Question

爵士在这里我需要从元数据添加地理位置到uiimage但是添加后我只加载到photoalbum但是在这里我需要那个图像，这里我添加了源代码

- (void) saveImage:(UIImage *)imageToSave withInfo:(NSDictionary *)info
{
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];


        // Get the image metadata (EXIF & TIFF)    
    NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
    [defaults objectForKey:latkey];
    float longitude=[defaults floatForKey:longkey];
    float latitude=[defaults floatForKey:latkey];    
    CLLocation * loc=[[CLLocation alloc] initWithLatitude:latitude longitude:longitude];
    NSMutableDictionary *metaDict = nil;
    if ([info objectForKey:UIImagePickerControllerOriginalImage] != nil) {
        metaDict = [NSMutableDictionary dictionaryWithDictionary:[info objectForKey:UIImagePickerControllerMediaMetadata]];
        NSDictionary *gpsDict = [self currentLocation:loc];
        if ([gpsDict count] > 0) {
            [metaDict setObject:gpsDict forKey:(NSString*)kCGImagePropertyGPSDictionary];
        }
    }
    [library writeImageToSavedPhotosAlbum:[imageToSave CGImage] metadata:metaDict completionBlock:^(NSURL *newURL, NSError *error) {
        if (error) {

        } else {
        }
    }];

    NSLog(@"metaDict  :%@",metaDict);


    NSURL *referenceURL = [info objectForKey:UIImagePickerControllerReferenceURL];
    [library assetForURL:referenceURL resultBlock:^(ALAsset *asset) {
        ALAssetRepresentation *rep = [asset defaultRepresentation];
        NSDictionary *metadata = rep.metadata;
        NSLog(@"%@", metadata);

        CGImageRef iref = [rep fullScreenImage] ;

        if (iref) {
            capturedImage.image = [UIImage imageWithCGImage:iref];
        }
    } failureBlock:^(NSError *error) {
            // error handling
    }];
}

为当前地理位置创建EXIF字段。

- (NSMutableDictionary*)currentLocation:(CLLocation *)location{
    NSMutableDictionary *locDict = [[NSMutableDictionary alloc] init];

    if (location != nil) {
        CLLocationDegrees exifLatitude = location.coordinate.latitude;
        CLLocationDegrees exifLongitude = location.coordinate.longitude;

        [locDict setObject:location.timestamp forKey:(NSString*)kCGImagePropertyGPSTimeStamp];

        if (exifLatitude < 0.0) {
            exifLatitude = exifLatitude*(-1);
            [locDict setObject:@"S" forKey:(NSString*)kCGImagePropertyGPSLatitudeRef];
        } else {
            [locDict setObject:@"N" forKey:(NSString*)kCGImagePropertyGPSLatitudeRef];
        }
        [locDict setObject:[NSNumber numberWithFloat:exifLatitude] forKey:(NSString*)kCGImagePropertyGPSLatitude];

        if (exifLongitude < 0.0) {
            exifLongitude=exifLongitude*(-1);
            [locDict setObject:@"W" forKey:(NSString*)kCGImagePropertyGPSLongitudeRef];
        } else {
            [locDict setObject:@"E" forKey:(NSString*)kCGImagePropertyGPSLongitudeRef];
        }
        [locDict setObject:[NSNumber numberWithFloat:exifLongitude] forKey:(NSString*) kCGImagePropertyGPSLongitude];
    }

    return [locDict autorelease];
}

请帮帮我

Answer 1

编辑：您可以通过关注this链接在相册中添加图片。

现在，如果你有资产，那么使用资产的创建日期你可以知道在添加到相册之前添加的最后一张照片作为保存日期：

NSDate *imgCreateddate = [asset valueForProperty:ALAssetPropertyDate];
if(imgCreateddate isGreaterThan savedDate)
{
  last Photo;
}

参考Adding metadata to iOS images the easy way链接。

请参阅GusUtils了解示例代码。

参考saving-geotag-info-with-photo链接

ios-在uiimage元数据中添加gelocation

1 个答案: