ios - Xcode/ios : How do you get name of image after letting user select one and displaying it?

Question

我有代码可以让用户选择现有图像并让它在屏幕上的 UIView 中很好地显示。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    self.imageView.image = chosenImage;
    NSLog(@"image is%@",chosenImage);
    [picker dismissViewControllerAnimated:YES completion:NULL];
}

如何获取文件名以将其保留以供将来引用？ selectedImage 只是向您显示有关该文件的一堆元数据。

谢谢你。

Answer 1

如下所示，您无法从 UIImagePickerControllerDelegate 中获取所选图像的名称使用当前现有的 API。

这里有 UIImagePickerControllerDelegate 的可用 Editing Information Keys :

NSString *const UIImagePickerControllerMediaType;
NSString *const UIImagePickerControllerOriginalImage;
NSString *const UIImagePickerControllerEditedImage;
NSString *const UIImagePickerControllerCropRect;
NSString *const UIImagePickerControllerMediaURL;
NSString *const UIImagePickerControllerReferenceURL;
NSString *const UIImagePickerControllerMediaMetadata;

但是，您可能想使用 AssetsLibrary.framework 获取由 Photos 应用程序管理的图像的名称:

@import AssetsLibrary;

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    [library assetForURL:info[UIImagePickerControllerReferenceURL] 
             resultBlock:^(ALAsset *fileAsset) {

      NSLog(@"%@", [[fileAsset defaultRepresentation] filename]);

   } failureBlock:nil];
}