将视频URL保存到Core Data

Question

在我的应用程序中,我利用UIImagePickerController来录制视频.然后我将视频URL从相机胶卷保存到核心数据中,每当我想播放它时,我都会拉URL并这样做.但是,当从照片应用中删除视频时,它仍会播放几天.当它没有从照片应用程序中删除时,它仍然会在几天后删除.如何将视频保存到我的应用程序文档中,并将其保存到核心数据中？这是我目前使用的(它不起作用):

这是不起作用的zip文件:http://jmp.sh/v/w4gE5SXNiRd0d7tasc3U

这是现在可以正常工作的zip文件:http://jmp.sh/v/tzyJU3nlc1qOPI9ZzDTF

 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
 NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
 // Handle a movie capture
 if (CFStringCompare((__bridge_retained CFStringRef)mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo) {
 NSString *moviePath = [NSString stringWithFormat:@"%@", [[info objectForKey:UIImagePickerControllerMediaURL] path]];
 NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
 NSData *videoData = [NSData dataWithContentsOfURL:videoURL];

 AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
 _managedObjectContext = [appDelegate managedObjectContext];
 Video *video = [NSEntityDescription insertNewObjectForEntityForName:@"Video" inManagedObjectContext:_managedObjectContext];

 [video setVideoData:videoData];

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *documentsDirectory = [paths objectAtIndex:0];
 int random = arc4random() % 1000;
 //[documentsDirectory stringByAppendingFormat:@"/vid1.mp4"]
 NSString *tempPath = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat:@"vid%d%@%@.mp4", random, self.currentAthlete.first, self.currentAthlete.last]];
 BOOL success = [videoData writeToFile:tempPath atomically:NO];
 if (success == FALSE) {
 NSLog(@"Video was not successfully saved.");
 }
 else{
 [video setVideoURL:[NSString stringWithFormat:@"%@", tempPath]];
 }

 NSError *error = nil;
 if (![_managedObjectContext save:&error]) {
 }

 if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath)) {
 UISaveVideoAtPathToSavedPhotosAlbum(moviePath, self,
 @selector(video:didFinishSavingWithError:contextInfo:), nil);
 }
 }
 [self dismissViewControllerAnimated:YES completion:nil];
 }

Answer 1

核心数据本身.

等等,在你声称不应该直接将大型二进制对象存储到Core Data Store之前,我同意.你不应该.

但是,如果文件很大,Core Data中有一个选项可以使用外部存储来存储二进制数据.

现在,如果文件很大,Core Data将负责保存文件并存储URL.

为您节省管理数据文件的费用.

Answer 2

不要创建这样的路径：

NSString *tempPath = [NSString stringWithFormat:@"%@/vid%d%@%@.mp4", documentsDirectory, random, self.currentAthlete.first, self.currentAthlete.last];

像这样创建：

NSString *tempPath = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat:@"vid%d%@%@.mp4", random, self.currentAthlete.first, self.currentAthlete.last]];