UIImagePickerController并從現(xiàn)有照片中提取EXIF數(shù)據(jù)眾所周知，UIImagePickerController在選擇后不會返回照片的元數(shù)據(jù)。但是，應(yīng)用程序商店中的一些應(yīng)用程序（Mobile Fotos，PixelPipe）似乎能夠讀取原始文件和存儲在其中的EXIF數(shù)據(jù)，使應(yīng)用程序能夠從所選照片中提取地理數(shù)據(jù)。他們似乎是通過從/ private / var / mobile / Media / DCIM / 100APPLE /文件夾中讀取原始文件并通過EXIF庫運(yùn)行它來完成此操作。但是，我無法找到一種方法來匹配從UIImagePickerController返回的照片到磁盤上的文件。我已經(jīng)探索了文件大小，但原始文件是JPEG，而返回的圖像是原始UIImage，因此無法知道所選圖像的文件大小。我正在考慮制作一個哈希表并匹配每個圖像的前x個像素。雖然這看起來有點(diǎn)過頭了，但可能很慢。有什么建議？
3 回答
長風(fēng)秋雁
TA貢獻(xiàn)1757條經(jīng)驗(yàn) 獲得超7個贊
這適用于iOS5（beta 4）和相機(jī)膠卷（你需要為.h中的塊輸入defs）：
-(void) imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
if ([mediaType isEqualToString:(NSString*)kUTTypeImage]) {
NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];
if (url) {
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset) {
CLLocation *location = [myasset valueForProperty:ALAssetPropertyLocation];
// location contains lat/long, timestamp, etc
// extracting the image is more tricky and 5.x beta ALAssetRepresentation has bugs!
};
ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror) {
NSLog(@"cant get image - %@", [myerror localizedDescription]);
};
ALAssetsLibrary *assetsLib = [[ALAssetsLibrary alloc] init];
[assetsLib assetForURL:url resultBlock:resultblock failureBlock:failureblock];
}}
蕭十郎
TA貢獻(xiàn)1815條經(jīng)驗(yàn) 獲得超13個贊
有一種方法 iOS 8
不使用任何第三方EXIF庫。
#import <Photos/Photos.h>- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithALAssetURLs:@[url] options:nil];
PHAsset *asset = fetchResult.firstObject;
//All you need is
//asset.location.coordinate.latitude
//asset.location.coordinate.longitude
//Other useful properties of PHAsset
//asset.favorite
//asset.modificationDate
//asset.creationDate}添加回答
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