問題設置圖像的exif數據我在iOS 4.1中使用新的ImageIO框架。我使用以下代碼成功檢索exif元數據：CFDictionaryRef metadataDict = CMGetAttachment(sampleBuffer, kCGImagePropertyExifDictionary , NULL);閱讀它，它似乎是有效的。保存圖像有效，但圖像中從不存在任何exif數據。 CGImageDestinationRef myImageDest = CGImageDestinationCreateWithURL((CFURLRef) docurl, kUTTypeJPEG, 1, NULL);
// Add the image to the destination using previously saved options.
CGImageDestinationAddImage(myImageDest, iref, NULL);
//add back exif
NSDictionary *props = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:.1], kCGImageDestinationLossyCompressionQuality,
metadataDict, kCGImagePropertyExifDictionary, //the exif metadata
nil];
//kCGImagePropertyExifAuxDictionary
CGImageDestinationSetProperties(myImageDest, (CFDictionaryRef) props);
// Finalize the image destination.
bool status = CGImageDestinationFinalize(myImageDest);
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滄海一幻覺
TA貢獻1824條經驗 獲得超5個贊
我嘗試了史蒂夫的答案并且它有效，但我認為它對于大型圖像來說很慢，因為它會復制整個圖像。
您可以使用CMSetAttachments直接在CMSampleBuffer上設置屬性。在打電話之前這樣做jpegStillImageNSDataRepresentation
CFDictionaryRef metaDict = CMCopyDictionaryOfAttachments(NULL, imageSampleBuffer, kCMAttachmentMode_ShouldPropagate);
CFMutableDictionaryRef mutable = CFDictionaryCreateMutableCopy(NULL, 0, metaDict);
NSMutableDictionary * mutableGPS = [self getGPSDictionaryForLocation:self.myLocation];
CFDictionarySetValue(mutable, kCGImagePropertyGPSDictionary, mutableGPS);
// set the dictionary back to the buffer
CMSetAttachments(imageSampleBuffer, mutable, kCMAttachmentMode_ShouldPropagate);
方法getGPSDictionaryForLocation：可以在這里找到：
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