iOS UIImagePickerController：有没有办法获取所选图片的日期？

在我的应用程序中，我使用UIImagePickerController调用

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

关于成功。 问题是，我需要照片拍摄的日期。如果用户拍摄了一张新照片，我当然可以拍摄当前日期，但是如果用户从他的相机卷或另一张保存的照片中选择了一张照片，我该怎么办

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

    NSDictionary *metadataDictionary = (NSDictionary *)[info valueForKey:UIImagePickerControllerMediaMetadata];
        // do something with the metadata

    NSLog(@"meta : %@ \n\n",metadataDictionary);
}

然后

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您必须从中获取“DateTime”键的值，您可以将此代码用于从相册中获取的照片和视频info是上述委托方法中的第二个参数

NSURL *mediaUrl = info[UIImagePickerControllerReferenceURL];
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];

[assetsLibrary assetForURL:mediaUrl resultBlock:^(ALAsset *asset) {
    NSDate *date = [asset valueForProperty:ALAssetPropertyDate];
    // ...
} failureBlock:nil];

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同样，要使其正常工作，您需要包括到projectAssetLibrary框架中。

iOS 11+、Swift 4+

import Photos
extension ViewController : UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    public func imagePickerController(_ picker: UIImagePickerController,
                                      didFinishPickingMediaWithInfo info: [String : Any]) {
        if let asset = info[UIImagePickerControllerPHAsset] as? PHAsset,
            let creationDate = asset.creationDate {
            print(creationDate) // Here is the date when your image was taken
        }
        dismiss(animated: true)
    }
}

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不幸的是，根据文档，UIImagePickerController Diametadata仅在iOS4.1中可用，并且仅在有人拍摄新图片时可用，但不适用于库/相册中的图片：（很好，但第1行的输入错误：应该是mediaUrl而不是urlUIImagePickerControllerReferenceURL在iOS 11中不受欢迎UIImagePickerControllerReferenceUrl在iOS 11中不受欢迎