xcode UIImage元数据
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UIImage meta data
提问by shoughton123
In my app I am retrieving a UIImage from the asset library, this image has meta data. The app is then resizing and rotating the image which in turn is creating a new image. The new image does not have the original meta data which is expected but how do I add the meta data back to the image before upload?
在我的应用程序中，我从资产库中检索 UIImage，该图像具有元数据。该应用程序然后调整大小和旋转图像，从而创建一个新图像。新图像没有预期的原始元数据，但如何在上传前将元数据添加回图像？
Thanks in advance!
提前致谢！
回答by shoughton123
Fixed it myself, here is a method I used just incase anyone else is wondering how to do it! :)
自己修复了它，这是我使用的一种方法，以防其他人想知道该怎么做！:)
-(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;
}
