Ios 如何跟踪UIImagePickerController创建/选择的媒体？

我正在构建一个iOS应用程序，它允许用户从UIImagePickerController上传视频，可以通过录制或从摄像机卷中选择视频，也可以播放所选视频。我的问题是，我将如何保存以这种方式选择的视频的引用？我想这样做，如果视频仍然存在于设备上，我可以使用本地文件，而不是流式传输上传的文件

什么时候

返回中的URL：

 [info objectForKey:UIImagePickerControllerMediaURL];

格式为：file://localhost/private/var/mobile/Applications/ /tmp//trim.z2vLjx.MOV“

我相信“/tmp/”目录是临时的，因此不适合保存该位置的URL

我可以通过AlassetLibrary获取设备上的所有视频，但因为我没有办法区分它们，这对我没有帮助。我一直在尝试使用：

[result valueForProperty:ALAssetPropertyDate];

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要区分视频，我需要一种从UIImagePickerController获取创建日期的方法，这样才有用。

您可以轻松地在设备上保存视频记录。要么保留一个数据库（我觉得太多了），要么只是一个包含视频列表的文件。在该列表中，您可以拥有资产的URL

我终于找到了解决方案：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];

if(CFStringCompare((CFStringRef) mediaType,  kUTTypeMovie, 0) == kCFCompareEqualTo)
{
    //Dismiss the media picker view
    [picker dismissModalViewControllerAnimated:YES];

    //Get the URL of the chosen content, then get the data from that URL
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    NSData *webData = [NSData dataWithContentsOfURL:videoURL];

    //Gets the path for the URL, to allow it to be saved to the camera roll
    NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum (moviePath))
    {
        ALAssetsLibrary *lib = [[ALAssetsLibrary alloc] init];

        //The key UIImagePickerControllerReferenceURL allows you to get an ALAsset, which then allows you to get metadata (such as the date the media was created)
        [lib assetForURL:[info objectForKey:UIImagePickerControllerReferenceURL] resultBlock:^(ALAsset *asset) {
            NSLog(@"created: %@", [asset valueForProperty:ALAssetPropertyDate]);
        } failureBlock:^(NSError *error) {
            NSLog(@"error: %@", error);
        }];
    }
}

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像往常一样，通过更彻底地阅读文档找到了解决方案。希望这能在某个时候帮助其他人。

或者是内容的MD5汇总，这样你就不会有重复的内容了谢伊，谢谢，我已经想到了，不要认为我的问题措辞很好，我会更新它。

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];

if(CFStringCompare((CFStringRef) mediaType,  kUTTypeMovie, 0) == kCFCompareEqualTo)
{
    //Dismiss the media picker view
    [picker dismissModalViewControllerAnimated:YES];

    //Get the URL of the chosen content, then get the data from that URL
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    NSData *webData = [NSData dataWithContentsOfURL:videoURL];

    //Gets the path for the URL, to allow it to be saved to the camera roll
    NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum (moviePath))
    {
        ALAssetsLibrary *lib = [[ALAssetsLibrary alloc] init];

        //The key UIImagePickerControllerReferenceURL allows you to get an ALAsset, which then allows you to get metadata (such as the date the media was created)
        [lib assetForURL:[info objectForKey:UIImagePickerControllerReferenceURL] resultBlock:^(ALAsset *asset) {
            NSLog(@"created: %@", [asset valueForProperty:ALAssetPropertyDate]);
        } failureBlock:^(NSError *error) {
            NSLog(@"error: %@", error);
        }];
    }
}