Jak zapisywać metadane exif do obrazu (nie rolki aparatu, tylko UIImage lub JPEG)

Używam UIImagePickerController, aby uzyskać obraz z kamery i mój przepływ jest nieco inny niż ten opisany przez Chiquis. Tutaj jest:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *image = info[@"UIImagePickerControllerOriginalImage"];
    NSString *fullPhotoFilename = ...; // generate the photo name and path here
    NSData *photoData = [UIImage taggedImageData:image.jpegData metadata:info[@"UIImagePickerControllerMediaMetadata"] orientation:image.imageOrientation];
    [photoData writeToFile:fullPhotoFilename atomically:YES];
}

I za pomocą kategorii UIImage umieścić połączenie danych obrazu z metadanymi:

#import <ImageIO/ImageIO.h>
#import "UIImage+Tagging.h"
#import "LocationHelper.h"

@implementation UIImage (Tagging)

+ (NSData *)writeMetadataIntoImageData:(NSData *)imageData metadata:(NSMutableDictionary *)metadata {
    // create an imagesourceref
    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef) imageData, NULL);

    // this is the type of image (e.g., public.jpeg)
    CFStringRef UTI = CGImageSourceGetType(source);

    // create a new data object and write the new image into it
    NSMutableData *dest_data = [NSMutableData data];
    CGImageDestinationRef destination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)dest_data, UTI, 1, NULL);
    if (!destination) {
        NSLog(@"Error: Could not create image destination");
    }
    // add the image contained in the image source to the destination, overidding the old metadata with our modified metadata
    CGImageDestinationAddImageFromSource(destination, source, 0, (__bridge CFDictionaryRef) metadata);
    BOOL success = NO;
    success = CGImageDestinationFinalize(destination);
    if (!success) {
        NSLog(@"Error: Could not create data from image destination");
    }
    CFRelease(destination);
    CFRelease(source);
    return dest_data;
}

+ (NSData *)taggedImageData:(NSData *)imageData metadata:(NSDictionary *)metadata orientation:(UIImageOrientation)orientation {
    CLLocationManager *locationManager = [CLLocationManager new];
    CLLocation *location = [locationManager location];
    NSMutableDictionary *newMetadata = [NSMutableDictionary dictionaryWithDictionary:metadata];
    if (!newMetadata[(NSString *)kCGImagePropertyGPSDictionary] && location) {
        newMetadata[(NSString *)kCGImagePropertyGPSDictionary] = [LocationHelper gpsDictionaryForLocation:location];
    }

    // Reference: http://sylvana.net/jpegcrop/exif_orientation.html
    int newOrientation;
    switch (orientation) {
        case UIImageOrientationUp:
            newOrientation = 1;
            break;

        case UIImageOrientationDown:
            newOrientation = 3;
            break;

        case UIImageOrientationLeft:
            newOrientation = 8;
            break;

        case UIImageOrientationRight:
            newOrientation = 6;
            break;

        case UIImageOrientationUpMirrored:
            newOrientation = 2;
            break;

        case UIImageOrientationDownMirrored:
            newOrientation = 4;
            break;

        case UIImageOrientationLeftMirrored:
            newOrientation = 5;
            break;

        case UIImageOrientationRightMirrored:
            newOrientation = 7;
            break;

        default:
            newOrientation = -1;
    }
    if (newOrientation != -1) {
        newMetadata[(NSString *)kCGImagePropertyOrientation] = @(newOrientation);
    }
    NSData *newImageData = [self writeMetadataIntoImageData:imageData metadata:newMetadata];
    return newImageData;
}

I na koniec, oto metoda, której używam do generowania potrzebnego słownika GPS:

+ (NSDictionary *)gpsDictionaryForLocation:(CLLocation *)location {
    NSTimeZone      *timeZone   = [NSTimeZone timeZoneWithName:@"UTC"];
    NSDateFormatter *formatter  = [[NSDateFormatter alloc] init];
    [formatter setTimeZone:timeZone];
    [formatter setDateFormat:@"HH:mm:ss.SS"];

    NSDictionary *gpsDict = @{(NSString *)kCGImagePropertyGPSLatitude: @(fabs(location.coordinate.latitude)),
                          (NSString *)kCGImagePropertyGPSLatitudeRef: ((location.coordinate.latitude >= 0) ? @"N" : @"S"),
                          (NSString *)kCGImagePropertyGPSLongitude: @(fabs(location.coordinate.longitude)),
                          (NSString *)kCGImagePropertyGPSLongitudeRef: ((location.coordinate.longitude >= 0) ? @"E" : @"W"),
                          (NSString *)kCGImagePropertyGPSTimeStamp: [formatter stringFromDate:[location timestamp]],
                          (NSString *)kCGImagePropertyGPSAltitude: @(fabs(location.altitude)),
                          };
    return gpsDict;
}

Jest łatwiejszy sposób. Jeśli chcesz zapisać jakiś exif, możesz użyć SimpleExif pod

Najpierw Utwórz ExifContainer:

ExifContainer *container = [[ExifContainer alloc] init];

I wypełnić go wszystkimi wymaganymi danymi:

[container addUserComment:@"A long time ago, in a galaxy far, far away"];
[container addCreationDate:[NSDate dateWithTimeIntervalSinceNow:-10000000]];
[container addLocation:locations[0]];

Następnie możesz dodać te dane do obrazu:

NSData *imageData = [[UIImage imageNamed:@"DemoImage"] addExif:container];

Następnie po prostu zapisz te dane jako JPEG

Spotkałem się z tym samym problemem, teraz mogę przesłać pliki z danymi EXIF, możesz również skompresować zdjęcie, jeśli zajdzie taka potrzeba, to rozwiązało problem dla mnie:

// Get your image.
UIImage *loImgPhoto = [self getImageFromAsset:loPHAsset];

// Get your metadata (includes the EXIF data).
CGImageSourceRef loImageOriginalSource = CGImageSourceCreateWithData(( CFDataRef) loDataFotoOriginal, NULL);
NSDictionary *loDicMetadata = (__bridge NSDictionary *) CGImageSourceCopyPropertiesAtIndex(loImageOriginalSource, 0, NULL);

// Set your compression quality (0.0 to 1.0).
NSMutableDictionary *loDicMutableMetadata = [loDicMetadata mutableCopy];
[loDicMutableMetadata setObject:@(lfCompressionQualityValue) forKey:(__bridge NSString *)kCGImageDestinationLossyCompressionQuality];

// Create an image destination.
NSMutableData *loNewImageDataWithExif = [NSMutableData data];
CGImageDestinationRef loImgDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)loNewImageDataWithExif, CGImageSourceGetType(loImageOriginalSource), 1, NULL);


// Add your image to the destination.
CGImageDestinationAddImage(loImgDestination, loImgPhoto.CGImage, (__bridge CFDictionaryRef) loDicMutableMetadata);

// Finalize the destination.
if (CGImageDestinationFinalize(loImgDestination))
   {
       NSLog(@"Successful image creation.");                   
       // process the image rendering, adjustment data creation and finalize the asset edit.


       //Upload photo with EXIF metadata
       [self myUploadMethod:loNewImageDataWithExif];

    }
    else
    {
          NSLog(@"Error -> failed to finalize the image.");                         
    }

CFRelease(loImageOriginalSource);
CFRelease(loImgDestination);

getImageFromAsset "metoda": {]}

-(UIImage *)getImageFromAsset:(PHAsset *)aPHAsset

{
    __block  UIImage *limgImageResult;

    PHImageRequestOptions *lPHImageRequestOptions = [PHImageRequestOptions new];
    lPHImageRequestOptions.synchronous = YES;

    [self.imageManager requestImageForAsset:aPHAsset
                                 targetSize:PHImageManagerMaximumSize
                                contentMode:PHImageContentModeDefault//PHImageContentModeAspectFit
                                    options:lPHImageRequestOptions
                              resultHandler:^(UIImage *limgImage, NSDictionary *info) {

                                  limgImageResult = limgImage;
                              }];


    return limgImageResult;
}

Oto podstawy ustawiania metadanych marki i modelu na pliku .jpg W Swift 3 https://gist.github.com/lacyrhoades/09d8a367125b6225df5038aec68ed9e7 wersje wyższego poziomu, jak używanie exifcontainer pod, nie działały dla mnie.