On Sep 22, 2020, at 16:56, Carl Hoefs <newsli...@autonomy.caltech.edu> wrote: > > >> On Sep 22, 2020, at 1:46 PM, Eric Lee via Cocoa-dev >> <cocoa-dev@lists.apple.com> wrote: >> >>> I don't have a good answer, but I think this may be more that UIImage >>> caches the images, not UIImageView. Maybe you can find something in >>> UIImage's docs/headers? >> >> I think you may be on to something. This WWDC >> <https://developer.apple.com/videos/play/wwdc2018/219> session covers >> optimizing UIImage performance and has some info on what UIImage caches. >> >> How are you creating the UIImage? Are you retaining the UIImage anywhere >> outside of the UIImageView? > > > The path of UIImage creation is as follows: > > - For each manually-initiated processing pass of the app, a standard set of > 12 JPG files is written to the sandbox using the OpenCV::imwrite() function, > which creates a JPG from data values. The files have fixed filenames. > > - When all 12 JPG files for a pass are written, I then use the following code > snippet to create the UIImages and display them on the main UIImageView: > > NSMutableArray *uiImagesArray = [NSMutableArray new]; > for (NSString *file in [[NSFileManager defaultManager] > contentsOfDirectoryAtPath:self.sandboxPath error:NULL]) { > if ([file.pathExtension isEqualToString:@"jpg"]) { > UIImage *tempImage = [UIImage imageNamed:jpgFilename]; > if (tempImage) [uiImagesArray addObject:tempImage]; > } > } > UIImage *allAGFAImages = [UIImage animatedImageWithImages:uiImagesArray > duration:20.0]; > self.imageView.image = allAGFAImages; > > - When a new pass of the app is run, the sandbox contents are deleted (see > below), the uiImagesArray variable is set to nil, and the new JPG files are > written, using the same filenames as before. Note that I do not set each > UIImage in the array explicitly to nil. > > [[NSFileManager defaultManager] removeItemAtURL:[NSURL > fileURLWithPath:[self.sandboxPath stringByAppendingPathComponent:file]] > error:&error]; > > - If I add a uniquing string to the filenames for each pass, the problem does > not present itself. Otherwise the original (old) cached image contents are > displayed until the app is restarted. > > - I don't retain the UIImages anywhere other than adding them to the array in > the code snippet above. > > -Carl > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
