It’s probably getting the same image from within the bundle based on the path.
> On Sep 22, 2020, at 8:12 PM, Eric Lee via Cocoa-dev > <cocoa-dev@lists.apple.com> wrote: > > 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/zav%40mac.com > > This email sent to z...@mac.com _______________________________________________ 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
