4
我正嘗試使用地理標籤信息更新UIImage
。我看着Saving Geotag info with photo on iOS4.1,這是我找到了對NSMutableDDictionary+ImageMetadata category的引用。不過,我不想保存到相冊中,但有一個UIImage
傳遞。使用EXIF /地理標籤信息更新內存中的iOS UIImage
下面的代碼看起來像是製作了太多的圖像副本,並要求鏈接所有這些框架:CoreImage,AssetsLibrary,CoreMedia,ImageIO。
有什麼更高效,UIImage
- >CIImage
- >CGImage
- >UIImage
,可以採取的NSDictionary需要設置EXIF數據的屬性?
- (UIImage *)updateImage:(UIImage *)image location:(CLLocation *)location dateOriginal:(NSDate *)dateOriginal
{
NSMutableDictionary *properties = [NSMutableDictionary dictionaryWithDictionary:[image.CIImage properties]];
// uses https://github.com/gpambrozio/GusUtils
[properties setLocation:location];
[properties setDateOriginal:dateOriginal];
CIImage *tempImage = [[CIImage alloc] initWithImage:image options:properties];
CIContext *context = [CIContext contextWithOptions:nil];
UIImage *updatedImage = [UIImage imageWithCGImage:[context createCGImage:tempImage fromRect:tempImage.extent]];
return updatedImage;
}