iphone - UIImageメタデータ

Question

私のアプリでは、アセットライブラリからUIImageを取得していますが、この画像にはメタデータが含まれています。次に、アプリは画像のサイズ変更と回転を行い、それによって新しい画像が作成されます。新しい画像には期待される元のメタデータがありませんが、アップロードする前にメタデータを画像に追加するにはどうすればよいですか？

前もって感謝します！

Answer 1

自分で修正しました。これは、他の誰かがそれを行う方法を考えている場合に備えて使用した方法です。:)

-(UIImage *)addMetaData:(UIImage *)image {

    NSData *jpeg = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0)];

    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)jpeg, NULL);

    NSDictionary *metadata = [[asset_ defaultRepresentation] metadata];

    NSMutableDictionary *metadataAsMutable = [metadata mutableCopy];

    NSMutableDictionary *EXIFDictionary = [metadataAsMutable objectForKey:(NSString *)kCGImagePropertyExifDictionary];
    NSMutableDictionary *GPSDictionary = [metadataAsMutable objectForKey:(NSString *)kCGImagePropertyGPSDictionary];
    NSMutableDictionary *TIFFDictionary = [metadataAsMutable objectForKey:(NSString *)kCGImagePropertyTIFFDictionary];
    NSMutableDictionary *RAWDictionary = [metadataAsMutable objectForKey:(NSString *)kCGImagePropertyRawDictionary];
    NSMutableDictionary *JPEGDictionary = [metadataAsMutable objectForKey:(NSString *)kCGImagePropertyJFIFDictionary];
    NSMutableDictionary *GIFDictionary = [metadataAsMutable objectForKey:(NSString *)kCGImagePropertyGIFDictionary];

    if(!EXIFDictionary) {
        EXIFDictionary = [NSMutableDictionary dictionary];
    }

    if(!GPSDictionary) {
        GPSDictionary = [NSMutableDictionary dictionary];
    }

    if (!TIFFDictionary) {
        TIFFDictionary = [NSMutableDictionary dictionary];
    }

    if (!RAWDictionary) {
        RAWDictionary = [NSMutableDictionary dictionary];
    }

    if (!JPEGDictionary) {
        JPEGDictionary = [NSMutableDictionary dictionary];
    }

    if (!GIFDictionary) {
        GIFDictionary = [NSMutableDictionary dictionary];
    }

    [metadataAsMutable setObject:EXIFDictionary forKey:(NSString *)kCGImagePropertyExifDictionary];
    [metadataAsMutable setObject:GPSDictionary forKey:(NSString *)kCGImagePropertyGPSDictionary];
    [metadataAsMutable setObject:TIFFDictionary forKey:(NSString *)kCGImagePropertyTIFFDictionary];
    [metadataAsMutable setObject:RAWDictionary forKey:(NSString *)kCGImagePropertyRawDictionary];
    [metadataAsMutable setObject:JPEGDictionary forKey:(NSString *)kCGImagePropertyJFIFDictionary];
    [metadataAsMutable setObject:GIFDictionary forKey:(NSString *)kCGImagePropertyGIFDictionary];

    CFStringRef UTI = CGImageSourceGetType(source);

    NSMutableData *dest_data = [NSMutableData data];

    CGImageDestinationRef destination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)dest_data,UTI,1,NULL);

    //CGImageDestinationRef hello;

    CGImageDestinationAddImageFromSource(destination,source,0, (__bridge CFDictionaryRef) metadataAsMutable);

    BOOL success = NO;
    success = CGImageDestinationFinalize(destination);

    if(!success) {
    }

    dataToUpload_ = dest_data;

    CFRelease(destination);
    CFRelease(source);

    return image;
}