在保存到照片卷之前为视频文件指定特定名称-iOS

我正在开发一个iOS应用程序，最近我在一个popover中实现了一个imagePicker，允许用户录制照片和视频。我想把它们存储在iPad的照片卷中，这样用户以后可以在iTunes中同步它们。我已经能够成功地做到这一点，但我想给每张照片和视频一个唯一的名称，其中包含有关照片和视频的有用信息，以便我以后可以加载它们。具体地说，我想使用类的属性live\u-trial\u-id作为文件名来存储照片。下面是我当前用于将照片和视频存储到照片卷的代码。我知道我可以用图片的元数据来实现这一点，但对于视频，我迷失了方向。提前感谢您对此问题的帮助

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

NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
UIImage *originalImage, *editedImage, *imageToSave;

// Handle a still image capture
if( [mediaType isEqualToString:@"public.image"]){

    editedImage = (UIImage *) [info objectForKey:
                               UIImagePickerControllerEditedImage];
    originalImage = (UIImage *) [info objectForKey:
                                 UIImagePickerControllerOriginalImage];

    if (editedImage) {
        imageToSave = editedImage;
    } else {
        imageToSave = originalImage;
    }

    // Get the image metadata
    UIImagePickerControllerSourceType pickerType = picker.sourceType;
    if(pickerType == UIImagePickerControllerSourceTypeCamera)
    {
        NSDictionary *imageMetadata = [info objectForKey:
                                       UIImagePickerControllerMediaMetadata];
        // Get the assets library
        ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
        ALAssetsLibraryWriteImageCompletionBlock imageWriteCompletionBlock =
        ^(NSURL *newURL, NSError *error) {
            if (error) {
                NSLog( @"Error writing image with metadata to Photo Library: %@", error );
            } else {
                NSLog( @"Wrote image with metadata to Photo Library");
            }
        };

        // Save the new image (original or edited) to the Camera Roll
        [library writeImageToSavedPhotosAlbum:[imageToSave CGImage]
                                     metadata:imageMetadata
                              completionBlock:imageWriteCompletionBlock];
    }
}

if ([mediaType isEqualToString:@"public.movie"]) {
    UIImagePickerControllerSourceType pickerType = picker.sourceType;
    if(pickerType == UIImagePickerControllerSourceTypeCamera)
    {
        NSURL *mediaURL = [info objectForKey:UIImagePickerControllerMediaURL];
        // Get the assets library
        ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
        ALAssetsLibraryWriteVideoCompletionBlock videoWriteCompletionBlock =
        ^(NSURL *newURL, NSError *error) {
            if (error) {
                NSLog( @"Error writing image with metadata to Photo Library: %@", error );
            } else {
                NSLog( @"Wrote image with metadata to Photo Library");
            }
        };

        // Save the new image (original or edited) to the Camera Roll
        [library writeVideoAtPathToSavedPhotosAlbum:mediaURL
                              completionBlock:videoWriteCompletionBlock];

    }
}

---

我还希望尽可能避免创建自定义库或自定义元数据。我真的只是想在上传照片的过程中更改文件名，结果我回答了自己的问题。我想做的是保存到应用程序的文档目录，而不是照片卷。这使我能够访问已保存的文件，并在以后连接时将其同步到计算机

我最后回答了自己的问题。我想做的是保存到应用程序的文档目录，而不是照片卷。这使我能够访问已保存的文件，并在以后连接时将其同步到计算机

感谢您的代码帮助我识别正在捕获的视频或图像；-）感谢您的代码帮助我识别正在捕获的视频或图像；-）