如何在物鏡c中獲取照片創建日期

Question

我正在嘗試從iPhone的圖片庫中選擇圖片時獲取圖片拍攝日期。 我正在使用下面的代碼來做同樣的事情。

NSDictionary* fileAttribs = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
NSDate *result = [fileAttribs fileCreationDate]; //or fileModificationDate

但它顯示的是當前日期和時間。

從照片庫中選擇圖片時，有什么方法可以獲取拍攝日期。

Answer 1

您可以使用ALAsset檢查圖片的元數據

查找密鑰ALAssetPropertyDate

編輯，完整代碼：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    NSURL *url = [info objectForKey:@"UIImagePickerControllerReferenceURL"];

    ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];
    [assetslibrary assetForURL:url
                   resultBlock:^(ALAsset *asset) {
                       NSDate *myDate = [asset valueForProperty:ALAssetPropertyDate];
                       NSLog(@"Date: %@", myDate);
                   } failureBlock:^(NSError *error) {
                       NSLog(@"Error");
                   }];

    [picker dismissViewControllerAnimated:YES completion:nil];

}

Answer 2

已棄用ALAssetsLibrary，因此使用PHAsset：

#import <Photos/PHAsset.h> 

然后：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

        NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];
        PHAsset *phAsset = [[PHAsset fetchAssetsWithALAssetURLs:@[imageURL] options:nil] lastObject];
        NSDate *date = [phAsset creationDate];
        UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];

}