I tested many devices and the results are as follows:

I recorded a video, but I found that the video cannot be uploaded. This is my test code: UIImage *i = [UIImage imageNamed:@"temp"]; NSLog(@"%@", i); UIImageView *v = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"temp"]]; [self.view addSubview:v]; v.frame = CGRectMake(50, 150, 300, 200); iPhone 8 plus, iOS 12.1.1 output: 2024-10-21 11:05:36.699573+0800 temp-02[1226:204265] (null) other devices outputs: <UIImage:0x600003014120 named(main: temp) {132.66666666666666, 122} renderingMode=automatic(original)>

In the Xcode project, first decode PNG images and then re encode them into heic images, which can be successfully displayed on iPhone 8 plus and iOS 12.1.2; Is it a problem with the Mac conversion tool or other issues? Is there a better conversion compatibility solution for PNG to heic? thank you. The conversion code is as follows: - (void)test3{ NSString *url = [[NSBundle mainBundle] pathForResource:@"1-m" ofType:@"png"]; CGImageRef ref = createCGImageFromFile(url); NSString *path_document = NSHomeDirectory(); NSString *imagePath = [path_document stringByAppendingString:@"/Documents/pic.heic"]; [self generateNewHEIC:[UIImage imageWithCGImage:ref] savePath:imagePath]; dispatch_async(dispatch_get_main_queue(), ^{ UIImage *i = [[UIImage alloc] initWithContentsOfFile:imagePath]; NSLog(@"%@", i); UIImageView *v = [[UIImageView alloc] initWithImage:i]; [self.view addSubview:v]; v.frame = CGRectMake(50, 150, 300, 200); }); CFRelease(ref); } /// create CGImageRef /// - Parameter path: main bundle CGImageRef createCGImageFromFile (NSString* path) { // Get the URL for the pathname passed to the function. NSURL *url = [NSURL fileURLWithPath:path]; CGImageRef myImage = NULL; CGImageSourceRef myImageSource; CFDictionaryRef myOptions = NULL; CFStringRef myKeys[2]; CFTypeRef myValues[2]; // Set up options if you want them. The options here are for // caching the image in a decoded form and for using floating-point // values if the image format supports them. myKeys[0] = kCGImageSourceShouldCache; myValues[0] = (CFTypeRef)kCFBooleanTrue; myKeys[1] = kCGImageSourceShouldAllowFloat; myValues[1] = (CFTypeRef)kCFBooleanTrue; // Create the dictionary myOptions = CFDictionaryCreate(NULL, (const void **) myKeys, (const void **) myValues, 2, &kCFTypeDictionaryKeyCallBacks, & kCFTypeDictionaryValueCallBacks); // Create an image source from the URL. myImageSource = CGImageSourceCreateWithURL((CFURLRef)url, myOptions); CFRelease(myOptions); // Make sure the image source exists before continuing if (myImageSource == NULL){ fprintf(stderr, "Image source is NULL."); return NULL; } // Create an image from the first item in the image source. myImage = CGImageSourceCreateImageAtIndex(myImageSource, 0, NULL); CFRelease(myImageSource); // Make sure the image exists before continuing if (myImage == NULL){ fprintf(stderr, "Image not created from image source."); return NULL; } return myImage; } /// /// - Parameters: /// - image: <#image description#> /// - path: <#path description#> - (void)generateNewHEIC:(UIImage *)image savePath:(NSString *)path{ NSMutableData *imageData = [NSMutableData data]; // HEIC CFStringRef imageUTType = CFSTR("public.heic"); CGImageDestinationRef destination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, imageUTType, 1, NULL); if (!destination) { return; } CGImageRef imageRef = image.CGImage; CGImagePropertyOrientation exifOrientation = kCGImagePropertyOrientationDown; NSMutableDictionary *frameProperties = [NSMutableDictionary dictionary]; // imageProperties[(__bridge_transfer NSString *) kCGImagePropertyExifDictionary] = @(exifOrientation); CGImageDestinationAddImage(destination, imageRef, (__bridge CFDictionaryRef)frameProperties); if (CGImageDestinationFinalize(destination) == NO) { imageData = nil; } CFRelease(destination); if(imageData) { NSURL *url = [NSURL fileURLWithPath:path]; [imageData writeToURL:url atomically:YES]; } }