ios - 如何从 UIImagePickerController 将图像保存到应用程序文件夹？

Question

我有一个让我抓狂的问题。我已经搜索了很多来解决它，但我发现的所有答案都是旧的并且没有帮助。

我目前正在开发使用 UIImagePickerControllerDelegate 和 didFinishPickingMediaWithInfo 的应用程序，我想将所选图像保存到应用程序文件夹。

到目前为止，我可以用它来选择图像；

- (IBAction)btnPressed:(UIButton *)sender
{
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
        UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
        imgPicker.delegate = self;
        imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        imgPicker.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeImage];
        imgPicker.allowsEditing = NO;

        [self presentViewController:imgPicker animated:YES completion:nil];
    }

}

但无法使用 didFinishPickingMediaWithInfo 将其保存到应用程序中；

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

    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    [self dismissViewControllerAnimated:YES completion:nil];
    if ([mediaType isEqualToString:(NSString *) kUTTypeImage])
    {
        UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

        //Assigning the selected image to imageView to see on UI side.
        imageViewerImage.image = image;
    }
}

我想知道这一点之后应该是什么部分。

非常感谢您提供的任何帮助。

Answer 1

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

    [self dismissViewControllerAnimated:YES completion:NULL];

UIImage* image;

if([[info valueForKey:@"UIImagePickerControllerMediaType"] isEqualToString:@"public.image"])
    {

  image = [info valueForKey:@"UIImagePickerControllerOriginalImage"];

 NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"New Folder"];

// New Folder is your folder name

 NSError *error = nil;

if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath])
    [[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error];

NSString *fileName = [stringPath stringByAppendingFormat:@"/image.jpg"];

NSData *data = UIImageJPEGRepresentation(image, 1.0);

[data writeToFile:fileName atomically:YES];

   }
}