方式一：
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeImageDataToSavedPhotosAlbum:processedJPEG metadata:stillCamera.currentCaptureMetadata completionBlock:^(NSURL *assetURL, NSError *error2)
{
if (error2) {
NSLog(@"ERROR: the image failed to be written");
}
else {
NSLog(@"PHOTO SAVED - assetURL: %@", assetURL);
}
runOnMainQueueWithoutDeadlocking(^{
[photoCaptureButton setEnabled:YES];
});
}];
currentCaptureMetadata 里带上GPS信息
方式二：
NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:imageName], 1);
CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)imageData, NULL);
NSDictionary *imageInfo = (__bridge NSDictionary*)CGImageSourceCopyPropertiesAtIndex(source, 0, NULL);
NSLog(@"%@",imageInfo);
NSMutableDictionary *metaDataDic = [imageInfo mutableCopy];
NSMutableDictionary *exifDic = [[metaDataDic objectForKey:(NSString*)kCGImagePropertyExifDictionary] mutableCopy];
NSMutableDictionary *GPSDic = [[metaDataDic objectForKey:(NSString*)kCGImagePropertyGPSDictionary]mutableCopy];
NSLog(@"%@",exifDic);
NSLog(@"%@",GPSDic);
if (GPSDic == nil) {
GPSDic = [NSMutableDictionary dictionaryWithCapacity:0];
}
[GPSDic setObject:@"N" forKey:(NSString*)kCGImagePropertyGPSLatitudeRef];
[GPSDic setObject:[NSNumber numberWithFloat:116.29353] forKey:(NSString*)kCGImagePropertyGPSLatitude];
NSLog(@"%@",GPSDic);
[metaDataDic setObject:GPSDic forKey:(NSString*)kCGImagePropertyGPSDictionary];
CFStringRef UTI = CGImageSourceGetType(source);
NSMutableData *newImageData = [NSMutableData data];
CGImageDestinationRef destination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)newImageData, UTI, 1,NULL);
//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)metaDataDic);
CGImageDestinationFinalize(destination);
NSString *directoryDocuments = NSTemporaryDirectory();
[newImageData writeToFile: directoryDocuments atomically:YES];
CIImage *testImage = [CIImage imageWithData:newImageData];
NSDictionary *propDict = [testImage properties];
NSLog(@"Properties %@", propDict);