On my Mac laptop, select the image and then choose Quick Actions ->Convert Image ->HEIF ->Convert to HEIF. It has nothing to do with the size of the images. I tested three images (4kb, 40kb, 743kb), but none of them could be displayed. "image information" ： When I use the following code, the value of img returns nil, but if loading PNG images, img return normal obj. """ UIImage *img = [UIImage imageNamed:@"xxx"]; """

Compile asset catalogs : ../actool --output-format human-readable-text --notices --warnings --export-dependency-info /..._dependencies --output-partial-info-plist /..._info.plist --app-icon AppIcon --accent-color AccentColor --compress-pngs --enable-on-demand-resources YES --filter-for-thinning-device-configuration iPhone10,2 --filter-for-device-os-version 12.1.2 --development-region en --target-device iphone --target-device ipad --minimum-deployment-target 12.0 --platform iphoneos --compile ...

--filter-for-thinning-device-configuration iPhone10,2 --filter-for-device-os-version 12.1.2 it looks does not work.

I'm using ObjC and have tried AppDelegate and SceneDelegate, but neither worked.